An egg hatchery is preparing to renovate its egg holding room. The room is insul

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 3.1 inches of fiberglass insulation (k=0.318 BTU inch/(hr ft2 F)) versus 3.3 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) = [Num]BTU/hr ft2

Heat Transfer Rate (Polystyrene) = [Num]BTU/hr ft2

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 3.1 inches of fiberglass insulation (k=0.318 BTU inch/(hr ft2 F)) versus 3.3 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) = [Num]BTU/hr ft2

Heat Transfer Rate (Polystyrene) = [Num]BTU/hr ft2

Explanation / Answer

apply the rate of heat transfer H = KA(T2-T1)/L

80 deg F = 26.67 deg C

40 deg F = 4.44 deg C

so

Hfiber glass = 0.318 *(26.67-4.44)/3.1

Hfiber   = 2.28 BTU/hr ft2

----------------

Hpoly = 0.2* (26.67   - 4.44)/(3.3)

H poly = 1.347 BTU/hr ft2

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.