[Equest-users] PV inverter heat?

[Nicholas Caton via Equest-users]

Crazy talk!  (and I mean that in the most positive way!)

If you set up everything perfectly, I don't reckon the solar gain would track perfectly with the heat output of the inverter however... if you think of this window oriented to match the PV array panels, they are making some juice (and waste heat) when there isn't a "direct solar gain" but they're still getting energy when the sun is out of the line of sight.  I imagine there's some degree of "standby" power / heat gain as well when the PV panels are asleep at night.

Still set up well it could be a decent & quick stand-in for a more laborious 8760 schedule calculation to crunch and push into the model.

Once upon a time I lamented that transformers losses specified at the meter in eQUEST can't be attributed to a space/zone... Didn't foresee this potential application as I was focused on quantifying "premium efficiency" transformer savings, but alas I suspect that feature remains on the back burner.

[cid:image001.png at 01D2937C.5F1F99E0]
Nick Caton, P.E., BEMP
  Senior Energy Engineer
  Regional Energy Engineering Manager
  Energy and Sustainability Services
  Schneider Electric

D  913.564.6361
M  785.410.3317
F  913.564.6380
E  nicholas.caton at schneider-electric.com<mailto:nicholas.caton at schneider-electric.com>

15200 Santa Fe Trail Drive
Suite 204
Lenexa, KS 66219
United States

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From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Bishop, Bill via Equest-users
Sent: Friday, February 24, 2017 11:50 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] PV inverter heat?

I'm working on a small net-positive-energy project in New York and considering all low-energy options for heating the building. It will have a PV system and I'd like to model waste heat from the inverter to consider putting it indoors. The waste heat would be a sensible heat gain that varied with solar radiation. (The greater the solar radiation, the higher the PV output and the more waste heat off the inverter, on the order of 400 watts for an 8 kW system.) I'm thinking of modeling the inverter as a south-facing window since heat gain to the space would vary with solar radiation. The trick would be to zero out as much as possible the window thermal conductance or make it equal to the outside wall value.
Thoughts?

Thanks,
~Bill

William Bishop, PE, BEMP, BEAP, CEM, LEED AP | Pathfinder Engineers & Architects LLP
Senior Energy Engineer

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134 South Fitzhugh Street                 Rochester, NY 14608

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bbishop at pathfinder-ea.com<mailto:wbishop at pathfinder-ea.com>             www.pathfinder-ea.com<http://www.pathfinder-ea.com/>

[http://png-5.findicons.com/files/icons/977/rrze/720/globe.png]Carbon Fee and Dividend - simple, effective, and market-based.



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