The rate of energy transfer through the windowpane.

Question

The surface area of an adult human is about 1.8 m2. Suppose a person with a skin temperature of 34°C is standing with bare skin in a room where the air is 25°C but the walls are 17°C.a. There is a “dead-air” layer next to your skin that acts as insulation. If the dead-air layer is 5.0 mm thick, what is the person’s rate of heat loss by conduction?b. What is the person’s net radiation loss to the walls? The emissivity of skin is 0.97.c. Does conduction or radiation contribute more to the total rate of energy loss?d. If the person is metabolizing food at a rate of 155 W, does the person feel comfortable, chilly, or too warm?

Answer 1

Question

Chapter 21, Problem 85PQ

(a)

To determine

The rate of energy transfer through the windowpane.

(b)

To determine

The energy transferred through the windowpane during 6.00 h.

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