To maintain a dwelling steadily at 68 °F on a day when the outside temperature is 32 °F, heating must be provided at an average rate of 700 Btu/min. Compare the electrical power required, in kW, to deliver the heating using (a) electrical-resistance heating, (b) a heat pump whose coefficient of performance is 3.5, (c) a reversible heat pump operating between hot and cold reservoirs at 68 °F and 32 °F, respectively.
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c) a reversible heat pump operating between hot and cold reservoirs at 68 °F and 32 °F, respectively
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