How to Model a Water-cooled Condensing Unit

asked 2016-07-07 10:58:49 -0600

lyw0211
429 ●7

updated 2016-07-07 11:28:06 -0600

__AmirRoth__

4446 ●5 ●17 http://bleedinggreenna...

I would like to use OpenStudio or EnergyPlus to model a water-cooled condensing unit. Based on that, I need to directly connect the cooling coil of air loop to the condensing water loop. However, the only choice for me right now is the water-to-air heat pump. The problem of this method is that I need to size the heating capacity zero. Is there any better way to model the condensing unit? Does EnergyPlus/OpenStudio has the unit called condensing unit? Does anyone has the similar experience in modeling condensing unit?

answered 2016-07-07 16:40:01 -0600

Julien Marrec

29726 ●94 ●76 http://www.effibem.com/

updated 2016-07-07 16:42:12 -0600

Wrap a Coil:Cooling:WaterToAirHeatPump inside an AirLoopHVAC:UnitarySystem and place that on the supply side on your air loops. You'll need to use the API to create these objects.

There are two schools of thoughts as to how you should do this: either you include the fan, and a potential heating coil inside the UnitarySystem, or you just wrap each component individually in an UnitarySystem (for example two unitarysystem, one for the cooling coil and one for the heating coil) and place a SetpointManager on the outlet of each.

There are a couple of threads on Unmet Hours that talk about this subject: