[Equest-users] VRF Heat Recovery Calculations

[Keith Swartz]

Travis,

I have experienced negative electric consumption in an energy model, but it was in Trane TRACE 700. (The solution from CDS was to use equipment curves from a manufacturer other than Trane!) Perhaps the equipment curve is to blame in your case too.

Keith Swartz, PE
Senior Energy Engineer | Seventhwave | Madison.Chicago.Minneapolis
(formerly Energy Center of Wisconsin)
608.210.7123 | www.seventhwave.org<http://www.seventhwave.org/>

From: Travis Miller [mailto:tmiller at dcengineering.net]
Sent: Wednesday, July 29, 2015 5:22 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] VRF Heat Recovery Calculations

I have created some heat recovery calculations for a VRF system following the Energy Trust of Oregon guidelines and I am getting some underwhelming savings.

The project is a 4-story office building, one of the floors is a basement, and there is approximately 9000 SF per floor. 1 VRF air cooled unit per floor except for the third, where there are two. There might not be enough load diversity between zones to generate much heat recovery. One strange thing is that I am getting negative elec input to heat/cool numbers exported from the CSV hourly reports. Has anybody encountered this before?

I have attached my excel file for reference (sorry for the size - not sure how to compress an excel file). Any feedback would be much appreciated. Thanks in advance for your help.

Travis Miller, PE
DC Engineering
O: 406-829-8828; x. 209
123 W. Spruce ST.
Missoula, MT 59802
www.dcengineering.net

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