design temperature

We Are the 99% — AND the 1%

Posted on January 30,2015 by ab3 in cooling load

We're making progress! With the all the emphasis on energy codes and energy efficiency programs like Energy Star New Homes, more homes are getting Manual J heating and cooling load calculations these days. The intent is for the heating and cooling systems to be sized properly because oversized systems have problems (poor dehumidification, short cycling...).

How to Perform a Heat-Loss Calculation — Part 2

Posted on January 30,2015 by user-756436 in design temperature

To continue last week’s discussion of heat-loss calculation methods, let’s consider a simple rectangular building, 20 feet by 30 feet, with 8-foot ceilings. Let’s assume it has an 8-foot-high basement with uninsulated concrete walls; the below-grade portion of the basement is 7 feet high, with 1 foot above grade. To keep things simple, we’ll assume that the house has a flat roof, and that each side of the house has two windows (each 3 ft. by 4 ft.) and one door (3 ft. by 7 ft.). The house doesn’t have a chimney.

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