Question

A) A steam engine (assume a Carnot engine ) has an efficiency of 62.9%. If the...

A) A steam engine (assume a Carnot engine ) has an efficiency of 62.9%. If the waste heat has a temperature of 13.5◦C, what is the temperature of the boiler?

Answer in units of ◦C.

B) The interior of a refrigerator has a surface area of 2.4 m2. It is insulated by a 3 cm thick material that has a thermal conductivity of 0.0222 J/m · s ·◦ C. The ratio of the heat ex- tracted from the interior to the work done by the motor is 4.8% of the theoretical maxi- mum. The temperature of the room is 35.5◦C, and the temperature inside the refrigerator is 8.5◦C. Determine the power required to run the compressor.

Answer in units of W.

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