Determine the COP of a refrigerator that removes heat from the food compartment at a rate of 5250 kJ/h for each 1.25 kW of power it consumes. Also, determine the rate of heat rejection to the outside air.

An inventor designs a heat engine that operates between a high temperature reservoir of 800 K and a low temperature reservoir of 300 K with a heat transfer into the heat engine of 350 kW. It is claimed that 350 kW of heat is transferred to the low temperature reservoir. Is the inventor's design possible? Explain.

A heat pump maintains a dwelling at 68°F. When operating steadily, the power input to the heat pump is 7 hp, and the heat pump receives energy by heat transfer from 55°F well water at a rate of 500 Btu/min.(a) Determine the coefficient of performance.(b) Evaluating electricity at $0.08 per kW · h, determine the cost of electricity in a month when the heat pump operates for 300 hours.

A heat pump is used to extract heat from the outside atmosphere to heat the inside of a building. On a day when the outside air temperature is Tc°C, the heat pump is operating to a COP of 2.7, maintaining the inside temperature of the building at Th°C. If the building is losing heat at the rate of 62,893 kJ/hour in these conditions, determine how much power (kW) must be supplied to a heat pump.