1 the 2nd law of thermodynamics refers to the quality of energy 2 work
1. The 2nd law of thermodynamics refers to the quality of energy. 2. Work can convert to heat completely, but heat cannot convert to work completely. 3. The efficiency of a heat engine can be greater than 1. 4. According to Clausius, heat can transfer naturally from cold bodies to hot bodies. 5. The second-law efficiency of a heat engine is always greater than its thermal efficiency. 6. Both the first and second laws of thermodynamics must be satisfied in any real system. 7. The Carnot COP of a heat pump running between 7°C and 23°C is 8. Heat engines with the same 1s* law efficiency will always have the same 2nd law efficiency. 9. An inventor claims to have created a heat engine that produces 10 kW of power for a 15 kW power input, while operating between temperature reservoirs at 27°C and 427°C. Is this claim valid? 10. A manufacturer claims that their refrigerator has a COP of 10 while running between a conditionedspace at 0°C and ambient air at 23°C. Is this claim valid? 11. A heat pump supplies heat to a house at a rate of 30,000 kJ/hr. If the power consumed by the heat pump is 3 kW, determine the coefficient of performance of the heat pump. 12. A Carnot heat engine receives heat from a source at 800°C and rejects heat to a sink at 40°C. The heat is rejected from this engine at a rate of 80 kJ/s. Determine the power output, in kW. 13. An air-conditioner removes heat from a room at 20°C at a rate of 9000 kJ/hr and rejects the heat to the outdoor air at 35°C. If the coefficient of performance of the air-conditioner is 3, determine: a. The power consumed by the air-conditioner. b. The minimum power required if the system is reversible. 14. An A/C unit removes heat from the house at a rate of 1 MJ/min. If the required power input to thisA/C unit is 6 kW, determine: COP of the air-conditioning unit. b. The rate of heat rejection to the outside air, in kW. 15. A heat pump absorbs heat from the cold outdoors at 2° C and supplies heat to a house at 23° C at a rate of 36,000 kJ/hr. a. What is the COP of the heat pump if the power consumed is 1.7 kW? b. What is the maximum COP of the heat pump?
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