Not always sunny, curtains usually open, majority of windows get sun during hot parts of day, use 60 btu/hr / square foot of window. Use 60 btu/hr / square foot of window, and skip the rest.Īlways sunny, curtains usually open, majority of windows get sun during hot parts of the day, use 120 btu/hr / square foot of window.Īlways sunny, curtains usually shut, majority of windows don't get sun during hot parts of day, use 60 btu/hr / square foot of window. The theoretical model and calculation of this number is so complex that you might just want some rules of thumb. Of course your air conditioner must also remove heat that conducts through the walls, etc. Then you multiply by the total square feet of windows and you know how many btu's per hour are coming in, and therefore how many btu's per hour your air conditioner must have to remove that heat. The simple number we would like is a number of btu's per hour per square foot of window. When designing how large an air conditioning system should be, one of the factors to consider is how much heat is coming from the sun shining through the window glass.
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