The walls of a refrigerator are constructed of a layer of fiberglass sandwiched

Question

The walls of a refrigerator are constructed of a layer of fiberglass sandwiched between two panels of sheet metal. Assume the fiberglass is 50 mm thick and the thermal conductivity of the fiberglass is 0.046 W/(m-K). The steel panels have k = 60 W/(m-K) and are 3 mm thick. If the interior of the refrigerator is at 4 C at the exterior air is at 25 C determine the heat flux from the room into the refrigerator if the convection coefficients are h = 5 W/(m 2 -K) on both the interior and external surfaces of the sheet metal panels

Explanation / Answer

total thermal resistance = (0.05/ 0.046)fiberglass + (2 x 0.003/ 60)steel panels + (2 /5) = 1.487

so Q = dT/R = ( 25 - 4)/ 1.487 = 14.12 W/m^2

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

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