[Bldg-sim] Really quick question

[Michael A. Eustice]

If I understand you correctly, you ran both the lighting EEM and the weather stripping EEM separately.  In the lighting EEM, the gas savings got worse.  In the weather stripping EEM, the gas savings got better.

Then you manually added the two together, for a net gain of gas savings (the gas savings from the weather stripping more than compensated for the gas consumption increase from the lighting EEM).

But when you run the two simultaneously, you get a different savings number.  One that is better, for increased gas savings.  You're wondering why.

I'm pretty sure it's because when you improved the envelope, the gas increase from the lighting reduction is not as significant.  In your first run (individually) the gas increase from the lighting reduction is occurring within a lousy envelope.  In the simultaneous run, the gas increase from the lighting reduction is occurring within a good envelope building, so the increase is now not as drastic.  Make sense?

Michael

From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Cheney
Sent: Tuesday, November 09, 2010 2:03 PM
To: John Aulbach
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Really quick question

I guess it is because the lighting generates internal loads which will benefit heating in winter. The reduction of lighting will reduce the internal loads which is more predominant than the savings from infiltration. Then you got higher gas requirement in your model.

Cheney
On Tue, Nov 9, 2010 at 10:36 AM, John Aulbach <jra_sac at yahoo.com<mailto:jra_sac at yahoo.com>> wrote:

I am doing EEM modeling, with both gas and electric effects on a multi family unit in Los Angeles.



One EEM is a lighting reduction. Another is weather stripping, which reduces infiltration.



I add up the EEMs individually and get a gas savings (negative from the lighting reduction obviously). I add them together in a COMBO run (where they interact) and the gas savings goes UP !!



WHY !!!!


John R. Aulbach, PE, CEM
Senior Energy Engineer
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