this lab work was done by Abnet Mengesha Dube,student at Addis ababa university(AAIT).
objective of the lab is to determine the parameters which affect the operating capacity and efficiency of the radial flow fan.
The turbo machine is an energy conversion device which converts mechanical energy to kinetic/pressure energy or vice versa. The conversion is done through the dynamic interaction between a continuously flowing fluid and rotating machine component. Turbo machines comprise various types of fans, blowers, compressors, pumps, turbines etc. More and more experimental research work is available in the field of turbo machine design and its evaluation. Literature review has revealed that a few literatures are available on three dimensional numerical analysis of a centrifugal fan/blower. Literature review in present work is highly focused on centrifugal blower and use of CFD techniques in turbo machines. In this course of work, input parameters and design parameters of centrifugal blower is obtained as per church and Osborne design methodology developed by Kinnari Shah, PROF. NitinVibhakar. Fluid model is made as per this design data in PRO-E SOFTWARE. And this fluid model is simulated using computational fluid dynamics (CFD) approach in ANSYS (CFX). Numerical analysis carried out in this work is to understand the flow characteristics at design and off-design conditions under varying mass flow rates, varying rotational speeds and number of blades in both design methodology. This numerical analysis is under consideration of steady flow and for rotational domain (frozen rotor interference) is used. Performance curves are obtained under different variable inlet parameters like volume flow rate, rotational speed and number of impeller blades. Here mass flow rate as a inlet boundary condition and static pressure as a outlet boundary condition. Volume flow rate is changed by changing the mass flow rate at inlet. Overall work carried out on flow behaviour and performance graphs for different cases are discussed in length in results and discussions chapter. Comparative evaluation of two design method indicates that error in static pressure gradient is higher in Osborne design rather than church design, and performance parameters are better for church design than the Osborne design.
this lab work was done by Abnet Mengesha Dube,student at Addis ababa university(AAIT).
objective of the lab is to determine the parameters which affect the operating capacity and efficiency of the radial flow fan.
The turbo machine is an energy conversion device which converts mechanical energy to kinetic/pressure energy or vice versa. The conversion is done through the dynamic interaction between a continuously flowing fluid and rotating machine component. Turbo machines comprise various types of fans, blowers, compressors, pumps, turbines etc. More and more experimental research work is available in the field of turbo machine design and its evaluation. Literature review has revealed that a few literatures are available on three dimensional numerical analysis of a centrifugal fan/blower. Literature review in present work is highly focused on centrifugal blower and use of CFD techniques in turbo machines. In this course of work, input parameters and design parameters of centrifugal blower is obtained as per church and Osborne design methodology developed by Kinnari Shah, PROF. NitinVibhakar. Fluid model is made as per this design data in PRO-E SOFTWARE. And this fluid model is simulated using computational fluid dynamics (CFD) approach in ANSYS (CFX). Numerical analysis carried out in this work is to understand the flow characteristics at design and off-design conditions under varying mass flow rates, varying rotational speeds and number of blades in both design methodology. This numerical analysis is under consideration of steady flow and for rotational domain (frozen rotor interference) is used. Performance curves are obtained under different variable inlet parameters like volume flow rate, rotational speed and number of impeller blades. Here mass flow rate as a inlet boundary condition and static pressure as a outlet boundary condition. Volume flow rate is changed by changing the mass flow rate at inlet. Overall work carried out on flow behaviour and performance graphs for different cases are discussed in length in results and discussions chapter. Comparative evaluation of two design method indicates that error in static pressure gradient is higher in Osborne design rather than church design, and performance parameters are better for church design than the Osborne design.
Performance and Fault diagnosis of Horizontal Axis Wind Turbine Componentsijsrd.com
With recent surge in fossil fuel prices and demand for cleaner renewable energy sources, Wind Turbine has become an alternative approach for power generation technology. Therefore operation, maintenance and repair techniques will be developed for efficient wind power generation. Failure analysis can support operation, management of spare components and accessories in wind plants, maintenance and repair of wind turbine. In this paper author aiming at eye of wind plants i.e. structure, function and analysis of common faults to find out fault laws, fault causes and effect on their corresponding performance measures.
Stirling engine performance prediction using schmidt analysis by considering ...eSAT Journals
Abstract A low temperature ratio Stirling engine analysis required for cost effective, less environment harmfulness and more efficient power generation compare to Rankine cycle and Brayton cycle for this temperature ratio. A new and complete model for a Stirling engine has been established. This computerized model predicts the behavior of existing engines reasonably accurately for cases where a quantitative comparison is available. In order to obtain a closed solution suitable for design optimization a simplified model for a Stirling engine has been derived considering different types of losses in this engine. This new model has sufficient accuracy for prediction of the behavior a real engine and its results are quite close to the complete model predictions. Index Terms: Stirling Engine, Schmidt Analysis, Low temperature ratio, Engine Losses, computerized model
Water cross flow shell and tube heat exchanger | Heat Transfer LaboratorySaif al-din ali
SAIF ALDIN ALI MADIN
سيف الدين علي ماضي
S96aif@gmail.com
Experiment Name: - Water / Water Cross Flow Shell and Tube Heat
Exchanger
1. Abstract
Studying the performance of this type of heat exchanger
2. Introduction
Types of heat exchangers:
Onetype of heat exchanger is that of a double pipe arrangement with either
counter or parallel flow and with either the hot or cold fluid occupying the annular
space and the other fluid occupying the inside of the inner pipe. A type of heat
exchanger widely used in the chemical process inches is that of the shell and tube
arrangement
Centrifugal compressor head - Impact of MW and other parametersSudhindra Tiwari
Please read the revised version.
A sequential approach to describe compressor head, pressure, system head and impact of MW and other suction parameters on head.
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.
Position characterization of electro pneumatic closed loop control valveeSAT Journals
Abstract This paper presents position characterization of an Electro-pneumatic closed loop control valve BOSCH 0 820 040 001. The experimental measurements carried out gives pressure gain and the precise position repetition accuracy. A Programmable Logic Controller (PLC) program is developed in ladder logic using IndraLogic L20 software of Rexroth Bosch to determine position repetition accuracy. Keywords— Electro-Pneumatic closed loop control valve, Pressure gain, Precise Position, Repetition accuracy, PLC
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Performance and Fault diagnosis of Horizontal Axis Wind Turbine Componentsijsrd.com
With recent surge in fossil fuel prices and demand for cleaner renewable energy sources, Wind Turbine has become an alternative approach for power generation technology. Therefore operation, maintenance and repair techniques will be developed for efficient wind power generation. Failure analysis can support operation, management of spare components and accessories in wind plants, maintenance and repair of wind turbine. In this paper author aiming at eye of wind plants i.e. structure, function and analysis of common faults to find out fault laws, fault causes and effect on their corresponding performance measures.
Stirling engine performance prediction using schmidt analysis by considering ...eSAT Journals
Abstract A low temperature ratio Stirling engine analysis required for cost effective, less environment harmfulness and more efficient power generation compare to Rankine cycle and Brayton cycle for this temperature ratio. A new and complete model for a Stirling engine has been established. This computerized model predicts the behavior of existing engines reasonably accurately for cases where a quantitative comparison is available. In order to obtain a closed solution suitable for design optimization a simplified model for a Stirling engine has been derived considering different types of losses in this engine. This new model has sufficient accuracy for prediction of the behavior a real engine and its results are quite close to the complete model predictions. Index Terms: Stirling Engine, Schmidt Analysis, Low temperature ratio, Engine Losses, computerized model
Water cross flow shell and tube heat exchanger | Heat Transfer LaboratorySaif al-din ali
SAIF ALDIN ALI MADIN
سيف الدين علي ماضي
S96aif@gmail.com
Experiment Name: - Water / Water Cross Flow Shell and Tube Heat
Exchanger
1. Abstract
Studying the performance of this type of heat exchanger
2. Introduction
Types of heat exchangers:
Onetype of heat exchanger is that of a double pipe arrangement with either
counter or parallel flow and with either the hot or cold fluid occupying the annular
space and the other fluid occupying the inside of the inner pipe. A type of heat
exchanger widely used in the chemical process inches is that of the shell and tube
arrangement
Centrifugal compressor head - Impact of MW and other parametersSudhindra Tiwari
Please read the revised version.
A sequential approach to describe compressor head, pressure, system head and impact of MW and other suction parameters on head.
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.
Position characterization of electro pneumatic closed loop control valveeSAT Journals
Abstract This paper presents position characterization of an Electro-pneumatic closed loop control valve BOSCH 0 820 040 001. The experimental measurements carried out gives pressure gain and the precise position repetition accuracy. A Programmable Logic Controller (PLC) program is developed in ladder logic using IndraLogic L20 software of Rexroth Bosch to determine position repetition accuracy. Keywords— Electro-Pneumatic closed loop control valve, Pressure gain, Precise Position, Repetition accuracy, PLC
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Paper presented at the International Conference on Using ICT, Social Media and Mobile Technologies to Foster Self-Organisation in Urban and Neighbourhood Governance. Delft, Netherlands. 16 May 2013
Designing and installation of low cost optimized wind monitoring systemeSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
forced heat convection | HEAT TRANSFER LaboratorySaif al-din ali
SAIF ALDIN ALI MADIN
سيف الدين علي ماضي
S96aif@gmail.com
Experiment Name: Forced Heat Convection
2. Experiment Aim:
1. Calculating the forced heat convection coefficient (ℎ퐹퐶) for a heated cylinder
2. Find the relations between Re N, and NuNo. for fluid flow around a cylinder
3. Introduction:
Convection; is the mode of energy transfer between a solid surface and
the adjacent liquid or gas that is in motion, and it involves the
combined effects of conduction and fluid motion, convection is divided
into two types:
This report gives basic knowledge about overhauling of Turbine, erection, commissioning.
For more information visit@supratheek Turbo Engineering Services
Design, Development, Fabrication and Testing of Small Vertical Axis Wind Turb...YogeshIJTSRD
An experimental investigation has been carried has been carried out on a design, Development, Fabrication, and Testing of small Vertical axis wind turbine. An extremely simple design, of a vertical axis wind rotor using two flat vertical Vanes, swinging vanes has been fabricated and tested to obtain its performance. The torque and power coefficient have been obtained and presented in this paper the result are highly encouraging and indicate the usefulness of the swinging vane rotor at low wind regions. This paper is presented on the basis of technology two blade vertical axis wind turbine system. Dr. Mukesh Kumar Lalji "Design, Development, Fabrication and Testing of Small Vertical Axis Wind Turbinev" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-3 , April 2021, URL: https://www.ijtsrd.com/papers/ijtsrd39817.pdf Paper URL: https://www.ijtsrd.com/engineering/civil-engineering/39817/design-development-fabrication-and-testing-of-small-vertical-axis-wind-turbinev/dr-mukesh-kumar-lalji
This slide was prepared by me for I was given project on the course applied electro-chemistry. Am student at Addis Ababa university institute of technology , addis ababa Ethiopia
this eperiment was done by
Anet Mengesha Dube
at addis ababa university
addis ababa institute of tecnology
school of bio &chemichal_engineering
2nd year student
1. By abnetmengesh(ADDIS ABABAUNIVERSTIYINSTITUTE OFTECHNOLOGY2015)
1
Radial flow fan test
Objective:
The main objectives of this lab>
To measure the total pressure drop with respect to flow rate
To measure static pressure drop with respect to flow rate.
To know the parameters that affects the operation capacity and efficiency of
the fan.
And determine which parameters are the most determinant for the flow fan.
Theory
A radial flow fan comprising an impeller where the direction of the entry air flow is vertical
to the direction of the exit air flow
A centrifugal fan is a mechanical device for moving air or other gases. These fans increase
the speed of air stream with the rotating impellers. They use the kinetic energy of the
impellers or the rotating blade to increase the pressure of the air/gas stream which in turn
moves them against the resistance caused by ducts, dampers and other components.
Centrifugal fans accelerate air radially, changing the direction (typically by 90°) of the
airflow. They are sturdy, quiet, reliable, and capable of operating over a wide range of
conditions.
Centrifugal fans are constant displacement devices or constant volume devices, meaning
that, at a constant fan speed, a centrifugal fan will pump a constant volume of air rather
than a constant mass. This means that the air velocity in a system is fixed even though mass
flow rate through the fan is not.
The centrifugal fan is one of the most widely used fans. Centrifugal fans are by far the most
prevalent type of fan used in the HVAC industry today. They are usually cheaper than axial
fans and simpler in construction. It is used in transporting gas or materials and in
ventilation system for buildings. They are also used commonly in central heating/cooling
systems. They are also well-suited for industrial processes and air pollution control
systems.
It has a fan wheel composed of a number of fan blades, or ribs, mounted around a hub. As
shown in the figure, the hub turns on a driveshaft that passes through the fan housing. The
gas enters from the side of the fan wheel, turns 90 degrees and accelerates due to
centrifugal force as it flows over the fan blades and exits the fan housing.
2. By abnetmengesh(ADDIS ABABAUNIVERSTIYINSTITUTE OFTECHNOLOGY2015)
2
Main parts of a centrifugal fan are:
Fan housing
Impellers
Inlet and outlet ducts
Drive shaft
Drive mechanism
Principles of operation
The centrifugal fan uses the centrifugal power generated from the rotation of impellers to
increase the kinetic energy of air/gases. When the impellers rotate, the gas near the
impellers is thrown-off from the impellers due to the centrifugal force and then moves into
the fan casing. As a result, the kinetic energy of gas is converted to pressure because of
system resistance offered by the casing and duct. The gas is then guided to the exit via
outlet ducts. After the gas is thrown-off, the gas pressure in the middle region of the
impellers decreases. The gas from the impeller eye rushes in to normalize this pressure.
This cycle repeats and therefore the gas can be continuously transferred.
Apparatus and materials used
Data
Dim
Nozzle
position
Turn 1 3 5 7 9 11 13 15 17 19
wattmete
r
𝛼 25 27 28 31.5 35 39 41 43 46 48
Voltage V 450 450 450 450 450 450 450 450 450 450
current A 2.7 2.8 2.9 3 3.05 3.12 3.15 3.20 3.25 3.3
Speed n rpm 280
0
280
0
280
0
280
0
280
0
280
0
280
0
280
0
280
0
280
0
∆𝑝vent mmw 40 130 270 410 610 830 103 120 138 151
3. By abnetmengesh(ADDIS ABABAUNIVERSTIYINSTITUTE OFTECHNOLOGY2015)
3
Bf=603mmHg
T=210C
B =Bf-T/8
C =20;
Power=C/2*𝛼w
SFven=1
SFfav= (808.3/0.787)*(inch/250)
AD=0.1452m
A0=34.77m
1, Calculation
c 0 0 0 0
∆𝑝fan mmw
c
930 890 885 880 860 840 790 740 680 610
value Di
m
1 Nozzle
position
Tur
n
1 3 5 7 9 11 13 15 17 19
2 wattmeter 𝛼 25 27 28 31.5 35 39 41 43 46 48
3 Voltage V 450 450 450 450 450 450 450 450 450 450
4 current A 2.7 2.8 2.9 3 3.05 3.12 3.15 3.2 3.25 3.3
5 Speed n rp
m
280
0
280
0
280
0
280
0
280
0
280
0
280
0
280
0
280
0
280
0
6 ∆𝑝vent m
m
wc
40 130 270 410 610 830 103
0
120
0
138
0
151
0
7 ∆𝑝fan m
m
wc
930 890 885 880 860 840 790 740 680 610
8 Nactive=(C/
2)*
𝛼
W 250 270 280 315 350 390 410 430 460 480
9 Napparent=V*
A
VA 121
5
126
0
130
5
135
0
137
2.5
140
4
141
7.5
144
0
146
2.5
148
5
13. By abnetmengesh(ADDIS ABABAUNIVERSTIYINSTITUTE OFTECHNOLOGY2015)
13
Conclusion and discussion
The centrifugal fan performance tables provide the fan RPM and power requirements for
the given CFM and static pressure at standard air density. When the centrifugal fan
performance is not at standard conditions, the performance must be converted to standard
conditions before entering the performance tables. Centrifugal fans rated by the Air
0 5 10 15 20 25
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
14. By abnetmengesh(ADDIS ABABAUNIVERSTIYINSTITUTE OFTECHNOLOGY2015)
14
Movement and Control Association are tested in laboratories with test setups that simulate
installations that are typical for that type of fan. Usually they are tested and rated as one of
four standard installation types as designated in AMCA Standard 210.
AMCA Standard 210 defines uniform methods for conducting laboratory tests on housed
fans to determine airflow rate, pressure, power and efficiency, at a given speed of rotation.
The purpose of AMCA Standard 210 is to define exact procedures and conditions of fan
testing so that ratings provided by various manufacturers are on the same basis and may
be compared. For this reason, fans must be rated in standardized SCFM.
Generally from calculation and graphs we observed the fooling points:
From graph A, the cosine of the Angele and Native slightly has direct relation (.i.e.
when cosine of the angle increases and also power requirement also increases.). In
our design of the fan we must consider this relation,(we should compromise the
speed and power requirement).
From graph B, the nozzle position and the speed of the motor has direct relation.
From graph C, at lower speed there is low amount of specific energy is needed, and
then sharply increases and at higher speed the specific energy start to decrease.
From graph D, Nactive and the speed of the motor has direct relation. As the speed
increases and also the power requirement increase.
From graph E, generally as speed increases efficiency increases and after reaching
maximum efficiency point it start to decrease as speed increases.
From graph H, at very low angle the total efficiency also low, but a little increscent of
the angle increase the total efficiency very sharply and then a little incensement of
angle decreases the total efficiency very sharply. Here we observed that the angle of
rotation is the greater factor that affects the total efficiency of our flow fan, so when
we design the fan we must consider the angle of rotation greatly.