[Equest-users] Modeling VRV System

Daniel Knapp danielk at arborus.ca
Mon Mar 12 06:52:24 PDT 2012

On the subject of modelling VRF systems, I recently did some tests on a box-model in Ontario (climate zone 6) and compared the results of using PVVT and the WSHP systems.  I found that the ability to use variable speed compressors in the PVVT systems – which are not available to the WSHP systems – made a huge difference to the energy savings and that the PVVT performed much better than the WSHP.  In this case I was modelling the Mitsubishi system with no heat recovery and was using the performance curves from the “Application for Adoption of Variable Refrigerant Flow Systems Under the Tile 24-2008 Nonresidential ACM Procedures”.  

Your mileage may vary, and I would strongly recommend building a test building using the wizard that allows you to test your performance curves and VRF modelling approach to make sure you are getting the results you are looking for.  

Daniel Knapp, PhD, LEED® AP O+M
danielk at arborus.ca

Arborus Consulting
Energy Strategies for the Built Environment
76 Chamberlain Avenue 
Ottawa, ON, K1S 1V9 
Phone: (613) 234-7178 ext. 113
Fax: (613) 234-0740

On 2012-03-12, at 9:37 AM, Michael Marvin wrote:

> Hi Everyone,
> I know that there’s been some chatter about this in the past, but has anyone determined a good way to simulate a VRV system accurately in eQuest? I’ve seen posts where some people have recommended using PVVT or the Water Heat Pump System, but I’m curious to hear if anyone has found a workaround that they feel works better than the others.
> Thanks,
> Michael Marvin, LEED AP
> Buro Happold
> 100 Broadway 
> New York, NY 10005
> Tel: (+1) 212 334 2025
> Email: michael.marvin at burohappold.com
> www.burohappold.com
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