[Bldg-sim] Really quick question

Mehta, Gaurav Gaurav.Mehta at stantec.com
Tue Nov 9 11:28:00 PST 2010


My guess is that lighting reduction EEM works only during day time and has hardly any or no effect during when the occupants are sleeping (obviously depends on the lighting schedules).

Infiltration (again depending on the schedules) works all throughout the day. And specially results in gas savings during night time when the outside air is cold. However, it does have some effect during day time as well.

It seems that in the combo case during the day time, the reduced OA (due to infiltration) is offsetting the penalty in the space heating due to reduced LPD.

To explain it further:

In the reduced infiltration case the savings in heating energy during the day time do not show up because the excessive Lighting is taking care of it.
However, in the Combo case the reduced infiltration shows even more savings and surpasses the penalty in heating energy due to reduced lighting because the OA load during the day time is larger than the penalty. And when the OA is reduced during the day time as well as the night time, larger savings are seen. Does that make sense?

Gaurav Mehta, LEED® AP BD+C
Sustainable Building Analyst
Stantec
1932 First Avenue Suite 307
Seattle WA 98101
Ph: (206) 770-7779
Fx: (206) 770-5941
Gaurav.Mehta at stantec.com<mailto:Gaurav.Mehta at stantec.com>
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From: bldg-sim-bounces at lists.onebuilding.org<mailto:bldg-sim-bounces at lists.onebuilding.org> [mailto:bldg-sim-bounces at lists.onebuilding.org]<mailto:[mailto:bldg-sim-bounces at lists.onebuilding.org]> On Behalf Of John Aulbach
Sent: Tuesday, November 09, 2010 10:36 AM
To: bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>
Subject: [Bldg-sim] Really quick question


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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Partner Energy
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