LABORATORY SPACE PRESSURIZATION CONTROL …
July 12, 2001 11:57 AMDale T. Hitchings, PE, CIH is president of SAFELAB Corporation His firm specializes in laboratoryplanning, safety, and design; industrial ventilation; and indoor air quality consulting. He received is BSMEfrom Northwestern University in 1981 and is a Registered Professional Engineer and a Certified IndustrialHygienist Mr. Hitchings is an ASHRAE member and Chairman of the LABORATORY Systems technicalcommittee 1LABORATORY SPACE PRESSURIZATIONCONTROL SYSTEMSDale T. Hitchings, PE, CIHINTRODUCTION:Maintaining the proper differential pressure in LABORATORY spaces is one of the mostchallenging tasks facing the LABORATORY environmental CONTROL engineer. Some of theitems which need to be addressed when designing a SPACE PRESSURIZATION controlsystem are: Hazard Assessment constant -volume vs.
July 12, 2001 11:57 AM Page 3 to actively and dynamically adjust the flowrates to keep them constant and decoupled from system static pressure fluctuations.
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