[Equest-users] Single zone VAV with chilled water cooling

Chapin, Alex N Alex.Chapin at masonandhanger.com
Tue Feb 18 04:23:53 PST 2020

Hi Steve,

I just tried modeling a system type “Variable Air Volume” or VAVS with just one zone attached to it and chilled water cooling and I think that should do what you want. You just might need to adjust the “Maximum Cooling Reset Temp” up to a higher value if you get simultaneous heating and cooling.


From: Steve Jacobs [mailto:sjacobseng at gmail.com]
Sent: Monday, February 17, 2020 5:13 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Single zone VAV with chilled water cooling

I am trying to model a building that uses single zone systems with variable speed setbacks and chilled water cooling. I was under the impression that the best way to model this would be to use the single zone reheat system type and then lower the minimum flow ratio. When I look at the hourly reports, eQuest is only reducing the airflow below the maximum when there is a heating load in on the system. When the space is in cooling, or when there is no call for heating or cooling, it is running at the maximum airflow. Is there a way to get around this? What system type is best to model a single one VAV with chilled water cooling?

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