Heat Gain The following graphs show the typical heat gain, in BTU per hour per square foot, for windows (one with plain glass and one that is triple glazed) in Pittsburgh in June, one facing east and one facing south. The horizontal axis gives the time of the day. Estimate the total heat gain per square foot by summing the areas of rectangle. Use rectangles with widths of
a. Estimate the total heat gain per square foot for a plain glass window facing east.
b. Estimate the total heat gain per square foot for a triple glazed window facing east.
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