In Winter, the building is surrounded by temperature of around zero degree, plus minus five to ten degrees. With good insulation on the walls and ceilings the heat transfer through these surfaces is small compared with the available heat source of the sun beam.
The sun is still providing the beam at 400 W/sq.meter. This is why a Southerly facing room with bay windows can be quite warm in Winter without much heating.
I do not know the exact condition of your building. As a whole, the modern buildings in North America are designed for "comfort" and not for energy saving.
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: nfbuckley@xxxxxxxxx
Date: Mon, 31 Jan 2011 18:27:01 +0000
Subject: [EnergyPlus_Support] Very high solar gain for single pane windows
I am running some calculations for single pane windows with extremely high u-values and high shgc values (6 W/m2-K and 0.78 respectively). When I run the simulations in cold weather areas (i.e. Colorado Springs), I would expect the conductive loss to far outweigh the solar gain. However, I am experiencing very low total heat loss in Dec., Jan., and Feb. and am actually gaining heat the rest of the year. In January, the coldest month, the windows represent less than 2% of the total load even though there is 270 square feet of window against 1344 square feet of wall. These results run counter to what I would expect. Am I missing something here? Are these the type of results I should expect?
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