6-47E A heat pump with a COP of 1.4 is to produce 100,000 Btu/h heating effect. How much power does this device require, in hp?

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Inginning Thermo
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6-47E 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?
6-48 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 transfer to the outside air. Answers:
(0) 2.38, (b) 1065 kJ/min
6-49 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 for the refrigerator to cool them. The
watermelons can be treated as water whose specific heat
is 4.2 kJ/kg-°C. Is your answer realistic or optimistic?
Explain. Answer: 104 min
6-50 When a man returns to his well-sealed house on a sum-
mer day, he finds that the house is at 35°C. He turns on the air
onditioner, which cools the entire house to 20°C in 30 min.
f the MD of the air mattinaina murtom in 20
Transcribed Image Text:Inginning Thermo home in your default browser Set as defaul ok.pdf pressure definition ⒸF|C/Users/erice/Desktop/REY/1s%20TERM20-Teaching/E-boo * *** Mer of Performan Toyda Spor The Impoft ****** tafsson ** SE satel 336 /1009 supplied. 6-47E 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? 6-48 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 transfer to the outside air. Answers: (0) 2.38, (b) 1065 kJ/min 6-49 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 for the refrigerator to cool them. The watermelons can be treated as water whose specific heat is 4.2 kJ/kg-°C. Is your answer realistic or optimistic? Explain. Answer: 104 min 6-50 When a man returns to his well-sealed house on a sum- mer day, he finds that the house is at 35°C. He turns on the air onditioner, which cools the entire house to 20°C in 30 min. f the MD of the air mattinaina murtom in 20
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