Q: A household refrigerator runs one-fourth of the time and removes
A household refrigerator runs one-fourth of the time and removes heat from the food compartment at an average rate of 800 kJ/h. If the COP of the refrigerator is 2.2, determine the power the refrigera...
See AnswerQ: Consider an office room that is being cooled adequately by a 12
Consider an office room that is being cooled adequately by a 12,000 Btu/h window air conditioner. Now it is decided to convert this room into a computer room by installing several computers, terminals...
See AnswerQ: A house that was heated by electric resistance heaters consumed 1200 kWh
A house that was heated by electric resistance heaters consumed 1200 kWh of electric energy in a winter month. If this house were heated instead by a heat pump that has an average COP of 2.4, determin...
See AnswerQ: Refrigerant-134a enters the condenser of a residential heat pump at
Refrigerant-134a enters the condenser of a residential heat pump at 800 kPa and 35°C at a rate of 0.018 kg/s and leaves at 800 kPa as a saturated liquid. If the compressor consumes 1.2 kW o...
See AnswerQ: Why are engineers interested in reversible processes even though they can never
Why are engineers interested in reversible processes even though they can never be achieved?
See AnswerQ: A vertical piston–cylinder device contains a gas at a pressure
A vertical piston–cylinder device contains a gas at a pressure of 100 kPa. The piston has a mass of 10 kg and a diameter of 14 cm. Pressure of the gas is to be increased by placing s...
See AnswerQ: A cold canned drink is left in a warmer room where its
A cold canned drink is left in a warmer room where its temperature rises as a result of heat transfer. Is this a reversible process? Explain.
See AnswerQ: A block slides down an inclined plane with friction and no restraining
A block slides down an inclined plane with friction and no restraining force. Is this process reversible or irreversible? Justify your answer.
See AnswerQ: How do you distinguish between internal and external irreversibilities?
How do you distinguish between internal and external irreversibilities?
See AnswerQ: Consider the process of baking potatoes in a conventional oven. Can
Consider the process of baking potatoes in a conventional oven. Can the hot air in the oven be treated as a thermal energy reservoir? Explain.
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