A heat engine receives heat from a source at 1500 K at a rate of 600 kJ/s and rejects the waste heat to a sink at 300 K. If the power output of the engine is 400 kW, the second-law efficiency of this heat engine is (a) 42% (b) 53% (c) 83% (d) 67% (e) 80%

It is claimed that a certain cyclical heat engine operates between the temperatures of TH = 460°C and TC = 153°C and performs W = 4.1MJ of work on a heat input of QH = 5.05 MJ. - How much heat, in megajoules, would be discharged into the low-temperature reservoir?

The engine of a large ship does 1.90 ✕ 108 J of work with an efficiency of 4.05% (a) How much heat transfer (in J) occurs to the environment?   (b) How many barrels of fuel are consumed, if each barrel produces 6.00 ✕ 109 J of heat transfer when burned?

(a) What is the best coefficient of performance for a heat pump that has a hot reservoir temperature of 59.3°C and a cold reservoir temperature of -12.7°C? (b) How much heat in kilocalories would it pump into the warm environment if 3.60 x 10' ) of work (10.0 kw · h) is put into it? kcal (c) Assume the cost of this work input is 10c/kW · h. Also assume that the cost of direct production of heat by burning natural gas is 85.0c per therm (a common unit of energy for natural gas), wher a therm equals 1.055 x 108 J. Compare the cost of producing the same amount of heat by each method. cost of heat pump cost of natural gas Additional Materials OReading