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An electric kitchen range has a total wall area of 1.40 m2
Chapter 17, Problem 66E(choose chapter or problem)
An electric kitchen range has a total wall area of \(1.40\ \text{m}^2\) and is insulated with a layer of fiberglass 4.00 cm thick. The inside surface of the fiberglass has a temperature of \(175^{\circ}\text{C}\), and its outside surface is at \(35^{\circ}\text{C}\). The fiberglass has a thermal conductivity of \(0.04\ \text{W/m}\cdot \text{K}\).
(a) What is the heat current through the insulation, assuming it may be treated as a flat slab with an area of \(1.40\ \text{m}^2\)?
(b) What electric-power input to the heating element is required to maintain this temperature?
Questions & Answers
QUESTION:
An electric kitchen range has a total wall area of \(1.40\ \text{m}^2\) and is insulated with a layer of fiberglass 4.00 cm thick. The inside surface of the fiberglass has a temperature of \(175^{\circ}\text{C}\), and its outside surface is at \(35^{\circ}\text{C}\). The fiberglass has a thermal conductivity of \(0.04\ \text{W/m}\cdot \text{K}\).
(a) What is the heat current through the insulation, assuming it may be treated as a flat slab with an area of \(1.40\ \text{m}^2\)?
(b) What electric-power input to the heating element is required to maintain this temperature?
ANSWER:
Step 1 of 3
Given data:
The total area of the wall is 
The thickness of the glass is 
The temperature of the inside surface of fiberglass is 
The temperature of the outside surface of fiberglass is 
The thermal conductivity of the glass is 