Can EnergyPlus model DCV for part of an air loop?

asked 2014-11-19 10:09:57 -0500

MatthewSteen

10077 ●18 ●25 https://www.nrel.gov/b...

updated 2015-07-26 19:06:57 -0500

__AmirRoth__

4436 ●5 ●17 http://bleedinggreenna...

It's been my experience that there's often a zone or space within a zone that either requires DCV in the baseline model per 90.1 or is part of the design in the proposed model (usually conference rooms). Unfortunately in OpenStudio, and as far as I can tell EnergyPlus, DCV can only be enabled at the system level - i.e. AirLoopHVAC. There are workarounds one could do such as post processing or separating the zone into its own air loop, but I'd like to know if there's an EP object for this that I'm not aware of - e.g. one to connect air loops.

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answered 2014-11-19 11:02:56 -0500

Archmage

7185 ●3 ●11

If you have VAV terminals, you can use the terminal's local control for outdoor air with the DesignSpecification:OutdoorAir setup for DCV. Of course there can only be one OA fraction for the air handler so this will really adjust the damper minimum stop for DCV zones. You'll want to use the DesignSpecification:OutdoorAir for the non-DCV zones as well for a fair comparison.

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answered 2014-11-19 13:50:54 -0500

TaylorRoberts

2903 ●1 ●2 ●13 http://www.group14eng.com/

I have also ran into this issue in OpenStudio while doing a LEED project and was wondering if there is a way in OS. When you select demand controlled ventilation in OS it assigns DesignSpecification:OutdoorAir for all of the zones on the AHU. As of now, the only way I have been able to do this is if one zone calls for DCV I provide it to the whole system.