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Indoor temps seem high compared to outdoor air - older existing residential

asked 2019-10-14 14:21:38 -0500

Emcalvin's avatar

updated 2020-01-15 14:05:49 -0500

Hi, I’m working on a model of an existing residential building, my first, on which I would like to model retrofits. But I’m having trouble with the first step, modeling the building as-is. The output doesn’t look right. The indoor temperatures seem too high. Indoors is 16° hotter than outdoors (average daily max temp, annual basis). It shows the indoor temperature being higher than the air outdoors all year round, when experience tells that poorly insulated homes here in Los Angeles tend to be colder than the outdoors as soon as the weather turns cool. The 16° difference in daily max temp masks even larger differences the model indicates throughout the day. The photo below shows this.

Below that photo is the same scenario, using CA climate zones instead of U.S. I am hesitant to go forward and model the retrofits that interest me when the baseline scenario does not seem right. I am grateful for any advice and thank anyone who has taken the time to read this.

image description

image description

About the house being modeled:

-1500 square feet -Uninsulated -Single-pane windows -Gable 5/12 roof -Built 1928 -Faces Northeast -Location Los Angeles -Neighbors 15’ away on either side

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answered 2021-05-09 19:14:07 -0500

yolotom's avatar

Hi EMCalvin any luck solving this problem?

BTW, how did you produce those indoor & outdoor temperature charts above? I am interested in accessing indoor Thermal metrics in BeOpt, having already done the energy optimization for a new SFam in CA. We also used the CBECC model to get hourly indoor thermal parameters.

Tom Phillips Davis, CA

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Asked: 2019-10-14 14:21:38 -0500

Seen: 168 times

Last updated: May 09 '21