Variable-Frequency Drive Applications in Nonmakeup-Air Exhaust Systems
Publication: Journal of Architectural Engineering
Volume 9, Issue 4
Abstract
The constant-speed fan wastes fan energy and causes excessive noises in nonmakeup-air exhaust systems, where stack-exit velocity decreases proportionally to the laboratory exhaust airflow. A variable-frequency drive (VFD) can maintain the required static pressure at the fume hoods by modulating the fan speed. The VFD reduces the fan power and eliminates the noise problems. A theoretical study has been conducted to investigate the system performance of the constant fan nonmakeup-air exhaust system, the impacts of the VFD, and the optimal VFD control for multiple-stack systems. The results show that the VFD can potentially reduce annual fan energy of the constant-speed fan nonmakeup-air exhaust systems by as much as 51%.
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References
American Society of Heating, Refrigeration and Air-conditioning Engineering, Inc. (ASHRAE). (1999). HVAC Applications, Atlanta.
Wang, G., and Liu, M. (2001). “Energy efficient single stack exhaust fan systems (E3S3F).” Proc., Int. Conf. for Enhanced Building Operations, Austin, Tex.
Wang, G., Cui, Y., Yuill, D., and Liu, M. (2002a). “Development of multi-stack exhaust systems for laboratory buildings.” Proc., ASME Solar Energy Conf., American Society of Mechanical Engineers, New York.
Wang, G., Cui, Y., Yuill, D., and Liu, M. (2002b). “Optimization of multi-stack exhaust systems—New system design application.” Symp., Improving Building Systems in Hot and Humid Climates, Houston.
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Information
Published In
Journal of Architectural Engineering
Volume 9 • Issue 4 • December 2003
Pages: 134 - 140
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Nov 6, 2002
Accepted: Sep 2, 2003
Published online: Nov 14, 2003
Published in print: Dec 2003
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