This document provides details about a course work project on solar air heaters. It includes:
- An introduction describing solar air heaters and opportunities to improve their efficiency.
- A literature review summarizing previous studies on enhancing heat transfer using different absorber plate geometries.
- The identification of a research gap in three-sided artificial roughening of absorber plates to further increase efficiency.
- The objectives of experimentally comparing the heat transfer and pressure drop of one-sided and three-sided roughened absorber plates.
- An overview of the work completed so far, including design, experimentation, data analysis, and initial research publications.
Effect of artificial roughness on Thermal and Thermohydraulic efficiency in R...IJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
International Journal of Modern Engineering Research (IJMER) covers all the fields of engineering and science: Electrical Engineering, Mechanical Engineering, Civil Engineering, Chemical Engineering, Computer Engineering, Agricultural Engineering, Aerospace Engineering, Thermodynamics, Structural Engineering, Control Engineering, Robotics, Mechatronics, Fluid Mechanics, Nanotechnology, Simulators, Web-based Learning, Remote Laboratories, Engineering Design Methods, Education Research, Students' Satisfaction and Motivation, Global Projects, and Assessment…. And many more.
ARTICLE 58 IJAET VOLII ISSUE III JULY SEPT 2011Nirav Soni
The document reports on an experimental investigation of a double pass solar air heater with a corrugated absorber plate and Amul Cool aluminum cans. The study found that using a corrugated plate and aluminum cans in the double pass design increased the absorber plate temperature and thermal efficiency compared to a conventional single pass solar air heater. Tests were conducted to analyze how factors like time of day, solar insolation, and mass flow rate affected the absorber temperature and thermal efficiency of the modified solar air heater design.
A Detailed Review on Artificial Roughness Geometries for Optimizing Thermo-Hy...IJMER
It is well known fact that the heat transfer coefficient between the absorber surface of solar air collector & flowing fluid i.e. air can be improved by providing artificial roughness geometry on heat transfer surface (absorber surface).In this way the Thermal efficiency is increased. But at the same time due to roughness geometry pumping power of solar air collector in increased due to fictional losses in duct. So it necessary to examine the shape, size & flow pattern of various roughness elements to get maximum efficiency with minimum frictional losses. Therefore the selection of roughness geometry has to be based on the parameter that takes into account both Thermal & Hydraulic (friction) performance i.e. Thermo-hydraulic Performance of Solar air collector. Number of roughness elements has been investigated on heat transfer & friction characteristics of solar air collectors. In this paper, reviews of various artificial roughness elements used as passive heat transfer techniques, in order to improve Thermo-hydraulic performance of solar air collectors is reviewed & presented. Correlations developed by various researchers with the help of experimental results for heat transfer & friction factor for solar air collector by taking different roughness geometries are given & these correlations are useful to predict the Thermo-hydraulic performance of solar air collector having roughened ducts. The objective of this paper is also the awareness of effect of various types’ roughness geometries on heat
A Review on Comparative Study of Thermal Performance of Artificially Roughene...IRJAES
This document reviews research on enhancing heat transfer in solar air heaters through the use of artificial surface roughness. It summarizes findings from several studies that have experimentally analyzed heat transfer performance for different roughness configurations and geometries. The highest average Nusselt numbers were found for a multi V-rib roughness configuration experimentally, while analytical models predicted higher values for end-of-side roughened collectors. A roughness Reynolds number of around 24 was found to give optimal thermal-hydraulic performance across a range of studies.
Effect of artificial roughness on heat transfer and friction factor charIAEME Publication
1) The study examines the effect of adding transverse ribs to the absorber plate of a double pass solar air heater on heat transfer and friction factor characteristics.
2) Maximum heat transfer and friction factor occurred at a relative roughness pitch of 10, with heat transfer enhanced 1.6 times over a smooth plate.
3) Artificial roughness is used to increase turbulence and break the laminar sub-layer on the absorber plate, improving heat transfer and thermal efficiency.
STUDY OF HEAT TRANSFER ON BROKEN ARC ROUGHNESS ELEMENTS ON THE ABSORBER PLATE...IAEME Publication
Performance of solar air heater can be enhanced by adding roughness to the inner periphery. The present study on the effect of various shape parameters for broken arc roughness elements of heat transfer and friction factor characteristics of rectangular duct. The duct has Reynolds number (Re) range of 3000-22300, respective roughness height (e/D) values is 0.045, arc angle (α) is 60˚ and roughness width (W/w) is 5 and relatively roughness pitch is 8.
THERMAL PERFORMANCE TESTING OF A FLAT PLATE SOLAR AIR HEATER USING OPTICAL ME...ijmech
Experimental test set up at laboratory scale has been developed for thermal performance testing of flat
plate solar air heater with simulated solar radiation intensity; 600W/m2. A test cell of size 1m x 0.5m x
0.1m was fabricated. Three designs namely (i) plane absorber (ii) transverse V- porous ribs and (iii)
inclined V-porous ribs of absorber are tested. All the experiments are conducted with artificial solar
radiation and in natural convection. Performances of these three designs have been compared on the basis
of overall thermal efficiency and thermal gradient along normal to the base. Thermal gradient has been
determined by laser beam deviation method. PT-100 temperature sensors have also been used to validate
the optical results of thermal gradient. The overall thermal efficiencies of these designs have been found as
14.91%, 17.24% and 20.04% respectively. It has also been seen that thermal gradient tends to reduce with
increase in efficiency.
Experimental Investigation of Heat Transfer through Rectangular and Trapezoid...IRJET Journal
The document describes an experimental investigation of heat transfer through rectangular and trapezoidal fins made of aluminum 6063 alloy. Rectangular and trapezoidal fins were fabricated from the alloy and experiments were conducted under steady state conditions. Local temperature, heat flux, heat transfer coefficients, and Reynolds numbers were estimated. The findings showed that forced convection was more effective than free convection, and the trapezoidal fin enhanced heat transfer by up to 48% compared to the rectangular fin under different heat supply conditions. The document provides details on the experimental setup, material properties of the aluminum 6063 alloy, and methodology for collecting temperature readings along the fins.
Effect of artificial roughness on Thermal and Thermohydraulic efficiency in R...IJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
International Journal of Modern Engineering Research (IJMER) covers all the fields of engineering and science: Electrical Engineering, Mechanical Engineering, Civil Engineering, Chemical Engineering, Computer Engineering, Agricultural Engineering, Aerospace Engineering, Thermodynamics, Structural Engineering, Control Engineering, Robotics, Mechatronics, Fluid Mechanics, Nanotechnology, Simulators, Web-based Learning, Remote Laboratories, Engineering Design Methods, Education Research, Students' Satisfaction and Motivation, Global Projects, and Assessment…. And many more.
ARTICLE 58 IJAET VOLII ISSUE III JULY SEPT 2011Nirav Soni
The document reports on an experimental investigation of a double pass solar air heater with a corrugated absorber plate and Amul Cool aluminum cans. The study found that using a corrugated plate and aluminum cans in the double pass design increased the absorber plate temperature and thermal efficiency compared to a conventional single pass solar air heater. Tests were conducted to analyze how factors like time of day, solar insolation, and mass flow rate affected the absorber temperature and thermal efficiency of the modified solar air heater design.
A Detailed Review on Artificial Roughness Geometries for Optimizing Thermo-Hy...IJMER
It is well known fact that the heat transfer coefficient between the absorber surface of solar air collector & flowing fluid i.e. air can be improved by providing artificial roughness geometry on heat transfer surface (absorber surface).In this way the Thermal efficiency is increased. But at the same time due to roughness geometry pumping power of solar air collector in increased due to fictional losses in duct. So it necessary to examine the shape, size & flow pattern of various roughness elements to get maximum efficiency with minimum frictional losses. Therefore the selection of roughness geometry has to be based on the parameter that takes into account both Thermal & Hydraulic (friction) performance i.e. Thermo-hydraulic Performance of Solar air collector. Number of roughness elements has been investigated on heat transfer & friction characteristics of solar air collectors. In this paper, reviews of various artificial roughness elements used as passive heat transfer techniques, in order to improve Thermo-hydraulic performance of solar air collectors is reviewed & presented. Correlations developed by various researchers with the help of experimental results for heat transfer & friction factor for solar air collector by taking different roughness geometries are given & these correlations are useful to predict the Thermo-hydraulic performance of solar air collector having roughened ducts. The objective of this paper is also the awareness of effect of various types’ roughness geometries on heat
A Review on Comparative Study of Thermal Performance of Artificially Roughene...IRJAES
This document reviews research on enhancing heat transfer in solar air heaters through the use of artificial surface roughness. It summarizes findings from several studies that have experimentally analyzed heat transfer performance for different roughness configurations and geometries. The highest average Nusselt numbers were found for a multi V-rib roughness configuration experimentally, while analytical models predicted higher values for end-of-side roughened collectors. A roughness Reynolds number of around 24 was found to give optimal thermal-hydraulic performance across a range of studies.
Effect of artificial roughness on heat transfer and friction factor charIAEME Publication
1) The study examines the effect of adding transverse ribs to the absorber plate of a double pass solar air heater on heat transfer and friction factor characteristics.
2) Maximum heat transfer and friction factor occurred at a relative roughness pitch of 10, with heat transfer enhanced 1.6 times over a smooth plate.
3) Artificial roughness is used to increase turbulence and break the laminar sub-layer on the absorber plate, improving heat transfer and thermal efficiency.
STUDY OF HEAT TRANSFER ON BROKEN ARC ROUGHNESS ELEMENTS ON THE ABSORBER PLATE...IAEME Publication
Performance of solar air heater can be enhanced by adding roughness to the inner periphery. The present study on the effect of various shape parameters for broken arc roughness elements of heat transfer and friction factor characteristics of rectangular duct. The duct has Reynolds number (Re) range of 3000-22300, respective roughness height (e/D) values is 0.045, arc angle (α) is 60˚ and roughness width (W/w) is 5 and relatively roughness pitch is 8.
THERMAL PERFORMANCE TESTING OF A FLAT PLATE SOLAR AIR HEATER USING OPTICAL ME...ijmech
Experimental test set up at laboratory scale has been developed for thermal performance testing of flat
plate solar air heater with simulated solar radiation intensity; 600W/m2. A test cell of size 1m x 0.5m x
0.1m was fabricated. Three designs namely (i) plane absorber (ii) transverse V- porous ribs and (iii)
inclined V-porous ribs of absorber are tested. All the experiments are conducted with artificial solar
radiation and in natural convection. Performances of these three designs have been compared on the basis
of overall thermal efficiency and thermal gradient along normal to the base. Thermal gradient has been
determined by laser beam deviation method. PT-100 temperature sensors have also been used to validate
the optical results of thermal gradient. The overall thermal efficiencies of these designs have been found as
14.91%, 17.24% and 20.04% respectively. It has also been seen that thermal gradient tends to reduce with
increase in efficiency.
Experimental Investigation of Heat Transfer through Rectangular and Trapezoid...IRJET Journal
The document describes an experimental investigation of heat transfer through rectangular and trapezoidal fins made of aluminum 6063 alloy. Rectangular and trapezoidal fins were fabricated from the alloy and experiments were conducted under steady state conditions. Local temperature, heat flux, heat transfer coefficients, and Reynolds numbers were estimated. The findings showed that forced convection was more effective than free convection, and the trapezoidal fin enhanced heat transfer by up to 48% compared to the rectangular fin under different heat supply conditions. The document provides details on the experimental setup, material properties of the aluminum 6063 alloy, and methodology for collecting temperature readings along the fins.
CFD Analysis of Double Pass Foldable Cum Portable Solar Air HeaterIRJET Journal
1) A computational fluid dynamics (CFD) analysis was performed on a double pass, foldable and portable solar air heater to analyze parameters like outlet air temperature, velocity, and absorber plate temperatures.
2) The CFD model was created in ANSYS Fluent and the RNG k-ε turbulence model with discrete transfer radiation model was used. Material properties were defined and boundary conditions were applied based on experimental conditions.
3) Simulation results from 1-5pm showed a maximum outlet temperature of 56.08°C at 2pm and maximum temperature rise of 16.25°C at 3pm, with outlet velocities around 1.2 m/s. Results agreed well with experimental values.
“International Journal on Emerging Technologies” (ISSN NO. Online: 2249-3255) a peer-reviewed and free open access journal, aims to provide the complete and reliable source of information on current developments in the fields of all sciences. The emphasis will be on publishing quality articles rapidly and openly available to researchers worldwide. Manuscripts submitted to “International Journal on Emerging Technologies” must be original work that has not been published or under consideration for publication elsewhere. All submissions must be written in English. Manuscripts should be typed double space on A4 size paper using font size 12 and preferably not more than 30 pages in length inclusive of tables, figures and illustrations. All submissions will be peer reviewed. The scope of “International Journal on Emerging Technologies” covers all aspects of Electrical, Electronics, Computer IT, Instrumentation, Mechanical, Civil engineering, Physics, Chemistry, Mathematics, Environmental Sciences and Agriculture Sciences, “International Journal on Emerging Technologies” is biannual journal. Papers solicited for “International Journal on Emerging Technologies” can be in the form of survey/tutorial, regular papers, brief papers, case studied and technical correspondence. This journal provides a national and international forum for rapid publication of work describing theoretical as well as practical aspects.
Performance evaluations of two pass solar air heater using 60â° inclinedv-sh...inventionjournals
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
Analysis of Heat Generation in Double Pipe Heat Exchanger: An Experimental Ev...IRJET Journal
This document summarizes research on analyzing heat generation in a double pipe heat exchanger with an elliptical fin surface contact. An experiment was conducted to compare the heat transfer rate of an elliptical fin to other fin types (tube-tube, rectangular, annular, spiral rod). The results showed the elliptical fin had a higher heat transfer rate. The document reviews several other studies analyzing different fin geometries, heat transfer optimization techniques, and computational fluid dynamics simulations of heat exchangers. It provides background on analyzing heat exchangers using methods like logarithmic mean temperature difference and effectiveness-NTU and discusses prior work optimizing dimensions, materials, and flow conditions to improve heat transfer performance.
This document summarizes a study on improving the thermal performance of a solar air heater (SAH) using computational fluid dynamics (CFD) simulation. Rectangular fins were placed on the absorber plate of the SAH to increase surface area. CFD simulations were conducted using ANSYS on a conventional SAH and one with fins. Results showed outlet air temperature was increased by 3% and efficiency improved with the addition of fins. The study aims to enhance heat transfer and efficiency of SAHs through surface modification of the absorber plate.
Performance of solar air heater system using different shapes of turbulators ...IJECSJournal
This paper presents a performance analysis of three types of turbulators i.e V-shaped, Square shaped and Transverse wedge shaped turbulator on absorber plate of solar air heater system and are compared with flat plate collector. Effects of different turbulators on absorber plate of solar collector are studied and results are found out. The performance of turbulator used in this experimentation is evaluated in terms of heat transfer, Reynolds number, Nusselt number, Friction factor etc. The results shows that transverse wedge shaped turbulator have remarkable heat transfer enhancement and high Reynolds number as well as Nusselt number. It is also observed that heat transfer from transverse wedge shaped rib is more than that of flat plate collector.
Assessment of Performance Characteristic of Solar Air Heater with Assorted Ge...IJERA Editor
Artificial roughness is an efficient way for increasing the heat transfer rate in solar air heater with the
corresponding improvement in its thermal performance. A viscous sub-layer is responsible for the low heat
transfer coefficient between absorber plate and flowing air. Repeated ribs in form of artificial roughness are an
effective way to increase the heat transfer rate and improving the performance of solar air heater. Artificial
roughness of the absorber plate is much economical and effective way to improve the thermal performance of
solar air heater. Several investigators have done various investigations to improve heat transfer coefficient with
little penalty of friction factor. They have also developed different correlation for heat transfer coefficient and
friction factor. The correlations developed for heat transfer and friction factor by various investigators have been
reviewed and presented.
Assessment of Performance Characteristic of Solar Air Heater with Assorted Ge...IJERA Editor
Artificial roughness is an efficient way for increasing the heat transfer rate in solar air heater with the
corresponding improvement in its thermal performance. A viscous sub-layer is responsible for the low heat
transfer coefficient between absorber plate and flowing air. Repeated ribs in form of artificial roughness are an
effective way to increase the heat transfer rate and improving the performance of solar air heater. Artificial
roughness of the absorber plate is much economical and effective way to improve the thermal performance of
solar air heater. Several investigators have done various investigations to improve heat transfer coefficient with
little penalty of friction factor. They have also developed different correlation for heat transfer coefficient and
friction factor. The correlations developed for heat transfer and friction factor by various investigators have been
reviewed and presented.
This document summarizes a study on improving the cooling efficiency of fins in a two-stage reciprocating compressor through finite element analysis and dimensional modification. The existing annular fins are made of aluminum alloy. A finite element model of the fins is created in ANSYS to analyze temperature distribution over time under natural convection conditions. The results show the fins reach room temperature in 30 minutes. The fins are then modified by increasing the number of fins from 11 to 13. Finite element analysis of the modified fins shows cooling time is reduced to 22 minutes. In conclusion, modifying the fin geometry through additional fins improves the cooling rate of the reciprocating compressor.
This document summarizes an experimental study on heat transfer enhancement from surface roughness at laminar flow. Specifically, it examines using circular and oval dimples on an aluminum plate to increase heat transfer from the plate to air flowing over it at Reynolds numbers from 600 to 2000. The study finds that both circular and oval dimples enhance heat transfer compared to a flat plate, while maintaining equivalent or lower pressure drops. The experimental results are validated by comparing the measured Nusselt numbers to theoretical values for a plain vertical plate under laminar flow conditions. In general, the dimpled surfaces increase thermal performance without significantly increasing pressure drops compared to a smooth surface.
Analysis of Natural Convention Heat Transfer Enhancement in Finned Tube Heat ...journal ijrtem
ABSTRACT: Most of the engineering problems require high performance heat transfer components with progressively less weight, volumes, accommodating shapes and costs. Air cooled heat exchangers are subjected to air on outer side of heat exchanger surface on in heat recovery systems like economizers gases are subjected on one side of tube surface. On air or gas side heat transfer coefficient is less. Extended surface (fins) are one of the next exchanging devices that are employed extensively to increase heat transfer rates from tubular heat exchangers. The rate of heat transfer depends on the surface area of fin available for exchanging the heat transfer rate from the primary surface of cylindrical shape. Present study focuses on enhancement of heat transfer by using both circular and elliptical type of fins. The present paper attempts to examine trend of heat transfer coefficient experimentally and by using CFD software for various types of elliptical fins with i) varying elliptical ratio, ii) changing orientation of mounting of heat exchanger tube with elliptical fins, iii) varying spacing or fin density. KEY WORDS: Natural convection, Heat transfer enhancements, Elliptical fin, Fin orientation, Fin density.
Solar air heater : Thermal performance analysis.pptxPrashant18538
Solar air heaters are one of the important devices to utilize solar energy. It is an important device to convert solar energy into heat energy economically.
REVIEW PAPER- ON ENHANCEMENT OF HEAT TRANSFER USING RIBSIaetsd Iaetsd
This document reviews research on enhancing heat transfer using ribs mounted inside ducts. Various studies investigated ribs of different shapes, pitches, heights and angles. Continuous ribs, transverse ribs, angled ribs, and other rib configurations were examined. Most studies found that ribs increased turbulence and heat transfer compared to smooth ducts. Some key findings included V-shaped ribs providing better performance than other shapes, and certain rib pitches and angles performing better depending on parameters like Reynolds number. In general, ribs were found to effectively enhance heat transfer through boundary layer disruption and increased turbulence compared to smooth ducts.
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
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This document summarizes an experimental investigation into the effects of trailing edge discharge cooling on the film cooling effectiveness of a turbine nozzle guide vane endwall. The study uses pressure sensitive paint to measure film cooling effectiveness on an endwall downstream of turbine blade trailing edges with discharge holes at compound angles. It examines the interaction between coolant from the endwall and trailing edge, referred to as "phantom cooling", and how blowing ratio and compound angle configuration affect film cooling performance. The experiments were conducted on a scale model turbine nozzle guide vane cascade with Reynolds number of 3.5×105 and inlet Mach number of 0.1 while varying the blowing ratio from 0.7 to 1.3 and compound angle of the trailing edge holes.
This document summarizes an experimental study on heat transfer augmentation from surfaces with dimples. Six steel plates with varying dimple densities and arrangements were tested to analyze heat transfer and pressure drop characteristics. Temperature and pressure measurements were taken under varying air flow rates and heat inputs. It was found that heat transfer, as indicated by Nusselt number, increased with increasing dimple density. Staggered dimple arrangements provided greater enhancement than inline arrangements. Mathematical equations are provided for modeling heat transfer rate, Reynolds number, Nusselt number, and friction factor. Results showed that plates with 50 dimples had the highest average heat transfer coefficient and Nusselt number across all test conditions.
This document summarizes an experimental study on heat transfer augmentation from dimpled surfaces. Six test plates with varying dimple densities were used to study the heat transfer characteristics and pressure drop. It was found that the Nusselt number, a measure of heat transfer, increases with increasing dimple density. Staggered dimple arrangements produced greater increases in heat transfer than inline arrangements. The results show that dimpled surfaces can enhance heat transfer with only a small increase in pressure drop, making them useful for applications like compact heat exchangers.
This document summarizes an experimental study on heat transfer augmentation from surfaces with dimples. Six steel plates with varying dimple densities and arrangements were tested to analyze heat transfer and pressure drop characteristics. Temperature and pressure measurements were taken under varying air flow rates and heat inputs. It was found that heat transfer, as indicated by Nusselt number, increased with increasing dimple density. Staggered dimple arrangements provided greater enhancement than inline arrangements. Mathematical equations are presented for calculating key parameters like heat transfer coefficient, Reynolds number, and friction factor. Results are discussed and heat transfer is seen to increase with Reynolds number for all plates, with the 50 dimple plate performing best.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Low power architecture of logic gates using adiabatic techniquesnooriasukmaningtyas
The growing significance of portable systems to limit power consumption in ultra-large-scale-integration chips of very high density, has recently led to rapid and inventive progresses in low-power design. The most effective technique is adiabatic logic circuit design in energy-efficient hardware. This paper presents two adiabatic approaches for the design of low power circuits, modified positive feedback adiabatic logic (modified PFAL) and the other is direct current diode based positive feedback adiabatic logic (DC-DB PFAL). Logic gates are the preliminary components in any digital circuit design. By improving the performance of basic gates, one can improvise the whole system performance. In this paper proposed circuit design of the low power architecture of OR/NOR, AND/NAND, and XOR/XNOR gates are presented using the said approaches and their results are analyzed for powerdissipation, delay, power-delay-product and rise time and compared with the other adiabatic techniques along with the conventional complementary metal oxide semiconductor (CMOS) designs reported in the literature. It has been found that the designs with DC-DB PFAL technique outperform with the percentage improvement of 65% for NOR gate and 7% for NAND gate and 34% for XNOR gate over the modified PFAL techniques at 10 MHz respectively.
CFD Analysis of Double Pass Foldable Cum Portable Solar Air HeaterIRJET Journal
1) A computational fluid dynamics (CFD) analysis was performed on a double pass, foldable and portable solar air heater to analyze parameters like outlet air temperature, velocity, and absorber plate temperatures.
2) The CFD model was created in ANSYS Fluent and the RNG k-ε turbulence model with discrete transfer radiation model was used. Material properties were defined and boundary conditions were applied based on experimental conditions.
3) Simulation results from 1-5pm showed a maximum outlet temperature of 56.08°C at 2pm and maximum temperature rise of 16.25°C at 3pm, with outlet velocities around 1.2 m/s. Results agreed well with experimental values.
“International Journal on Emerging Technologies” (ISSN NO. Online: 2249-3255) a peer-reviewed and free open access journal, aims to provide the complete and reliable source of information on current developments in the fields of all sciences. The emphasis will be on publishing quality articles rapidly and openly available to researchers worldwide. Manuscripts submitted to “International Journal on Emerging Technologies” must be original work that has not been published or under consideration for publication elsewhere. All submissions must be written in English. Manuscripts should be typed double space on A4 size paper using font size 12 and preferably not more than 30 pages in length inclusive of tables, figures and illustrations. All submissions will be peer reviewed. The scope of “International Journal on Emerging Technologies” covers all aspects of Electrical, Electronics, Computer IT, Instrumentation, Mechanical, Civil engineering, Physics, Chemistry, Mathematics, Environmental Sciences and Agriculture Sciences, “International Journal on Emerging Technologies” is biannual journal. Papers solicited for “International Journal on Emerging Technologies” can be in the form of survey/tutorial, regular papers, brief papers, case studied and technical correspondence. This journal provides a national and international forum for rapid publication of work describing theoretical as well as practical aspects.
Performance evaluations of two pass solar air heater using 60â° inclinedv-sh...inventionjournals
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
Analysis of Heat Generation in Double Pipe Heat Exchanger: An Experimental Ev...IRJET Journal
This document summarizes research on analyzing heat generation in a double pipe heat exchanger with an elliptical fin surface contact. An experiment was conducted to compare the heat transfer rate of an elliptical fin to other fin types (tube-tube, rectangular, annular, spiral rod). The results showed the elliptical fin had a higher heat transfer rate. The document reviews several other studies analyzing different fin geometries, heat transfer optimization techniques, and computational fluid dynamics simulations of heat exchangers. It provides background on analyzing heat exchangers using methods like logarithmic mean temperature difference and effectiveness-NTU and discusses prior work optimizing dimensions, materials, and flow conditions to improve heat transfer performance.
This document summarizes a study on improving the thermal performance of a solar air heater (SAH) using computational fluid dynamics (CFD) simulation. Rectangular fins were placed on the absorber plate of the SAH to increase surface area. CFD simulations were conducted using ANSYS on a conventional SAH and one with fins. Results showed outlet air temperature was increased by 3% and efficiency improved with the addition of fins. The study aims to enhance heat transfer and efficiency of SAHs through surface modification of the absorber plate.
Performance of solar air heater system using different shapes of turbulators ...IJECSJournal
This paper presents a performance analysis of three types of turbulators i.e V-shaped, Square shaped and Transverse wedge shaped turbulator on absorber plate of solar air heater system and are compared with flat plate collector. Effects of different turbulators on absorber plate of solar collector are studied and results are found out. The performance of turbulator used in this experimentation is evaluated in terms of heat transfer, Reynolds number, Nusselt number, Friction factor etc. The results shows that transverse wedge shaped turbulator have remarkable heat transfer enhancement and high Reynolds number as well as Nusselt number. It is also observed that heat transfer from transverse wedge shaped rib is more than that of flat plate collector.
Assessment of Performance Characteristic of Solar Air Heater with Assorted Ge...IJERA Editor
Artificial roughness is an efficient way for increasing the heat transfer rate in solar air heater with the
corresponding improvement in its thermal performance. A viscous sub-layer is responsible for the low heat
transfer coefficient between absorber plate and flowing air. Repeated ribs in form of artificial roughness are an
effective way to increase the heat transfer rate and improving the performance of solar air heater. Artificial
roughness of the absorber plate is much economical and effective way to improve the thermal performance of
solar air heater. Several investigators have done various investigations to improve heat transfer coefficient with
little penalty of friction factor. They have also developed different correlation for heat transfer coefficient and
friction factor. The correlations developed for heat transfer and friction factor by various investigators have been
reviewed and presented.
Assessment of Performance Characteristic of Solar Air Heater with Assorted Ge...IJERA Editor
Artificial roughness is an efficient way for increasing the heat transfer rate in solar air heater with the
corresponding improvement in its thermal performance. A viscous sub-layer is responsible for the low heat
transfer coefficient between absorber plate and flowing air. Repeated ribs in form of artificial roughness are an
effective way to increase the heat transfer rate and improving the performance of solar air heater. Artificial
roughness of the absorber plate is much economical and effective way to improve the thermal performance of
solar air heater. Several investigators have done various investigations to improve heat transfer coefficient with
little penalty of friction factor. They have also developed different correlation for heat transfer coefficient and
friction factor. The correlations developed for heat transfer and friction factor by various investigators have been
reviewed and presented.
This document summarizes a study on improving the cooling efficiency of fins in a two-stage reciprocating compressor through finite element analysis and dimensional modification. The existing annular fins are made of aluminum alloy. A finite element model of the fins is created in ANSYS to analyze temperature distribution over time under natural convection conditions. The results show the fins reach room temperature in 30 minutes. The fins are then modified by increasing the number of fins from 11 to 13. Finite element analysis of the modified fins shows cooling time is reduced to 22 minutes. In conclusion, modifying the fin geometry through additional fins improves the cooling rate of the reciprocating compressor.
This document summarizes an experimental study on heat transfer enhancement from surface roughness at laminar flow. Specifically, it examines using circular and oval dimples on an aluminum plate to increase heat transfer from the plate to air flowing over it at Reynolds numbers from 600 to 2000. The study finds that both circular and oval dimples enhance heat transfer compared to a flat plate, while maintaining equivalent or lower pressure drops. The experimental results are validated by comparing the measured Nusselt numbers to theoretical values for a plain vertical plate under laminar flow conditions. In general, the dimpled surfaces increase thermal performance without significantly increasing pressure drops compared to a smooth surface.
Analysis of Natural Convention Heat Transfer Enhancement in Finned Tube Heat ...journal ijrtem
ABSTRACT: Most of the engineering problems require high performance heat transfer components with progressively less weight, volumes, accommodating shapes and costs. Air cooled heat exchangers are subjected to air on outer side of heat exchanger surface on in heat recovery systems like economizers gases are subjected on one side of tube surface. On air or gas side heat transfer coefficient is less. Extended surface (fins) are one of the next exchanging devices that are employed extensively to increase heat transfer rates from tubular heat exchangers. The rate of heat transfer depends on the surface area of fin available for exchanging the heat transfer rate from the primary surface of cylindrical shape. Present study focuses on enhancement of heat transfer by using both circular and elliptical type of fins. The present paper attempts to examine trend of heat transfer coefficient experimentally and by using CFD software for various types of elliptical fins with i) varying elliptical ratio, ii) changing orientation of mounting of heat exchanger tube with elliptical fins, iii) varying spacing or fin density. KEY WORDS: Natural convection, Heat transfer enhancements, Elliptical fin, Fin orientation, Fin density.
Solar air heater : Thermal performance analysis.pptxPrashant18538
Solar air heaters are one of the important devices to utilize solar energy. It is an important device to convert solar energy into heat energy economically.
REVIEW PAPER- ON ENHANCEMENT OF HEAT TRANSFER USING RIBSIaetsd Iaetsd
This document reviews research on enhancing heat transfer using ribs mounted inside ducts. Various studies investigated ribs of different shapes, pitches, heights and angles. Continuous ribs, transverse ribs, angled ribs, and other rib configurations were examined. Most studies found that ribs increased turbulence and heat transfer compared to smooth ducts. Some key findings included V-shaped ribs providing better performance than other shapes, and certain rib pitches and angles performing better depending on parameters like Reynolds number. In general, ribs were found to effectively enhance heat transfer through boundary layer disruption and increased turbulence compared to smooth ducts.
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
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This document summarizes an experimental study on heat transfer augmentation from surfaces with dimples. Six steel plates with varying dimple densities and arrangements were tested to analyze heat transfer and pressure drop characteristics. Temperature and pressure measurements were taken under varying air flow rates and heat inputs. It was found that heat transfer, as indicated by Nusselt number, increased with increasing dimple density. Staggered dimple arrangements provided greater enhancement than inline arrangements. Mathematical equations are presented for calculating key parameters like heat transfer coefficient, Reynolds number, and friction factor. Results are discussed and heat transfer is seen to increase with Reynolds number for all plates, with the 50 dimple plate performing best.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
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geopolitical, geostrategic, and geoeconomic variables. Topics including trade, political hegemony, oil
politics, and conventional and nontraditional security are all explored and explained by the researcher.
Using Mackinder's Heartland, Spykman Rimland, and Hegemonic Stability theories, examines China's role
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objectivity. This study analyze primary and secondary research documents critically to elaborate role of
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Using recycled concrete aggregates (RCA) for pavements is crucial to achieving sustainability. Implementing RCA for new pavement can minimize carbon footprint, conserve natural resources, reduce harmful emissions, and lower life cycle costs. Compared to natural aggregate (NA), RCA pavement has fewer comprehensive studies and sustainability assessments.
New techniques for characterising damage in rock slopes.pdf
ppt.pptx
1. Under the Guidance of:
Dr. LALJEE PRASAD
Department of Mechanical Engg.
NIT, Jamshedpur
Presented by:
VIKASH KUMAR
2015RSME004
Department of Mechanical Engg.
NIT, Jamshedpur
2. CONTENTS
Course Work Details
Introduction
Literature review
Research gap
Experimentation And Methodology
Objectives
References
3. COURSE WORK SUBJECTS
(MEG7111) THERMODYNAMICS (completed)
(MEG7112) ENERGY CONVERSION SYSTEM (completed)
(MEG7123) SOLAR THERMAL ENERGY SYSTEM (completed)
(MEG7131) NON CONVENTIONAL ENERGY SYSTEMS(completed)
4. RESULT
S. No. Course Code SUBJECT STATUS GRADE CREDIT
1 MEG 7111 THERMODYNA-
MICS
Completed A 4
2 MEG 7112 ENERGY
CONVERSION
SYSTEM
Completed B 4
3 MEG7123 SOLAR
THERMAL
SYSTEMS
Completed A 4
4 MEG7131 NON
CONVENTIONA
L ENERGY
SYSTEMS
Completed A 4
5. INTRODUCTION
Solar air heaters (SAHs) form the foremost component of solar energy
utilization system. These air heaters absorb the incident solar radiation
and convert it into thermal energy at the absorbing surface and then
transfer this energy to a fluid flowing through the collector.
SAHs are inexpensive and most used collection devices because of their
inherent simplicity.
Enhancement of heat transfer in the solar air heater ducts can be
achieved by several means like using baffles, fins, ribs, dimples,groves
etc.
It has many advantages like low fabrication, installation, and operational
costs, and can be constructed by using cheaper and lesser amount of
material.
However, its efficiency is poor. The lower efficiency of solar air heater is
attributed to poor heat transfer characteristics of air, and also the air
cannot be used as storage fluid due to low thermal capacity.
6. The low efficiency of the SAH can be improved either by increasing
the surface area of the absorber plate or by using certain artificial
geometries on the absorber plate with some adverse effect of more
pumping power required due to increase in frictional loss in ducts
which is needed to be taken care of by using proper, geometrical
parameters and flow conditions.
The researcher always try to optimize the roughness which provide
high heat transfer at low pressure drop penalty.
Sub laminar layer is developed over absorber plate which acts as
thermal resistant to flowing air.
These roughness elements breaks up the boundary layers (also
known as laminar sub-layer)and induces greater turbulency which
results in heat transfer enhancement
This area of research has large opportunity for doing novel work to
achieve the heat transfer enhancement with new geometry with
different parameters.
7. Absorber plate :-
A typical flat-plate collector is a metal box with a glass on top
and a dark coloured absorber plate on the bottom. The bottom
of the collector are usually insulated to minimize the heat
losses.
Absorber plates are made of metal like copper, aluminium, GI
sheets and steel because they are good conductor of heat .
A glass cover around the absorber plate helps in reducing the
convective and radiative losses to the surrounding.
10. Author
and
Year
Type of
System Used
Nature of
work
Outcomes
Liu et al(1984)
SAHs with the absorber
plate roughened by
extended surfaces
Experimental
Found that the pressure drops rapidly when
compared to heat transfer if the height of the
roughened element is extended beyond the laminar
sub layer
Prasad and
Saini (1988)
Fully developed
turbulent flow in a solar
air heater duct
Analytical
Convective heat transfer coefficient between
absorber plate and air in a flat-plate solar air
heater can be enhanced by providing the absorber
plate with artificial roughness
Prasad and
Mullick (1983)
SAHs with protruding
wires in underside of the
absorber plate
Experimental and
Analytical
Found improvement of 9% (from 63% to 72%) in
plate efficiency for Reynolds number of 40,000.
11. Author
and
Year
Type of
System Used
Nature of
work
Outcomes
Gupta et
al(1993)
Effect of transverse wire
roughness on absorber
plate on heat and fluid
flow characteristics in
fully developed
turbulent flow
Experimental
Concluded that the heat transfer increased up to
1.8 times than that of smooth solar air heaters at
α=60˚ and friction factor increases by 2.7 at α=70˚
for the range of parameters investigated
Saini and Saini
(1995)
Fully developed
turbulent flow with
expanded metal
mesh as artificial
roughness element.
Experimental
and analytical
It was found that that the maximum values of
Nusselt number and friction factor occurs at an
angle of attack of 61.9˚ and 72˚. Saini and Saini also
developed the correlation for Nusselt number and
friction factor
Ahn (2001)
Investigated on five
different types of
roughness element in
rectangular duct with
e/D 0.0476,
Experimental and
Analytical
Concluded that the triangular rib has the highest
heat transfer capacity and Nusselt number is higher
in the case of square and triangular ribs when
compared to semicircular ribs. The square ribs have
the highest friction factor
12. Author
and
Year
Type of
System Used
Nature of
work
Outcomes
Chandra et
al.(2003)
Investigated the effect
with varying number of
transverse ribbed walls
with the parameters
Re 10,000–80,000; P/e 8
and e/D 0.0625
Experimental
The maximum increase in the friction factor was
found to be 9.50 with four sided ribbed wall in
comparison with
one ribbed wall of 3.14.
Tanda (2004)
Investigated for heat
transfer coefficient and
friction factor in the
rectangular channel
with
Transverse continuous,
transverse broken and V-
shaped broken ribs
Experimental
Maximum performance of continuous transverse
ribs of 45˚ V-shaped ribs and
60˚ V-shaped ribs at the optimum value of P/e 13.3,
transverse broken ribs with P/e 4 and 8 give the
higher heat transfer augmentation.
Behura et al
(2016)
Novel type of three sides
artificially roughened
and glass covered solar
air heater under fully
developed turbulent flow
conditions.
Experimental and
Analytical
The value of Nusselt number in three sides
artificially roughened solar air heater enhances by
21–78% over one side roughened ones for the range
of parameters investigated. However, the friction
factor increases in the range of 2–38%
13. Author and Year Type of System Used Nature of work Outcomes
Kumar et
al.(2017)
Investigated the effect with V-
pattern dimpled obstacles solar
air passage for a Re range of 5000-
17000, Wc/Wd of 1-6, p/e of 9,
e/Dh of 0.037 and α of 55˚
Experimental
Developed Correlation for Nusselts number and friction
factor .
Gilani (2017)
Performance enhancement of
free convective solar air heater by
pin protrusions on the absorber
Experimental
Pin pitch of 16 mm increased the Nusselts number
the most. The efficiency was increased by 26.5% for
absorber plate with 16 mm pin pitch as compared to flat
smooth plate. The pin height of 4 mm proved to be the best
in enhancing the Nusselts number. A correlation was
developed to predict the Nusselts number for conical pin
protruded plates of dimensional ranges (16 mm < pin pitch
< 48 mm) and (2 mm < pin height < 4 mm) under free
convective flow for staggered arrangement.
Leontiev et al
(2017)
Experimental investigation of
heat transfer and drag on surfaces
coated with dimples of different
shape for the range of Re 20000-
70000. The dimples of six
different shapes were considered,
namely, spherical, oval,
teardrop dimples, spherical
dimples with rounded edges,
turned teardrop dimples, and
dimples obtained by milling a
sphere along a circular arc.
Experimental
The Reynolds number effect on the heat transfer
enhancement, the drag increase, and the heat-hydraulic
efficiency is determined. The average values of the above-
mentioned parameters are presented for all the surfaces
considered.
20. Research gap
Analytical results are available in plenty for heat transfer and friction factor
for one sides artificially roughened solar air heaters.
Provision of artificial roughness of various geometries and orientations on
the absorber plate in solar air heaters have remained limited to only one side
(top side) of the solar air heater duct which results in higher values of heat
transfer and associated pressure drop.
Researchers have proved that increasing the number of roughened surface
results in the increase of heat transfer and friction factor.
By providing roughness to three sides (one bottom and two sides) of the
absorber plate may yield better results than the conventional SAHs.
Plenty of work has been done by providing roughness to the single side of
the absorber plate which resulted in an appreciable increase in heat transfer
and friction factor.
The present work is an effort towards seizing the opportunity that may exist
in any furthermost increase in heat transfer and friction factor by providing
the roughness on three walls of the absorber plate
21. Objectives of Present Work:
With a view that artificial roughness and glass covers, if provided on three sides i.e.
top and sides of the solar air heater duct, could perform even better than those of the
existing one side roughened and glass covered solar air heater. The present work has
been taken up with the following objectives:
1. To develop and calibrate the experimental set-up.
2. To perform experiments under actual outdoor conditions and to obtain data on such
collectors on one side as well as three sides roughened collector
3. To develop correlations for heat transfer and friction factor in three sides concave
dimple shape roughened solar air heater.
4. To see the effect of various parameters on heat transfer, friction factor and thermal
Performance vis-à-vis to compare the values with those of one side roughened and
three sides roughened solar air heater
5. To obtain the thermal and thermohydraulic performance for both one side and three
sides roughened solar air heater and observe the difference.
22. Work Done Till Date
Design and development of solar air heater ducts-
Completed.
Experimentation - Completed
Data Analysis- Completed
Research papers and thesis writing- In progress
23. Data Collected From Experimentation :
Pressure difference across orifice meter
Pressure drop across the duct
Temperature of the absorber plate
Temperature of the air in the duct
Ambient temperature
Intensity of solar radiation
24. Parameters To Be Evaluated:
Reynolds number(Re)
Useful Heat Gain(Qu)
Convective Heat Transfer Coefficient(h)
Nusselts Number(Nu)
Friction Factor(f)
Correlations for ‘Nu and f’ in three sides concave
dimple shape roughened solar air heater
Thermal and Thermohydraulic performance
Collector performance parameters (Plate efficiency
factor, collector heat removal factor)
25. References
•B. N. Prasad and J. S. Saini, 1988. Effect of artificial roughness on heat transfer
and friction factor in a solar air heater, Solar Energy 41 (555-560).
•Solar Engineering of Thermal Processes Fourth Edition by John A. Duffie
(Deceased), Emeritus Professor of Chemical Engineering and William A.
Beckman, Emeritus Professor of Mechanical Engineering
• S.K. Verma, B.N. Prasad, 2000. Investigation for the optimal thermo hydraulic
performance of artificial roughness solar air heaters. Renewable Energy 20 (19-
36).
• B. N. Prasad and J. S. Saini, 2000. Investigation for the optimal thermo
hydraulic performance of artificially roughened solar air heaters. Renewable
Energy 20 (19-36).
•Rajendra Karwa, S.C. Solanki, J.S. Saini, 2001. Thermo-hydraulic performance
of solar air heaters having integral chamfered rib roughness on absorber plates.
•J.L. Bhagoria , J.S. Saini, S.C. Solanki, 2002. Heat transfer coefficient and
friction facto correlations for rectangular solar air heater duct having transverse
wedge shaped rib roughness of the absorber plate.Renewable Energy 25 (341–
369).
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airheating fiat-plate solar collectors. Trans ASME J Sol Energy Eng
1984;106:358–63.
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for drying purposes. Appl Energy 1983;13:83–93.
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roughened ducts with expanded metal mesh as roughness element. Int J Heat
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31 (2017) 56-75.
A. Kumar, M.H. Kim, Thermal hydraulic performance in a solar air heater
channel with multiple V-type perforated baffles, Energies 9 (2016) 564.
J. Park, Y.H. Jo, J.S. Kwak, Heat transfer in rectangular duct with perforated
blockages and dimpled side walls, Int. J. Heat Mass Transf. 97 (2016) 224-
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F. Sangtarash, H. Shokuhmand, Experimental and numerical investigation
of the heat transfer augmentation and pressure drop in simple, dimpled and
perforated dimpled louver fin banks with an in-line or staggered
arrangement, Appl. Therm. Eng. 82 (2015) 194-205.
R. Kumar, A. Kumar, R. Chauhan, M. Sethi, Heat transfer enhancement in
solar air channel with broken multiple V-type baffles, Case Stud. Therm.
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28. Kumar Anil, Kumar Raj, Maithani Rajesh, Chauhan Ranchan, Sethi
Muneesh, Kumari Anita, Kumar Sushil, Kumar Sunil, Correlation
development for Nusselt number and friction factor of a multiple type V-
pattern dimpled obstacles solar air passage, Renewable Energy 109 (2017)
461-479
Chandra PR, Alexander CR, Han JC. Heat transfer and friction behaviors in
rectangular channels with varying number of ribbed walls. Int J Heat Mass
Transf 2003;46:481–95.
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V-shaped broken ribs. Int J Heat Mass Transf 2004;47:229–43.
Prasad, B.N., Behura, K. Arun, Prasad, L., 2014. Fluid flow and heat
transfer analysis for heat transfer enhancement in three sided artificially
roughened solar air heater. Sol. Energy 105, 27–35.
Verma S.K., Prasad B.N., Investigation for the optimal thermohydraulic
performance of artificially roughened solar air heaters, Renewable Energy,
Vol. 20, 9-36, 2000.
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performance of three sides artificially roughened solar air heaters Solar
Energy 130 (2016) 46–59
29. R. Kumar, R. Chauhan, M. Sethi, A. Kumar, Experimental study and
correlation development for Nusselt number and friction factor for
discretized broken V-pattern baffle solar air channel, Exp. Therm. Fluid Sci.
31 (2017) 56-75.
Gilani,S.E., Hussain H. Al-Kayiem, Dereje E. Woldemicheal, Gilani, S.I.
Performance enhancement of free convective solar air heater by pin
protrusions on the absorber, Solar Energy 151 (2017) 173–185
Leontiev, A.I., Kiselev, N.A., Vinogradov, Yu.A., Strongin, M.M., Zditovets,
A.G., Burtsev, S.A., Experimental investigation of heat transfer and drag on
surfaces coated with dimples of different shape, International Journal of
Thermal Sciences 118 (2017) 152-167