The document discusses heat gain through building structures via conduction. It describes how heat is transferred through exterior walls, roofs, windows, and doors due to temperature differences. It explains that the solar radiation absorbed by outside surfaces of walls and roofs increases their temperature above the outside air temperature, which is known as the solar air temperature. The heat gain through walls and roofs can be calculated using the CLTD method, which factors in the surface area, overall U-value, and CLTD value from tables based on location and time of day. Infiltration through doors and windows also contributes to heat gain as outside air flows into the building.
67243 cooling and heating & calculationA.M. ATIQULLAH
This document provides information about an upcoming presentation on cooling and heating load calculation. It lists the objectives of understanding aspects of cooling and heating loads, building surveys, and calculating external and internal loads. It also covers psychrometric charts, solar heat gain calculation, refrigeration plant capacity, and equipment selection. References for several textbooks on refrigeration and air conditioning are provided.
A comparative flow analysis of naca 6409 and naca 4412 aerofoileSAT Publishing House
This document analyzes and compares the flow properties of two airfoil profiles, the NACA 6409 and NACA 4412, using computational fluid dynamics (CFD) modeling in ANSYS. The analysis examines pressure distribution, lift and drag coefficients at varying angles of attack. The NACA 4412 was found to have better lift-to-drag ratio performance and is more efficient for practical applications compared to the NACA 6409.
This document summarizes experiments performed on NACA 4412 airfoils in Cal Poly's low speed wind tunnel. Three experiments were conducted: 1) force balance tests on two finite wings to determine coefficients, 2) pressure measurements on a full-span wing to calculate coefficients, and 3) wake rake tests to determine total drag coefficient. The force balance showed lift coefficient increasing pre-stall and dropping post-stall. Pressure data matched theoretical predictions and a NASA study. Lift was found to increase with angle of attack. The NACA 4412 performed best at low angles of attack, suited for a cruiser aircraft.
Analysis of wings using Airfoil NACA 4412 at different angle of attackIJMER
This document summarizes wind tunnel testing of the NACA 4412 airfoil at different angles of attack. The testing was conducted to analyze lift and drag forces on the airfoil at varying angles. The results found that lift increases with angle of attack until a maximum is reached, after which drag becomes dominant and stall occurs. Graphs and tables presented in the document compare experimental pressure and friction coefficient data from the wind tunnel tests to computational fluid dynamics simulations using different turbulence models. The models were able to accurately predict flow separation locations and other characteristics.
Margarito Guzman led the design of compressed air and vacuum systems for a Hyperloop pod developed by HyperXite at UC Irvine. As lead compressed air engineer, he designed a high pressure air system to provide air for levitation, suspension, and braking. As lead vacuum engineer, he designed a vacuum chamber to test materials and instruments for vacuum compatibility. HyperXite's pod design placed 5th overall and 1st in air-based levitation and among California teams in the SpaceX Hyperloop competition.
Riccardo Da Soghe is an Associate Research Manager at Ergon Research in Italy, specializing in computational fluid dynamics (CFD) simulations of turbomachinery components. He received his PhD in Energy Engineering from the University of Florence, focusing his research on CFD analysis of gas turbine secondary air systems and turbine cooling. Currently, he manages various research projects involving design, characterization, and optimization of gas turbine components using CFD. He also coordinates Ergon Research's numerical activities on several European Commission-funded research programs related to gas turbines.
This master's thesis investigates highly loaded transonic fans through aerodynamic and aeroelastic simulations using ANSYS and ABAQUS. It consists of two parts: the first validates simulation results like modal and stress analysis against experimental data from a NASA technical paper on a two-stage fan. The second part of the thesis, under the FanTip project sponsored by German government agencies, aims to optimize jet engine fan design through aeroelastic simulations verified by wind tunnel tests, applying a traveling wave mode approach to determine flutter using ANSYS CFX and Calculix. Simulation results for the fan, outlet guide vanes, and engine blades are also compared to fan performance curves.
67243 cooling and heating & calculationA.M. ATIQULLAH
This document provides information about an upcoming presentation on cooling and heating load calculation. It lists the objectives of understanding aspects of cooling and heating loads, building surveys, and calculating external and internal loads. It also covers psychrometric charts, solar heat gain calculation, refrigeration plant capacity, and equipment selection. References for several textbooks on refrigeration and air conditioning are provided.
A comparative flow analysis of naca 6409 and naca 4412 aerofoileSAT Publishing House
This document analyzes and compares the flow properties of two airfoil profiles, the NACA 6409 and NACA 4412, using computational fluid dynamics (CFD) modeling in ANSYS. The analysis examines pressure distribution, lift and drag coefficients at varying angles of attack. The NACA 4412 was found to have better lift-to-drag ratio performance and is more efficient for practical applications compared to the NACA 6409.
This document summarizes experiments performed on NACA 4412 airfoils in Cal Poly's low speed wind tunnel. Three experiments were conducted: 1) force balance tests on two finite wings to determine coefficients, 2) pressure measurements on a full-span wing to calculate coefficients, and 3) wake rake tests to determine total drag coefficient. The force balance showed lift coefficient increasing pre-stall and dropping post-stall. Pressure data matched theoretical predictions and a NASA study. Lift was found to increase with angle of attack. The NACA 4412 performed best at low angles of attack, suited for a cruiser aircraft.
Analysis of wings using Airfoil NACA 4412 at different angle of attackIJMER
This document summarizes wind tunnel testing of the NACA 4412 airfoil at different angles of attack. The testing was conducted to analyze lift and drag forces on the airfoil at varying angles. The results found that lift increases with angle of attack until a maximum is reached, after which drag becomes dominant and stall occurs. Graphs and tables presented in the document compare experimental pressure and friction coefficient data from the wind tunnel tests to computational fluid dynamics simulations using different turbulence models. The models were able to accurately predict flow separation locations and other characteristics.
Margarito Guzman led the design of compressed air and vacuum systems for a Hyperloop pod developed by HyperXite at UC Irvine. As lead compressed air engineer, he designed a high pressure air system to provide air for levitation, suspension, and braking. As lead vacuum engineer, he designed a vacuum chamber to test materials and instruments for vacuum compatibility. HyperXite's pod design placed 5th overall and 1st in air-based levitation and among California teams in the SpaceX Hyperloop competition.
Riccardo Da Soghe is an Associate Research Manager at Ergon Research in Italy, specializing in computational fluid dynamics (CFD) simulations of turbomachinery components. He received his PhD in Energy Engineering from the University of Florence, focusing his research on CFD analysis of gas turbine secondary air systems and turbine cooling. Currently, he manages various research projects involving design, characterization, and optimization of gas turbine components using CFD. He also coordinates Ergon Research's numerical activities on several European Commission-funded research programs related to gas turbines.
This master's thesis investigates highly loaded transonic fans through aerodynamic and aeroelastic simulations using ANSYS and ABAQUS. It consists of two parts: the first validates simulation results like modal and stress analysis against experimental data from a NASA technical paper on a two-stage fan. The second part of the thesis, under the FanTip project sponsored by German government agencies, aims to optimize jet engine fan design through aeroelastic simulations verified by wind tunnel tests, applying a traveling wave mode approach to determine flutter using ANSYS CFX and Calculix. Simulation results for the fan, outlet guide vanes, and engine blades are also compared to fan performance curves.
67243 cooling and heating load calculationA.M. ATIQULLAH
বিষয় কোডঃ ৬৭২৪৩
বিষয়ঃ কুলিং অ্যান্ড হিটিং লোড ক্যালকুলেশন
অধ্যায়ঃ- ৪ (বিল্ডিং সার্ভের মাধ্যমে শীতাতপ নিয়ন্ত্রণ ব্যবস্থার হিট লোড নির্ণ্য়)
উপস্থাপনায়ঃ
আবু মোহাম্মদ আতিকুল্যা
ইন্সট্রাক্টর (টেক্) আর এসি
ঢাকা পলিটেকনিক ইন্সটিটিউট,
তেজগাঁও,ঢাকা-১২০৮।
Subject Code: 67243
Subject: Cooling And Heating Load Calculation
Chapter: 04 (Understand the Building Survey for Air Conditioning Heat Load)
Presented By: A.M.ATIQULLAH.
Instructor(Tech) RAC
Dhaka Polytechnic Institute,
Tejgaon,Dhaka-1208.
67243 cooling and heating & calculationA.M. ATIQULLAH
1. The document discusses building survey for air conditioning heat load calculation. It explains that a building survey needs to be conducted to understand the various heat sources in the building in order to accurately estimate the heat load.
2. Physical factors that need to be considered during the survey include heat from lights, fans, people, plugs and sockets. Ventilation heat, outside air temperature, and wall/roof heat transmission should also be accounted for.
3. Standard charts and tables from organizations like ASHRAE, ARI and Carrier provide data on ventilation heat, outside air heat, and heat from common building elements to simplify heat load calculations.
67243- cooling and heating & calculationA.M. ATIQULLAH
The document discusses cooling and heating load calculation. It lists the components of total cooling load for air conditioning such as building structure, internal loads, people load, air change load, and supplementary load. A safety factor of 5-10% is usually added to the total cooling load to account for inaccuracies. The meaning of plant capacity is explained as the capacity required to meet the total calculated cooling load while running the refrigeration or air conditioning system continuously for 24 hours. Procedures for calculating the cooling and heating loads and refrigeration plant capacity are also described.
Modeling and performance evaluation of energy efficient buildings envelope us...Editor IJMTER
In the present study, the extended concept of exergy analysis has been applied to a building located in
New Delhi with a volume of 60 m3 and having a single-glazed window on the south facing wall .With this study
thermal energy and thermal exergy flow were investigated to calculate the total thermal energy and exergy in
and out from the building. This allows performing a complex exergy analysis of the building in both heating
and cooling cases. The calculations were carried out by using the developed mathematical model of building
and measured solar radiation data on horizontal and vertical wall surface. The thermal energy and thermal
exergy flows for a space of a typical residential building of natural ventilation system with different parametric
changes (i.e. wall thickness, roof thickness, window material properties, window dimensions, wall material
thermal conductivity ) have been modelled and compared from the reference case .
Finite element analysis of hyperbolic coolingsagmech24
Natural draught cooling towers are widely used in modern thermal and nuclear power plants. Because of their shear size and susceptibility to horizontal stresses, these towers with very thin shell thickness are unique constructions. The boundary conditions should be regarded as free at the top and fixed at the bottom. The cooling tower's material characteristics include a young modulus of 31GPa and a Poisson Ratio of 0.15. Finite Element Analysis was used to analyse these cooling towers for seismic and wind stresses. Wind loads on these cooling towers have been estimated in the form of pressures using the design wind pressure coefficients as supplied in IS: 11504-1985 code together with the design wind pressures at different levels as specified in IS: 875 (Part 3) - 1987 code. Ansys 18.2 was used to conduct the analysis. The study yields maximum deflection and maximum equivalent stress.
Lectures on Heat Transfer - Introduction - Applications - Fundamentals - Gove...tmuliya
This file contains Introduction to Heat Transfer and Fundamental laws governing heat transfer.
The slides were prepared while teaching Heat Transfer course to the M.Tech. students in Mechanical Engineering Dept. of St. Joseph Engineering College, Vamanjoor, Mangalore, India.
Prediction of friction factor and non dimensions numbers in force convectionIAEME Publication
This document summarizes an experimental study on heat transfer in an insulated cylindrical pipe. The study measured parameters like Nusselt number, Reynolds number, and frictional factor under different flow conditions. Experiments were conducted with air flow through a 40mm diameter pipe with 5mm insulation. Measurements were taken for 1/3, 2/3, and full opening of a control valve, and results were validated against analytical calculations using common heat transfer equations. Experimental values matched well with theoretical predictions.
This document summarizes the modeling and optimization of a thermal photovoltaic pumping system. It begins with an introduction to photovoltaic systems and presents the elements of a photovoltaic-thermal (PVT) collector. Models are described for the thermal system and photovoltaic cells. Characteristics of the photovoltaic generator and PVT collector are compared. Methods for optimizing the photovoltaic pumping system include maximum power point tracking techniques and impedance matching with a DC-DC converter. Results show that using a PVT collector and optimization methods increases the maximum power and efficiency compared to an non-optimized photovoltaic system.
Space Systems & Space Subsystems Fundamentals Technical Training Course SamplerJim Jenkins
This four-day course in space systems and space subsystems is for technical and management personnel who wish to gain an understanding of the important technical concepts in the development of space instrumentation, subsystems, and systems. The goal is to assist students to achieve their professional potential by endowing them with an understanding of the subsystems and supporting disciplines important to developing space instrumentation, space subsystems, and space systems. It designed for participants who expect to plan, design, build, integrate, test, launch, operate or manage subsystems, space systems, launch vehicles, spacecraft, payloads, or ground systems. The objective is to expose each participant to the fundamentals of each subsystem and their inter-relations, to not necessarily make each student a systems engineer, but to give aerospace engineers and managers a technically based space systems perspective. The fundamental concepts are introduced and illustrated by state-of-the-art examples. This course differs from the typical space systems course in that the technical aspects of each important subsystem are addressed.
1. The document discusses heat transfer through building structures via conduction. It describes how heat is conducted through walls, floors, ceilings, and other building components.
2. It explains the three primary modes of heat transfer: conduction, convection, and radiation. Conduction involves heat transfer at a molecular level through direct contact. Convection involves heat transfer via mass movement. Radiation involves heat transfer via electromagnetic waves.
3. It provides key equations for calculating conduction heat transfer rates through building walls and discusses factors like surface area, temperature difference, and transmittance value.
Design and Experimental Analysis of Solar air ConditionerIRJET Journal
This document describes the design and experimental analysis of a solar air conditioner. It consists of photovoltaic panels, a solar charger, inverter, and batteries that operate on solar energy for use in non-electrified areas. The system focuses on the design of a direct current air conditioning system integrated with a photovoltaic system. Experimental results show that increasing the generator temperature increases the coefficient of performance (COP) of the air conditioner, while decreasing the evaporator, condenser, and absorber temperatures also increases the COP. Graphs of the relationships between various temperature parameters and COP are presented. The conclusions indicate that the temperature of the still (generator) increases or decreases the COP.
This document discusses a thesis that analyzes heat transfer in a helical coil heat exchanger using computational fluid dynamics (CFD). The thesis was submitted in partial fulfillment of a Bachelor of Technology degree in Mechanical Engineering. The student conducted CFD analysis using ANSYS Fluent to simulate heat transfer between fluids flowing in parallel and counter-current directions in a tube-in-tube helical coil heat exchanger. Contours, vectors, and plots of parameters like temperature, velocity, heat flux, and Nusselt number were generated to analyze heat transfer performance under varying conditions. The overall goal was to provide data on heat transfer behavior in helical coil exchangers to address the lack of experimental results available for their
FINITE ELEMENT THERMAL ANALYSIS OF DEEP BOX-GIRDERSIAEME Publication
A three-dimensional thermal analysis using the finite element method was conducted in this research to evaluate the heat conduction in deep concrete box-girder bridges considering the temperature change of air, the thermal radiation from the sun and the speed of the wind. The current finite element analysis has predicted the concrete temperatures effectively with temperature errors ranged between 0.1 oC and 1.7 oC. The proposed finite element model was then used to evaluate the distribution of temperature in deep concrete box-girders considering the weather conditions of Gaziantep, Turkey. The weather data including solar radiation, air temperature and wind speed for a hot summer day were recorded from a specially installed weather station in the campus of the University of Gaziantep. The results showed that the AASHTO's gradient model was almost identical with the predicted temperature gradients at the top and the bottom surfaces and along the clear depth of the webs. However, the behavior along the top 1 m was different.
Experimentation and analysis of heat transfer through perforated fins of diff...SharathKumar528
Engineering Project by Abhijath HB, Dashartha H S, Akshay Mohanraj and Sharath Kumar M S involving analysis of Fins( Heat exchanging extensions) with various geometrical perforations.
Experimental Investigation of Heat Transfer by Electrically Heated Rectangula...IRJET Journal
This document presents an experimental investigation of heat transfer from an electrically heated rectangular surface by natural convection. The experiment measured the temperature distribution of air around a flat aluminum plate heated to temperatures between 347-365K at various angles from vertical. As the plate angle increased, the slope of the dimensionless temperature curve decreased, showing angle affects heat transfer. The Nusselt number also varied with angle. The experimental data agreed with previous work for vertical plates and showed temperature was independent of distance horizontally. The results provide insight into heat transfer behavior from inclined surfaces.
This document discusses the design of an HVAC system for a multiplex building. It begins with an introduction to air conditioning and controlling indoor air properties. It then discusses components of summer, winter, and year-round air conditioning systems. The document provides calculations to determine the cooling load of a sample classroom and design considerations for ductwork. It emphasizes the importance of HVAC system maintenance for health, efficiency, longevity, and reducing emergency repairs.
Experimental study of evaporation in a tubular solar stillIAEME Publication
This document summarizes an experimental study on evaporation in a tubular solar still. The study aims to determine the heat transfer coefficients in the still and their relationship to variables like temperature. An outdoor experiment is conducted using a prototype tubular solar still constructed with a PVC cover. Temperature readings are recorded. Theoretical models are analyzed to predict evaporation rate based on factors like humidity and vapor pressure. Constants C and n are evaluated using experimental data to better model heat transfer rate equations for this still design compared to previous models.
Experimental study of evaporation in a tubular solar stillIAEME Publication
This document summarizes an experimental study on evaporation in a tubular solar still. The study aims to determine heat transfer coefficients in the still and develop a model to predict evaporation. Experiments were conducted on a prototype tubular solar still in April 2012. Temperature and distillate output data were collected. Heat transfer coefficients were calculated using a modified Nusselt number approach. The constants C and n were determined through regression analysis of experimental data. The developed model was found to provide closer results to experiments compared to an existing Dunkle model. The tubular solar still design was found to improve distillate yield by 166% over a double slope solar still of the same basin area.
প্রথম বর্ষ, প্রথম পর্ব, রেফ্রিজারেশন অ্যান্ড এয়ার কন্ডিশনিং টেকনোলজি (আর এটি) উপস্থাপনায়: আবু মোহাম্মদ আতিকুল্যা
ইন্সট্রাক্টর (টেক্) আর এসি, ঢাকা পলিটেকনিক ইন্সটিটিউট,তেজগাঁও শিি/এ, ঢাকা-১২০৮।
67243 cooling and heating load calculationA.M. ATIQULLAH
বিষয় কোডঃ ৬৭২৪৩
বিষয়ঃ কুলিং অ্যান্ড হিটিং লোড ক্যালকুলেশন
অধ্যায়ঃ- ৪ (বিল্ডিং সার্ভের মাধ্যমে শীতাতপ নিয়ন্ত্রণ ব্যবস্থার হিট লোড নির্ণ্য়)
উপস্থাপনায়ঃ
আবু মোহাম্মদ আতিকুল্যা
ইন্সট্রাক্টর (টেক্) আর এসি
ঢাকা পলিটেকনিক ইন্সটিটিউট,
তেজগাঁও,ঢাকা-১২০৮।
Subject Code: 67243
Subject: Cooling And Heating Load Calculation
Chapter: 04 (Understand the Building Survey for Air Conditioning Heat Load)
Presented By: A.M.ATIQULLAH.
Instructor(Tech) RAC
Dhaka Polytechnic Institute,
Tejgaon,Dhaka-1208.
67243 cooling and heating & calculationA.M. ATIQULLAH
1. The document discusses building survey for air conditioning heat load calculation. It explains that a building survey needs to be conducted to understand the various heat sources in the building in order to accurately estimate the heat load.
2. Physical factors that need to be considered during the survey include heat from lights, fans, people, plugs and sockets. Ventilation heat, outside air temperature, and wall/roof heat transmission should also be accounted for.
3. Standard charts and tables from organizations like ASHRAE, ARI and Carrier provide data on ventilation heat, outside air heat, and heat from common building elements to simplify heat load calculations.
67243- cooling and heating & calculationA.M. ATIQULLAH
The document discusses cooling and heating load calculation. It lists the components of total cooling load for air conditioning such as building structure, internal loads, people load, air change load, and supplementary load. A safety factor of 5-10% is usually added to the total cooling load to account for inaccuracies. The meaning of plant capacity is explained as the capacity required to meet the total calculated cooling load while running the refrigeration or air conditioning system continuously for 24 hours. Procedures for calculating the cooling and heating loads and refrigeration plant capacity are also described.
Modeling and performance evaluation of energy efficient buildings envelope us...Editor IJMTER
In the present study, the extended concept of exergy analysis has been applied to a building located in
New Delhi with a volume of 60 m3 and having a single-glazed window on the south facing wall .With this study
thermal energy and thermal exergy flow were investigated to calculate the total thermal energy and exergy in
and out from the building. This allows performing a complex exergy analysis of the building in both heating
and cooling cases. The calculations were carried out by using the developed mathematical model of building
and measured solar radiation data on horizontal and vertical wall surface. The thermal energy and thermal
exergy flows for a space of a typical residential building of natural ventilation system with different parametric
changes (i.e. wall thickness, roof thickness, window material properties, window dimensions, wall material
thermal conductivity ) have been modelled and compared from the reference case .
Finite element analysis of hyperbolic coolingsagmech24
Natural draught cooling towers are widely used in modern thermal and nuclear power plants. Because of their shear size and susceptibility to horizontal stresses, these towers with very thin shell thickness are unique constructions. The boundary conditions should be regarded as free at the top and fixed at the bottom. The cooling tower's material characteristics include a young modulus of 31GPa and a Poisson Ratio of 0.15. Finite Element Analysis was used to analyse these cooling towers for seismic and wind stresses. Wind loads on these cooling towers have been estimated in the form of pressures using the design wind pressure coefficients as supplied in IS: 11504-1985 code together with the design wind pressures at different levels as specified in IS: 875 (Part 3) - 1987 code. Ansys 18.2 was used to conduct the analysis. The study yields maximum deflection and maximum equivalent stress.
Lectures on Heat Transfer - Introduction - Applications - Fundamentals - Gove...tmuliya
This file contains Introduction to Heat Transfer and Fundamental laws governing heat transfer.
The slides were prepared while teaching Heat Transfer course to the M.Tech. students in Mechanical Engineering Dept. of St. Joseph Engineering College, Vamanjoor, Mangalore, India.
Prediction of friction factor and non dimensions numbers in force convectionIAEME Publication
This document summarizes an experimental study on heat transfer in an insulated cylindrical pipe. The study measured parameters like Nusselt number, Reynolds number, and frictional factor under different flow conditions. Experiments were conducted with air flow through a 40mm diameter pipe with 5mm insulation. Measurements were taken for 1/3, 2/3, and full opening of a control valve, and results were validated against analytical calculations using common heat transfer equations. Experimental values matched well with theoretical predictions.
This document summarizes the modeling and optimization of a thermal photovoltaic pumping system. It begins with an introduction to photovoltaic systems and presents the elements of a photovoltaic-thermal (PVT) collector. Models are described for the thermal system and photovoltaic cells. Characteristics of the photovoltaic generator and PVT collector are compared. Methods for optimizing the photovoltaic pumping system include maximum power point tracking techniques and impedance matching with a DC-DC converter. Results show that using a PVT collector and optimization methods increases the maximum power and efficiency compared to an non-optimized photovoltaic system.
Space Systems & Space Subsystems Fundamentals Technical Training Course SamplerJim Jenkins
This four-day course in space systems and space subsystems is for technical and management personnel who wish to gain an understanding of the important technical concepts in the development of space instrumentation, subsystems, and systems. The goal is to assist students to achieve their professional potential by endowing them with an understanding of the subsystems and supporting disciplines important to developing space instrumentation, space subsystems, and space systems. It designed for participants who expect to plan, design, build, integrate, test, launch, operate or manage subsystems, space systems, launch vehicles, spacecraft, payloads, or ground systems. The objective is to expose each participant to the fundamentals of each subsystem and their inter-relations, to not necessarily make each student a systems engineer, but to give aerospace engineers and managers a technically based space systems perspective. The fundamental concepts are introduced and illustrated by state-of-the-art examples. This course differs from the typical space systems course in that the technical aspects of each important subsystem are addressed.
1. The document discusses heat transfer through building structures via conduction. It describes how heat is conducted through walls, floors, ceilings, and other building components.
2. It explains the three primary modes of heat transfer: conduction, convection, and radiation. Conduction involves heat transfer at a molecular level through direct contact. Convection involves heat transfer via mass movement. Radiation involves heat transfer via electromagnetic waves.
3. It provides key equations for calculating conduction heat transfer rates through building walls and discusses factors like surface area, temperature difference, and transmittance value.
Design and Experimental Analysis of Solar air ConditionerIRJET Journal
This document describes the design and experimental analysis of a solar air conditioner. It consists of photovoltaic panels, a solar charger, inverter, and batteries that operate on solar energy for use in non-electrified areas. The system focuses on the design of a direct current air conditioning system integrated with a photovoltaic system. Experimental results show that increasing the generator temperature increases the coefficient of performance (COP) of the air conditioner, while decreasing the evaporator, condenser, and absorber temperatures also increases the COP. Graphs of the relationships between various temperature parameters and COP are presented. The conclusions indicate that the temperature of the still (generator) increases or decreases the COP.
This document discusses a thesis that analyzes heat transfer in a helical coil heat exchanger using computational fluid dynamics (CFD). The thesis was submitted in partial fulfillment of a Bachelor of Technology degree in Mechanical Engineering. The student conducted CFD analysis using ANSYS Fluent to simulate heat transfer between fluids flowing in parallel and counter-current directions in a tube-in-tube helical coil heat exchanger. Contours, vectors, and plots of parameters like temperature, velocity, heat flux, and Nusselt number were generated to analyze heat transfer performance under varying conditions. The overall goal was to provide data on heat transfer behavior in helical coil exchangers to address the lack of experimental results available for their
FINITE ELEMENT THERMAL ANALYSIS OF DEEP BOX-GIRDERSIAEME Publication
A three-dimensional thermal analysis using the finite element method was conducted in this research to evaluate the heat conduction in deep concrete box-girder bridges considering the temperature change of air, the thermal radiation from the sun and the speed of the wind. The current finite element analysis has predicted the concrete temperatures effectively with temperature errors ranged between 0.1 oC and 1.7 oC. The proposed finite element model was then used to evaluate the distribution of temperature in deep concrete box-girders considering the weather conditions of Gaziantep, Turkey. The weather data including solar radiation, air temperature and wind speed for a hot summer day were recorded from a specially installed weather station in the campus of the University of Gaziantep. The results showed that the AASHTO's gradient model was almost identical with the predicted temperature gradients at the top and the bottom surfaces and along the clear depth of the webs. However, the behavior along the top 1 m was different.
Experimentation and analysis of heat transfer through perforated fins of diff...SharathKumar528
Engineering Project by Abhijath HB, Dashartha H S, Akshay Mohanraj and Sharath Kumar M S involving analysis of Fins( Heat exchanging extensions) with various geometrical perforations.
Experimental Investigation of Heat Transfer by Electrically Heated Rectangula...IRJET Journal
This document presents an experimental investigation of heat transfer from an electrically heated rectangular surface by natural convection. The experiment measured the temperature distribution of air around a flat aluminum plate heated to temperatures between 347-365K at various angles from vertical. As the plate angle increased, the slope of the dimensionless temperature curve decreased, showing angle affects heat transfer. The Nusselt number also varied with angle. The experimental data agreed with previous work for vertical plates and showed temperature was independent of distance horizontally. The results provide insight into heat transfer behavior from inclined surfaces.
This document discusses the design of an HVAC system for a multiplex building. It begins with an introduction to air conditioning and controlling indoor air properties. It then discusses components of summer, winter, and year-round air conditioning systems. The document provides calculations to determine the cooling load of a sample classroom and design considerations for ductwork. It emphasizes the importance of HVAC system maintenance for health, efficiency, longevity, and reducing emergency repairs.
Experimental study of evaporation in a tubular solar stillIAEME Publication
This document summarizes an experimental study on evaporation in a tubular solar still. The study aims to determine the heat transfer coefficients in the still and their relationship to variables like temperature. An outdoor experiment is conducted using a prototype tubular solar still constructed with a PVC cover. Temperature readings are recorded. Theoretical models are analyzed to predict evaporation rate based on factors like humidity and vapor pressure. Constants C and n are evaluated using experimental data to better model heat transfer rate equations for this still design compared to previous models.
Experimental study of evaporation in a tubular solar stillIAEME Publication
This document summarizes an experimental study on evaporation in a tubular solar still. The study aims to determine heat transfer coefficients in the still and develop a model to predict evaporation. Experiments were conducted on a prototype tubular solar still in April 2012. Temperature and distillate output data were collected. Heat transfer coefficients were calculated using a modified Nusselt number approach. The constants C and n were determined through regression analysis of experimental data. The developed model was found to provide closer results to experiments compared to an existing Dunkle model. The tubular solar still design was found to improve distillate yield by 166% over a double slope solar still of the same basin area.
Similar to 67243 cooling and heating & calculation (20)
প্রথম বর্ষ, প্রথম পর্ব, রেফ্রিজারেশন অ্যান্ড এয়ার কন্ডিশনিং টেকনোলজি (আর এটি) উপস্থাপনায়: আবু মোহাম্মদ আতিকুল্যা
ইন্সট্রাক্টর (টেক্) আর এসি, ঢাকা পলিটেকনিক ইন্সটিটিউট,তেজগাঁও শিি/এ, ঢাকা-১২০৮।
UN Environment is inviting Mr. Atiqullah to attend an intensive training workshop on R290-based room air conditioners in Guangzhou, China from November 22-24, 2018. The workshop will provide training on best practices and maintenance procedures for R290 air conditioners. UN Environment will cover the costs of airfare and daily subsistence allowance for participants according to UN rules. Participants are responsible for obtaining a Chinese visa and any travel/health insurance.
This document summarizes an experiment on the impact of jets using a hydraulic bench. The experiment aims to demonstrate that the force on a vane is proportional to the rate of delivery of momentum from a jet. Students collect data on the distance moved by a jockey weight under different flow rates. The results show the force on the vane increases linearly with the rate of delivery of momentum from the jet, consistent with theoretical expectations, although actual forces measured are slightly lower than predicted.
Chapter 5 ( understand the external heat load for cooling load calculation) d...A.M. ATIQULLAH
4th semester diploma in engineering refrigeration and air conditioning technology (RAT) Chapter-05 ( understand the external heat load for cooling load calculation)
4th semester diploma in engineering refrigeration and air conditioning technology(RAT) Chapter-05(understand the external heat load for cooling load calculation)
67243 -cooling and heating load calculationA.M. ATIQULLAH
The document provides information about internal heat loads in air conditioning, including heat gain from products, occupants, and appliances. Heat gain from products refers mainly to the heat generated by various types of stored goods. The heat gain from occupants considers the metabolic heat and sensible heat generated by the number of people present. Small appliances that are commonly used in conditioned spaces, such as computers, dryers, TVs, are also sources of heat gain. The importance of considering the chilling rate factor when calculating heat loads from products or appliances is emphasized, as the initial cooling load rate is typically 1.5 times higher than steady-state rate.
বিষয় কোডঃ ৬৭২৪৩
বিষয়ঃ কুলিং অ্যান্ড হিটিং লোড ক্যালকুলেশন
অধ্যায়ঃ- ৪ (বিল্ডিং সার্ভের মাধ্যমে শীতাতপ নিয়ন্ত্রণ ব্যবস্থার হিট লোড নির্ণ্য়)
উপস্থাপনায়ঃ
আবু মোহাম্মদ আতিকুল্যা
ইন্সট্রাক্টর (টেক্) আর এসি
ঢাকা পলিটেকনিক ইন্সটিটিউট,
তেজগাঁও,ঢাকা-১২০৮।
Subject Code: 67243
Subject: Cooling And Heating Load Calculation
Chapter: 04 (Understand the Building Survey for Air Conditioning Heat Load)
Presented By: A.M.ATIQULLAH.
Instructor(Tech) RAC
Dhaka Polytechnic Institute,
Tejgaon,Dhaka-1208.
This presentation template provides instructions for editing and using the template in PowerPoint or Google Slides. It contains various slides demonstrating design elements like quotes, images, diagrams, tables, and icons that can be used in a presentation. The final slides thank the audience and provide credits for resources used in the template. The presentation is meant to serve as an example of best practices and elements that can be included in presentations.
This document summarizes a presentation by A.M. Atiqullah from Batch 11, Group B. It outlines three best plans of action, including developing a refrigeration and air conditioning lab for students by June 2018, providing competence-based learning activities in the lab within six months, and developing a chemistry lab within six months. It also briefly lists the key learnings from NYP and seven total plans of action, such as developing additional labs, student career development, and increasing practical based learning.
67243 cooling and heating & calculationA.M. ATIQULLAH
The document discusses heat gain in air conditioning systems. It describes the three main sources of internal heat gain: from products or processes in the space, from occupants, and from appliances used in the space. Heat gain from products is calculated based on the quantity, specific heat, and temperature difference of the products. Heat gain from occupants considers the number of people and their activity levels. Appliances like computers, dryers, and TVs that are used in the conditioned space also contribute to internal heat gain. It emphasizes the importance of considering the chilling rate factor when calculating heat gains, as products may not reach design temperature immediately during initial cooling.
Chapter 5 (Understand the external heat load for cooling load calculation) dt...A.M. ATIQULLAH
1. The document discusses heat transfer through building structures via conduction and describes the various external heat loads to consider for cooling load calculations, including solar heat gain.
2. It explains that heat transfer occurs through conduction within building materials on a molecular level, convection through air movement, and radiation through electromagnetic waves.
3. Methods of calculating conduction heat transfer rate through walls using surface area, transmittance value, and temperature difference are presented.
67243 cooling and heating load calculation chapter-2A.M. ATIQULLAH
The document discusses psychrometry, which is the study of properties of air and water vapor mixtures. It defines key terms like dry air, moist air, saturated air, humidity, absolute humidity, relative humidity, dry bulb temperature, and wet bulb temperature. Dry bulb temperature refers to the usual temperature reading in a thermometer, while wet bulb temperature is lower and accounts for evaporative cooling effects from a wet wick. Relative humidity compares the actual water vapor content in air to the maximum it could hold at the same temperature and pressure. The document provides background on the composition of dry air and the various processes involved in psychrometric analysis.
67243 cooling and heating load calculationA.M. ATIQULLAH
This document contains information from an instructor on calculating solar heat load. It begins with introducing key concepts like direct and diffuse radiation. It then provides formulas and equations for calculating various components of solar radiation heat gain, such as the direct radiation on a surface based on its orientation and location. These include equations for calculating solar intensity, azimuth, declination, and more. The document aims to explain the methodology for computing the total solar heat load on a building or structure.
67243 cooling and heating load calculationA.M. ATIQULLAH
The document discusses psychrometry, which is the study of properties of air and water vapor mixtures. It defines key terms like dry air, moist air, saturated air, humidity, absolute humidity, relative humidity, dry bulb temperature, and wet bulb temperature. Dry bulb temperature refers to the usual temperature reading in a thermometer, while wet bulb temperature is lower and accounts for evaporative cooling effects from a wet wick. Relative humidity compares the actual water vapor content in air to the maximum it could hold at the same temperature and pressure. The psychrometric chart graphs these properties and is used to analyze air conditioning processes.
Presentation of IEEE Slovenia CIS (Computational Intelligence Society) Chapte...University of Maribor
Slides from talk presenting:
Aleš Zamuda: Presentation of IEEE Slovenia CIS (Computational Intelligence Society) Chapter and Networking.
Presentation at IcETRAN 2024 session:
"Inter-Society Networking Panel GRSS/MTT-S/CIS
Panel Session: Promoting Connection and Cooperation"
IEEE Slovenia GRSS
IEEE Serbia and Montenegro MTT-S
IEEE Slovenia CIS
11TH INTERNATIONAL CONFERENCE ON ELECTRICAL, ELECTRONIC AND COMPUTING ENGINEERING
3-6 June 2024, Niš, Serbia
Embedded machine learning-based road conditions and driving behavior monitoringIJECEIAES
Car accident rates have increased in recent years, resulting in losses in human lives, properties, and other financial costs. An embedded machine learning-based system is developed to address this critical issue. The system can monitor road conditions, detect driving patterns, and identify aggressive driving behaviors. The system is based on neural networks trained on a comprehensive dataset of driving events, driving styles, and road conditions. The system effectively detects potential risks and helps mitigate the frequency and impact of accidents. The primary goal is to ensure the safety of drivers and vehicles. Collecting data involved gathering information on three key road events: normal street and normal drive, speed bumps, circular yellow speed bumps, and three aggressive driving actions: sudden start, sudden stop, and sudden entry. The gathered data is processed and analyzed using a machine learning system designed for limited power and memory devices. The developed system resulted in 91.9% accuracy, 93.6% precision, and 92% recall. The achieved inference time on an Arduino Nano 33 BLE Sense with a 32-bit CPU running at 64 MHz is 34 ms and requires 2.6 kB peak RAM and 139.9 kB program flash memory, making it suitable for resource-constrained embedded systems.
Advanced control scheme of doubly fed induction generator for wind turbine us...IJECEIAES
This paper describes a speed control device for generating electrical energy on an electricity network based on the doubly fed induction generator (DFIG) used for wind power conversion systems. At first, a double-fed induction generator model was constructed. A control law is formulated to govern the flow of energy between the stator of a DFIG and the energy network using three types of controllers: proportional integral (PI), sliding mode controller (SMC) and second order sliding mode controller (SOSMC). Their different results in terms of power reference tracking, reaction to unexpected speed fluctuations, sensitivity to perturbations, and resilience against machine parameter alterations are compared. MATLAB/Simulink was used to conduct the simulations for the preceding study. Multiple simulations have shown very satisfying results, and the investigations demonstrate the efficacy and power-enhancing capabilities of the suggested control system.
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.
We have compiled the most important slides from each speaker's presentation. This year’s compilation, available for free, captures the key insights and contributions shared during the DfMAy 2024 conference.
Harnessing WebAssembly for Real-time Stateless Streaming PipelinesChristina Lin
Traditionally, dealing with real-time data pipelines has involved significant overhead, even for straightforward tasks like data transformation or masking. However, in this talk, we’ll venture into the dynamic realm of WebAssembly (WASM) and discover how it can revolutionize the creation of stateless streaming pipelines within a Kafka (Redpanda) broker. These pipelines are adept at managing low-latency, high-data-volume scenarios.
A review on techniques and modelling methodologies used for checking electrom...nooriasukmaningtyas
The proper function of the integrated circuit (IC) in an inhibiting electromagnetic environment has always been a serious concern throughout the decades of revolution in the world of electronics, from disjunct devices to today’s integrated circuit technology, where billions of transistors are combined on a single chip. The automotive industry and smart vehicles in particular, are confronting design issues such as being prone to electromagnetic interference (EMI). Electronic control devices calculate incorrect outputs because of EMI and sensors give misleading values which can prove fatal in case of automotives. In this paper, the authors have non exhaustively tried to review research work concerned with the investigation of EMI in ICs and prediction of this EMI using various modelling methodologies and measurement setups.
4. S.O:5.1 Describe the Heat Gain by Conduction
Through Building Structure.
S.O:5.2 Explain the Solar Heat Gain Throughout
Side Wall and Roof.
S.O: 5.3 Describe Solar Heat Gain Through Glass Area.
S.O: 5.4 Calculate the Heat Gain Due to Infiltration
and Ventilation Load of Door and Window.
S.O:5.5 Solve the Problems Relating
to the External Heat Load.Presented By : A.M.Atiqullah,INSTRUCTOR(Tech)RACDHAKA POLYTECHNIC INSTITUTE,M:01711-056403
6. S.O: 5.1 Describe the heat gain by
conduction through building structure.
Presented By : A.M.Atiqullah,INSTRUCTOR(Tech)RACDHAKA POLYTECHNIC INSTITUTE,M:01711-056403
7. Primary Heat Transport Modes are:
1.Conduction(cwienb) (heat flow on a molecular scale. Medium
at rest or moving);
2.Convection(cwiPjb) (heat conveyed as internal thermal energy of mass
that is displaced by mean or turbulent motion);
3. Radiation(wewKiY) (heat transfer by electromagnetic waves such
as infrared or visible light).
1. Conduction Heat Transfe : Conduction heat transfer problems
relevant to buildings include:
(a)Exterior wall conduction- • transient heat transfer responding to
climatic effects, such as temperature fluctuation, solar radiation, wind
and precipitation; thermal storage ... damping and lag effect; and cold-
bridge effect (two-dimensional and non-linear heat flow path).
(b) Interior mass conduction- • heat storage in partition walls,
floor/ceiling sandwich.
(c) Conversion from heat gain/loss to cooling and heating load.
(d) Ground heat loss from slab-on-grade floor and basement walls.
Presented By : A.M.Atiqullah,INSTRUCTOR(Tech)RACDHAKA POLYTECHNIC INSTITUTE,M:01711-056403
S.O: 5.1 Describe the Heat Gain by Conduction
Through Building Structure
8. Presented By : A.M.Atiqullah,INSTRUCTOR(Tech)RACDHAKA POLYTECHNIC INSTITUTE,M:01711-056403
S.O: 5.1 Describe the heat gain by conduction
through building structure.
9. 3. Radiant Heat Exchange Radiation heat transfer is very
important in building application in the following a reas:
(a) Short wavelength radiation: • solar heat absorption on opaque
exterior surfaces,
• solar heat transmission through transparent surfaces,
• solar heat absorption and reflection by interior buildings Unlaces,
• absorption and reflection of solar heat by window glass.
(b) Long-wavelength radiation: • heat emission by the exterior surfaces
to the sky ,
• heat exchange among interior surfaces,
• heat exchange between interior surfaces and occupants,
• heat exchange between the lighting fixture and interior surfaces.
Presented By : A.M.Atiqullah,INSTRUCTOR(Tech)RACDHAKA POLYTECHNIC INSTITUTE,M:01711-056403
S.O: 5.1 Describe the heat gain by
conduction through building structure.
10. Presented By : A.M.Atiqullah,INSTRUCTOR(Tech)RACDHAKA POLYTECHNIC INSTITUTE,M:01711-056403
S.O: 5.1 Describe the heat gain by conduction
through building structure.
11. Presented By : A.M.Atiqullah,INSTRUCTOR(Tech)RACDHAKA POLYTECHNIC INSTITUTE,M:01711-056403
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S.O: 5.1 Describe the Heat Gain by Conduction
Through Building Structure
12. Presented By : A.M.Atiqullah,INSTRUCTOR(Tech)RACDHAKA POLYTECHNIC INSTITUTE,M:01711-056403
S.O: 5.1 Describe the heat gain by conduction
through building structure.
13. Presented By : A.M.Atiqullah,INSTRUCTOR(Tech)RACDHAKA POLYTECHNIC INSTITUTE,M:01711-056403
Heat transfer through Conduction: Heat transfer through a
material takes place by conduction from warm to cold side. The
same process takes place in a building. Generally the thermal
conductivity of the building materials will be much lower. In solid
bodies including building components, thermal conduction takes
place when one part of the component is subjected to higher
temperature and the other part to a lower temperature condition.
Most cases of thermal conduction are usually analysed and
treated in their simplified form as one dimensional heat flow
cases, i.e. heat flow in directions other than the main direction is
neglected. Similarly, if the changes in atmospheric conditions
(inside and I or outside) are assumed to be very slow, neglecting
these changes, the process of heat transfer can be assumed to be
"Steady State Heat Transfer" in its simplified form.
S.O: 5.1 Describe the heat gain by conduction
through building structure.
14. Presented By : A.M.Atiqullah,INSTRUCTOR(Tech)RACDHAKA POLYTECHNIC INSTITUTE,M:01711-056403
S.O: 5.1 Describe the Heat Gain by Conduction Through Building Structure.
16. Presented By : A.M.Atiqullah,INSTRUCTOR(Tech)RACDHAKA POLYTECHNIC INSTITUTE,M:01711-056403
In Summer the Solar Radiation Affects the
Outside Surface of Wall and Roof. The Absorbed
Radiation Increases the Temperature of the
Outside Surface to a Value that is Greater than
Outside Air Temperature. This Outside Surface
Temperature is Called Solar Air Temperature.
roof
side
wall
17. Presented By : A.M.Atiqullah,INSTRUCTOR(Tech)RACDHAKA POLYTECHNIC INSTITUTE,M:01711-056403
ROOF AND WALL HEAT GAIN (CLTD METHOD)
In CLTD/SCL/CLF method the heat gain through wall and roof is
Q = U*A*(CLTD) [ CLF = Cooling Load Factor ]
Q = Sensible Heat Gain through Wall or Roof
A = Surface Area of Wall or Roof
U = Overall U-Value for composite Wall or Roof
CLTD=Cooling load temperature difference from ASHRAE table for a
given
Latitude
Wall or roof type
Wall or roof exposure orientation
Hour of day
1
2
3
18. Presented By : A.M.Atiqullah,INSTRUCTOR(Tech)RACDHAKA POLYTECHNIC INSTITUTE,M:01711-056403
23. Presented By : A.M.Atiqullah,INSTRUCTOR(Tech)RACDHAKA POLYTECHNIC INSTITUTE,M:01711-056403
Shading Coefficient(SC)
Here, 𝜆(Lamda) is the Wave Lengh of Radiation and θ is the
Angle of Incidence. “T” is the Transmissivity of the Glass,
“A” is its Absorptivity, and “N” is the Fraction of Absorbed
Energy that is re-emitted into the space. The Overall Shading
Coefficient is thus given by the Ratio:
S.C = F(𝜆, 𝜃)1 /F(𝜆, 𝜃)0
Mmmmmmmmmmmmmkkkkk,,m
Here “T”(𝜆) is the spectral Transmittance at a given Wave
Length in Nanometers and E(𝜆) is the Incident Solar
Spectral Irradiance.
25. Infiltration is described as outside air that leaks into a building structure.
These leaks could be through the building construction or through entry
doors. Infiltration heat gains are found by the following equations. These
equations are discussed more in the Psychrometrics Section
The first equation is the total heat gains using enthalpy. In this equation, the
volumetric flow rate of the infiltration or ventilation air must be known. This
value is converted and multiplied by the difference in enthalpy between the
outdoor air conditions and the indoor air conditions.
The following two equation split the total heat gain into the sensible and
latent heat loads.
Sensible Heat Gains are calculated by multiplying the CFM of the infiltrated
air by the difference in the temperatures of the indoor and outdoor air
Presented By : A.M.Atiqullah,INSTRUCTOR(Tech)RACDHAKA POLYTECHNIC INSTITUTE,M:01711-056403
26. How to Calculate Heat Load :
Calculating a heat load is necessary before the installation of a radiant heating system can begin,
since different types of radiant heating systems have different BTU output values.
A typical heat load calculation consists of surface heat loss calculation and heat loss due to air
infiltration. Both should be done separately for every room in the house, so having a floor plan
with dimensions of all walls, floors, ceiling, as well as doors and windows is a good place to
start.
Below is a sample 5-step manual to surface heat loss calculation:
Step 1 – Calculate Delta T (Design Temperature):
Delta T is a difference between indoor design temperature (T1) and outdoor design temperature
(T2), where indoor design temperature is typically 68-72℉ depending on your preference, and
outdoor design temperature is a typical low during the heating season. The former can be
obtained by calling your local utility company.
Assuming that T1 is 72℉ and T2 is –5℉, Delta T = 72℉ - (-5℉) = (72℉ + 5℉) = 77℉
Step 2 – Calculate surface area:
If the calculation is done for an outside wall, with windows and doors, the calculations for the
window and door heat loss should be done separately.
Wall Area = Height x Width - Door Surface - Window Surface
If, Wall Area = 8 ft x 22 ft – 24 sq ft - 14sq ft = 176 sq ft – 38 sq ft = 138 sq ft
Step 3 – Calculate U-value:
Use "Typical R-values and U-values" guide to obtain the wall R-value.
U-value = 1 / R-value
U-value = 1 / 14.3 = 0.07
Step 4 – Calculate wall surface heat loss:
Surface heat loss can be calculated using the formula below:
Surface Heat Loss = U-value x Wall Area x Delta T
If, Surface Heat Loss = 0.07 x 138 sq ft x 77 °F = 744 BTUH is
(U-value is based on assuming a 2x4 wood frame wall with 3.5" fiberglass insulation)
27. Step 5 – Calculate total wall heat loss:
Follow the steps 1 through 4 to calculate heat loss separately for windows, doors, and ceiling.
If, Door Heat Loss = 0.49 x 24sq ft x 77F = 906 BTUH
(U-value is based on assuming a solid wood door)
If, Window Heat Loss = 0.65 x 14sq ft x 77F = 701 BTUH
(U-value is based on assuming a double-panel window)
If, Ceiling Heat Loss = 0.05 x 352sq ft x 77F = 1355 BTUH
(U-value is based on assuming a 6" fiberglass insulation. Ceiling surface is 22ft x 16ft)
Now, add all the number together:
Total Wall heat loss = (Wall loss + Window Loss + Door loss + Ceiling loss)
Total Wall heat loss = 744 BTUH + 906 BTUH + 701 BTUH + 1352 BTUH = 3703 BTUH
Air infiltration rates should always be taken into consideration.
The following formula can be used to calculate heat loss for a room
due to air infiltration:
Air Infiltration Heat Loss = Room Volume x Delta T x Air Changes per Hour x 0.018
Where Room Volume = Length x Width x Height
Air Changes per Hour accounts for air leakage into the room.
For example: Air Infiltration Heat Loss = (22ft x 16ft x 8ft) x 77F x 1.2 x 0.018 = 4683 BTUH
Note: For actual calculations, contact your contractor or system designer.
Presented By : A.M.Atiqullah,INSTRUCTOR(Tech)RACDHAKA POLYTECHNIC INSTITUTE,M:01711-056403
28. Latent Heat Gains are calculated by multiplying the CFM of infiltrated air by
the difference in the humidity ratio of the indoor air and the outdoor air.
It is important to note that these loads
are not seen directly by the cooling coil.
These are indirect loads that occur in
each air conditioned space. Ventilation
air is seen directly at the coil and thus
this air must be cooled down to the
supply air distribution temperature
which is much lower than the room
condition air
Presented By : A.M.Atiqullah,INSTRUCTOR(Tech)RACDHAKA POLYTECHNIC INSTITUTE,M:01711-056403