[Equest-users] eQuest VRF question

Matthew S. Garlick msg at tbcxinc.com
Tue Mar 19 13:09:37 PDT 2019 

Thanks Bill,

That's an interesting idea, running it as air-source VRF and the water-source work-around for a comparison. Is there a report in DOE 2.3 that shows the amount of heat trading the air-source VRF system is calculating? I've done an exceptional calculation in DOE 2.2 for the USGBC presenting a 5% heating/cooling load trading as energy savings and has it be accepted, but I'd rather lean on a calculation if that's available!

[TBCx]

Matt Garlick, CxA, CEM, BEMP
Mobile: 801-907-5654



From: Bishop, Bill <bbishop at pathfinder-ea.com>
Sent: Tuesday, March 19, 2019 1:19 PM
To: Nicholas Caton <Nicholas.Caton at se.com>; Matthew S. Garlick <msg at tbcxinc.com>; Jones, Christopher <Christopher.r.Jones at wsp.com>
Cc: equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] eQuest VRF question

Christopher and Matt,
If either of you model water-cooled VRF in eQUEST/DOE-2.3 using the WSHP work-around, kindly share your experiences with the list. In particular, if you can also run an alternative system using the new air-cooled VRF capability, you can compare the water-cooled VRF workaround to the built-in air-cooled VRF and see if the results make sense. This shouldn't be too difficult as both WSHP and VRF can be modeled with PVVT systems.

All,
I'm not sure which white paper is being referred to by Matt/Mitsubishi below. It may be the Application Note 2023 that Matt shared yesterday (3/18), which is only slightly modified from an earlier version that I had dated February 2014. The revised Application Note (October 2017) is still based on DOE-2.2 and makes no acknowledgement of the new capabilities in DOE-2.3. Mitsubishi has several white papers for VRF available here:
https://www.mitsubishipro.com/white-papers
Seventhwave did an M&V study of two cold-climate water-source VRF systems, where they modeled water-to-air heat pumps using PVVT systems in eQUEST/DOE-2.2. You may find their report helpful:
https://www.seventhwave.org/publications/water-source-vrf-report

Regards,
~Bill

William Bishop, PE, BEMP, BEAP, CEM, LEED AP
Senior Energy Engineer

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From: Equest-users <equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org>> On Behalf Of Nicholas Caton via Equest-users
Sent: Tuesday, March 19, 2019 1:42 PM
To: Matthew S. Garlick <msg at tbcxinc.com<mailto:msg at tbcxinc.com>>; Jones, Christopher <Christopher.r.Jones at wsp.com<mailto:Christopher.r.Jones at wsp.com>>
Cc: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: Re: [Equest-users] eQuest VRF question

I can assert for the group my core understanding:  water-sourced VRF's are "just" very efficient water-source heatpumps.  The only substantial mechanical difference (from an energy model perspective) are

  1.  The variable speed refrigerant compressor - which can be approximated from the library defaults simply with better unitary cooling efficiency (EIR) inputs and/or revised curves
  2.  The potential for intra-zonal heat recovery between refrigeration circuits.  To my experience with water-source VRF, this is not commonly sought after in the system design / performance specifications, however this savings potential can still be approximated leveraging custom hourly outputs.

~Nick

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Nick Caton, P.E., BEMP
  Senior Energy Engineer
  Regional Energy Engineering Manager
  Energy and Sustainability Services
  Schneider Electric

D  913.564.6361
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E  nicholas.caton at schneider-electric.com<mailto:nicholas.caton at schneider-electric.com>

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From: Equest-users <equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org>> On Behalf Of Matthew S. Garlick via Equest-users
Sent: Monday, March 18, 2019 8:55 AM
To: Jones, Christopher <Christopher.r.Jones at wsp.com<mailto:Christopher.r.Jones at wsp.com>>; equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: Re: [Equest-users] eQuest VRF question


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Christopher,

Unfortunately I didn't get the white paper either (that text was copied from a chain within Mitsubishi). What Mitsubishi did provide is attached however and I included my copy of a Mitsubishi methodology in eQUEST.

Hope this helps!

[TBCx]

Matt Garlick, CxA, CEM, BEMP
Mobile: 801-907-5654


From: Jones, Christopher <Christopher.r.Jones at wsp.com<mailto:Christopher.r.Jones at wsp.com>>
Sent: Sunday, March 17, 2019 9:16 PM
To: Matthew S. Garlick <msg at tbcxinc.com<mailto:msg at tbcxinc.com>>; equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: RE: [Equest-users] eQuest VRF question

Thank you Matt,
I have used the WSHP work-around a number of times with reasonable results. At the time, VRF curves weren't available. I have done models with more detailed information using DOE2.1e with more reasonable results. I would be grateful for a copy of your white paper (the attachment didn't arrive) for an upcoming eQuest model.

Christopher R Jones, P.Eng.
T+ 1 416-644-0252

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From: Matthew S. Garlick [mailto:msg at tbcxinc.com]
Sent: Friday, March 15, 2019 5:09 PM
To: Jones, Christopher <Christopher.r.Jones at wsp.com<mailto:Christopher.r.Jones at wsp.com>>; equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: RE: [Equest-users] eQuest VRF question

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,



[Image removed by sender. TBCx]

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

E-mail: msg at tbcxinc.com<mailto:msg at tbcxinc.com>
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From: Jones, Christopher <Christopher.r.Jones at wsp.com<mailto:Christopher.r.Jones at wsp.com>>
Sent: Thursday, March 14, 2019 7:22 AM
To: equest-users at lists.onebuilding.org<mailto: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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T+ 1 416-644-0252

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