Our maintenance guru provided these comments based on experience with both type of systems at our facility.
The variable volume system can have better temperature control room to room provided that a control box is dedicated to each room. However, if you have a given variable volume control box feeding two rooms, where one room has a heat-producing device, and the other does not, you will struggle with one room being too hot or too cold. This struggle to balance temperatures in multiple rooms is worsened in some rooms because there are more rooms on a given “control box” (ie: rooftop HVAC unit). And if the heat-producing load itself is variable, there are bound to be problems. I would say we do a fair job on temperature control in the labs. I think a variable volume scheme would be better. The time to implement variable is at initial construction time. Retrofitting can be very expensive, I think.
Wayne D. Niemeyer | Senior Research Scientist
[Title: McCrone Associates, Inc. - Description: McCrone Associates, Inc.]
McCrone Associates, Inc. • 850 Pasquinelli Drive • Westmont, IL 60559
P. 630.887.7100 ext.2420 | F. 630.887.7417 | www.mccrone.com<http://www.mccrone.com/>
ISO/IEC 17025:2005 A2LA Accredited, Certificate #3631.01<http://www.mccroneassociates.com/sites/default/files/A2LA_Cert_3631-01.pdf> • FDA/GDUFA/DEA Registered<http://www.mccroneassociates.com/quality-program>
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From: JEOL-Focused Probe Users List [mailto:[log in to unmask]] On Behalf Of Anette von der Handt
Sent: Wednesday, June 07, 2017 12:00 PM
To: [log in to unmask]
Subject: [PROBEUSERS] EPMA Labs HVAC: Constant air volume vs variable air volume
I am looking for people who could share their experience with constant air volume HVAC systems and temperature stability in their lab and see if anyone upgraded their constant air volume system to a variable air volume system.*
Any information is welcome. Thanks!
* I want variable air volume and it turns out I am getting constant air volume. I hate our architects with the fire of a thousand suns.
Dr. Anette von der Handt
Department of Earth Sciences
University of Minnesota
310 Pillsbury Drive SE
Minneapolis, MN 55455
Office phone: (612) 624-7370
Office fax: (612) 625-3819
Lab phone: (612) 624-3539
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