Q: A heat pump has a COP of 1.7. Determine
A heat pump has a COP of 1.7. Determine the heat transferred to and from this heat pump when 50 kJ of work is supplied.
See AnswerQ: A heat pump with a COP of 1.4 is to
A heat pump with a COP of 1.4 is to produce a 100,000 Btu/h heating effect. How much power does this device require, in hp?
See AnswerQ: An air conditioner removes heat steadily from a house at a rate
An air conditioner removes heat steadily from a house at a rate of 750 kJ/min while drawing electric power at a rate of 5.25 kW. Determine (a) the COP of this air conditioner and (b) the rate of heat...
See AnswerQ: A household refrigerator that has a power input of 450 W and
A household refrigerator that has a power input of 450 W and a COP of 1.5 is to cool 5 large watermelons, 10 kg each, to 8°C. If the watermelons are initially at 28°C, determine how long it will take...
See AnswerQ: A vertical, frictionless piston–cylinder device contains a gas at
A vertical, frictionless piston–cylinder device contains a gas at 180 kPa absolute pressure. The atmospheric pressure outside is 100 kPa, and the piston area is 25 cm2. Determine the mass of the pisto...
See AnswerQ: When a man returns to his well-sealed house on a
When a man returns to his well-sealed house on a summer day, he finds that the house is at 35°C. He turns on the air conditioner, which cools the entire house to 20°C in 30 min....
See AnswerQ: Reconsider Prob. 7–48. Using appropriate software, determine
Reconsider Prob. 7–48. Using appropriate software, determine the power input required by the air conditioner to cool the house as a function of air conditioner EER ratings in the ran...
See AnswerQ: An experimentalist claims to have raised the temperature of a small amount
An experimentalist claims to have raised the temperature of a small amount of water to 150°C by transferring heat from high pressure steam at 120°C. Is this a reasonable claim? Why? Assume no refriger...
See AnswerQ: Water enters an ice machine at 55°F and leaves as
Water enters an ice machine at 55°F and leaves as ice at 25°F. If the COP of the ice machine is 2.4 during this operation, determine the required power input for an ice production rate of 28 lbm/h. (1...
See AnswerQ: A refrigerator is used to cool water from 23 to 5°
A refrigerator is used to cool water from 23 to 5°C in a continuous manner. The heat rejected in the condenser is 570 kJ/min and the power is 2.65 kW. Determine the rate at which water is cooled in L/...
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