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Simulating the Effects of HVAC Induced Air Flow From Slot Diffusers on Detector Response.


pdf icon Simulating the Effects of HVAC Induced Air Flow From Slot Diffusers on Detector Response. (15967 K)
Klote, J. H.; Forney, G. P.; Davis, W. D.; Bukowski, R. W.

NISTIR 5908; 79 p. December 1996.

Sponsor:

National Fire Protection Assoc., Quincy, MA

Available from:

National Technical Information Service (NTIS), Technology Administration, U.S. Department of Commerce, Springfield, VA 22161.
Telephone: 1-800-553-6847 or 703-605-6000;
Fax: 703-605-6900.
Website: http://www.ntis.gov
Order number: PB97-132393

Keywords:

heating; ventilation; air conditioning; fire models; smoke detectors

Abstract:

Rapid activation of fire protection systems in response to a growing fire is one of the important factors required to provide for life safety and property protection. Airflow due to the heating, ventilating and air conditioning (HVAC) system can significantly modify the flow of smoke along the ceiling and must be taken into consideration when a particular system is designed. At present, the standards used to guide the design of systems contain very little quantitative information concerning the impact of airflow produced by HVAC systems. This project is part of a multi year, International Fire Detection Research Project sponsored by the National Fire Protection Research Foundation (NFPFR), and it describes the results of a series of numerical simulations of smoke movement in response to HVAC flows resulting from slot diffusers, slot returns and rectangular returns. The computer model calculated activation times throughout the fire driven flow field.