[Equest-users] eQuest VRF question

Fri Mar 15 14:09:27 PDT 2019

Christopher,

I was hoping someone else would chime in on this since it's the question I'm asking as well! Working with Mitsubishi a few months back, I got the following:

"In eQUEST, you can model water-source VRF as a standard WSHP and then choose the option for staged or multi speed compressor to approximate the performance of an inverter compressor.  Using standard WSHP definitions in eQUEST will not be far off from water-source VRF operation since water-source equipment isn't subject to the capacity de-rates air-source VRF is subject to, so essentially the variable speed nature of the compressor is the only thing that is missing to properly model water-source VRF.

Additionally, in eQUEST the EIR (energy input ratio - described in the first attachment) has an overwhelming impact on the resulting energy performance - much more so than the capacity and part-load curves.  Since the EIR is calculated and entered for each specific condenser being modeled, this should reflect water-source VRF operation with a reasonable degree of accuracy.

We could update the attached white paper and associated eQUEST curves to include water-source VRF, however, most open source energy modeling is now trending toward Energy Plus and the various interfaces that run this engine like OpenStudio."

Talking to Doug Maddox who helped develop the air source VRF in DOE 2.3, he said he thought that approach is reasonable.

Please let me know if you find anything else, I've got a big water source VRF model in my near future!

Best,

[TBCx]

Matt Garlick, CxA, CEM, BEMP
Building Efficiency Engineer | TBCx

E-mail: msg at tbcxinc.com<mailto:msg at tbcxinc.com>
Mobile: 801-907-5654
Direct: 801-401-8456

324 S. State Street, Suite 400
Salt Lake City, UT 84111
www.tbcxinc.com<http://tbcxinc.com/>

From: Jones, Christopher <Christopher.r.Jones at wsp.com>
Sent: Thursday, March 14, 2019 7:22 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] eQuest VRF question

Is it possible to model a water-source VRF system? Typically these systems have a source/sink water loop similar to a water-source heat pump loop with a boiler and fluid cooler. I did RTFM and it appears that only an air cooled condenser is available for the VRF system at this time.

In the past, I used the water-source heat pump system to approximate a water-source VRF system. It looks like I will have to use that strategy with DOE2.3.

Christopher R. Jones, P.Eng.
Senior Building Performance Specialist
Sustainability & Energy

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