Chapter 5, Problem 5.2P

Q5: A. An engine transfers 1.5 * 103 J of energy from a hot reservoir during a cycle and transfers 1 * 103 J as exhaust to a cold reservoir.(a) Find the efficiency of the engine.(b) How much work does this engine do in one cycle?

1. Water in the rural areas is often extracted from underground water source whose free surface is 60 m below ground level. The water is to be raised 5 m above the ground by a pump. The diameter of the pipe is 10 cm at the inlet and 15 cm at the exit. Neglecting any heat interaction with the surroundings and fictional heating effects. What is the necessary power input to the pump in kW for a steady flow of water at the rate of 15 li/s? Assume pump efficiency of 74%.

3.3 Would it be possible to use a normal domestic refrigerator as a heat source for a small hot tub or whirlpool? If so, what would you estimate to be the maximum heating rate and temperature that a 300 gal whirlpool could reach using a refrigerator that is sized to use a 1 hp electric compressor designed with an evaporator temperature of 10 ° F and condensing temperature of 125 ° F?