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1. A building has 10 double hung windows that are each 42 inches wide and 54 inches high. Use the crack method to find

   

1. A building has 10 double hung windows that are each 42 inches wide and 54 inches high. Use the crack method to find the heat loss due to infiltration. What is the crack length, in feet, of each window? a. b. What is the total crack length for all 10 windows? C. If the infiltration rate is 0.37 cfm/ft, what is the total CFM of infiltration from all 10 windows? d. Inside temperature is 72F and outdoor temperature is 12F, using the CFM from 1.c. above, determine the heat loss due to infiltration in BTU/hr.

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