Question

An egg hatchery is preparing to renovate its egg holding room. The room is insulated and cooled to 40 degrees F. They want to compare the rate of heat gain through the room wall when insulate with 3 inches of fiberglass insulation (k=0.318 BTU inch/(hr ft2 F)) versus 3.7 inches of polystyrene (k=0.2 BTU inch/(hr ft2 F)). Determine the heat transfer rate for each material for the two wall types if the outside temperature is 80 degrees F.

Heat Transfer Rate (Fiberglass) = 2.35 BTU/hr ft2 Heat -wrong

Transfer Rate (Polystyrene) = 1.20 BTU/hr ft2 -wrong

Answer 1

For Fiberglass insulation rate of heat transfer is,

Here 3 inch = 0.25 foot has been used.

For Polystyrene material, rate of heat transfer would be,

Here, 3.7 inch = 0.31 foot has been used.