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Energies 2015, 8(7), 6566-6584; doi:10.3390/en8076566

Design and Experimental Analysis of an Exhaust Air Energy Recovery Wind Turbine Generator

Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
UM Power Energy Dedicated Advanced Centre, University of Malaya, Level 4, Wisma R&D, Jalan Pantai Baharu, 59990 Kuala Lumpur, Malaysia
Author to whom correspondence should be addressed.
Academic Editor: Hossam A. Gabbar
Received: 5 May 2015 / Revised: 12 June 2015 / Accepted: 17 June 2015 / Published: 30 June 2015
(This article belongs to the Special Issue Energy Conservation in Infrastructures)
View Full-Text   |   Download PDF [1304 KB, uploaded 30 June 2015]   |  


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. View Full-Text
Keywords: building integrated wind turbine; exhaust air system; energy savings; clean energy; urban wind energy building integrated wind turbine; exhaust air system; energy savings; clean energy; urban wind energy

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Fazlizan, A.; Chong, W.T.; Yip, S.Y.; Hew, W.P.; Poh, S.C. Design and Experimental Analysis of an Exhaust Air Energy Recovery Wind Turbine Generator. Energies 2015, 8, 6566-6584.

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