Constant speed fan exhaust systems are the most popular exhaust system in laboratory buildings since they satisfy building architectural requirement, and have low initial costs with reliable performance. The constant speed fan exhaust system maintains constant stack exit velocity to prevent toxic exhaust air downwash back to occupied areas near the building or on the roof top. To achieve constant velocity when the exhaust airflow is less than the design value, makeup air is introduced to the system at the inlet of the exhaust fan. Since the laboratory exhaust airflow is often significantly less than the design airflow, exhaust fans consume significantly more energy than is necessary. Multi-stack and Variable frequency drive techniques can reduce both the make-up airflow rate and fan energy in the constant speed fan exhaust system retrofit. This paper introduces the application principles, describes the optimal methods of stack sizing, and presents an example. The application example showed that the average annual fan power is 50% of the design fan power for a two-stack system, and 47% for a three-stack system.
Retrofit Constant Speed Fan Laboratory Exhaust Systems Using Multi-Stack and Variable Frequency Drive Techniques
Contributed by the Solar Energy Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received by the ASME Solar Energy Division, January 2002, final revision, May 2003. Associate Editor: A. Reddy.
- Views Icon Views
- Share Icon Share
- Cite Icon Cite
- Search Site
Wang , G., Liu, M., Cui , Y., and Yuill, D. (February 12, 2004). "Retrofit Constant Speed Fan Laboratory Exhaust Systems Using Multi-Stack and Variable Frequency Drive Techniques ." ASME. J. Sol. Energy Eng. February 2004; 126(1): 610–613. https://doi.org/10.1115/1.1637641
Download citation file:
- Ris (Zotero)
- Reference Manager