Design and Experimental Analysis of an Exhaust Air Energy Recovery Wind Turbine Generator
A vertical axis wind turbine (VAWT) was positioned at the discharge outlet of a cooling tower electricity generator. To avoid a negative impact on the performance of the cooling tower and to optimize the turbine performance, the determination of the VAWT position in the discharge wind stream was con...
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doaj-a462bc3014744ea98b21278f593530182020-11-25T00:44:47ZengMDPI AGEnergies1996-10732015-06-01876566658410.3390/en8076566en8076566Design and Experimental Analysis of an Exhaust Air Energy Recovery Wind Turbine GeneratorAhmad Fazlizan0Wen Tong Chong1Sook Yee Yip2Wooi Ping Hew3Sin Chew Poh4Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, MalaysiaDepartment of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, MalaysiaUM Power Energy Dedicated Advanced Centre, University of Malaya, Level 4, Wisma R&D, Jalan Pantai Baharu, 59990 Kuala Lumpur, MalaysiaUM Power Energy Dedicated Advanced Centre, University of Malaya, Level 4, Wisma R&D, Jalan Pantai Baharu, 59990 Kuala Lumpur, MalaysiaDepartment of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, MalaysiaA vertical axis wind turbine (VAWT) was positioned at the discharge outlet of a cooling tower electricity generator. To avoid a negative impact on the performance of the cooling tower and to optimize the turbine performance, the determination of the VAWT position in the discharge wind stream was conducted by experiment. The preferable VAWT position is where the higher wind velocity matches the positive torque area of the turbine rotation. With the proper matching among the VAWT configurations (blade number, airfoil type, operating tip-speed-ratio, etc.) and exhaust air profile, the turbine system was not only able to recover the wasted kinetic energy, it also reduced the fan motor power consumption by 4.5% and increased the cooling tower intake air flow-rate by 11%. The VAWT had a free running rotational speed of 479 rpm, power coefficient of 10.6%, and tip-speed-ratio of 1.88. The double multiple stream tube theory was used to explain the VAWT behavior in the non-uniform wind stream. For the actual size of a cooling tower with a 2.4 m outlet diameter and powered by a 7.5 kW fan motor, it was estimated that a system with two VAWTs (side-by-side) can generate 1 kW of power which is equivalent to 13% of energy recovery.http://www.mdpi.com/1996-1073/8/7/6566building integrated wind turbineexhaust air systemenergy savingsclean energyurban wind energy |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ahmad Fazlizan Wen Tong Chong Sook Yee Yip Wooi Ping Hew Sin Chew Poh |
spellingShingle |
Ahmad Fazlizan Wen Tong Chong Sook Yee Yip Wooi Ping Hew Sin Chew Poh Design and Experimental Analysis of an Exhaust Air Energy Recovery Wind Turbine Generator Energies building integrated wind turbine exhaust air system energy savings clean energy urban wind energy |
author_facet |
Ahmad Fazlizan Wen Tong Chong Sook Yee Yip Wooi Ping Hew Sin Chew Poh |
author_sort |
Ahmad Fazlizan |
title |
Design and Experimental Analysis of an Exhaust Air Energy Recovery Wind Turbine Generator |
title_short |
Design and Experimental Analysis of an Exhaust Air Energy Recovery Wind Turbine Generator |
title_full |
Design and Experimental Analysis of an Exhaust Air Energy Recovery Wind Turbine Generator |
title_fullStr |
Design and Experimental Analysis of an Exhaust Air Energy Recovery Wind Turbine Generator |
title_full_unstemmed |
Design and Experimental Analysis of an Exhaust Air Energy Recovery Wind Turbine Generator |
title_sort |
design and experimental analysis of an exhaust air energy recovery wind turbine generator |
publisher |
MDPI AG |
series |
Energies |
issn |
1996-1073 |
publishDate |
2015-06-01 |
description |
A vertical axis wind turbine (VAWT) was positioned at the discharge outlet of a cooling tower electricity generator. To avoid a negative impact on the performance of the cooling tower and to optimize the turbine performance, the determination of the VAWT position in the discharge wind stream was conducted by experiment. The preferable VAWT position is where the higher wind velocity matches the positive torque area of the turbine rotation. With the proper matching among the VAWT configurations (blade number, airfoil type, operating tip-speed-ratio, etc.) and exhaust air profile, the turbine system was not only able to recover the wasted kinetic energy, it also reduced the fan motor power consumption by 4.5% and increased the cooling tower intake air flow-rate by 11%. The VAWT had a free running rotational speed of 479 rpm, power coefficient of 10.6%, and tip-speed-ratio of 1.88. The double multiple stream tube theory was used to explain the VAWT behavior in the non-uniform wind stream. For the actual size of a cooling tower with a 2.4 m outlet diameter and powered by a 7.5 kW fan motor, it was estimated that a system with two VAWTs (side-by-side) can generate 1 kW of power which is equivalent to 13% of energy recovery. |
topic |
building integrated wind turbine exhaust air system energy savings clean energy urban wind energy |
url |
http://www.mdpi.com/1996-1073/8/7/6566 |
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