To maintain a dwelling steadily at 68°F on a day when the outside temperature is 40°F, heating must be provided a 300 Btu/min. Determine the electrical power required, in kW, to deliver the heating using: (a) electrical-resistance heating. (b) a heat pump whose coefficient of performance is 2.5,

To maintain a dwelling steadily at 68°F on a day when the outside temperature is 40°F, heating must be provided a 300 Btu/min. Determine the electrical power required, in kW, to deliver the heating using: (a) electrical-resistance heating. (b) a heat pump whose coefficient of performance is 2.5,

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Mechanisms of heat transfer

Heat transfer is an essential discipline in thermal engineering that deals with the transfer, conversion, usability, and creation of heat or thermal energy. Transfer of heat occurs through various mechanisms like conduction, convection, radiation, and change of phases. All these mechanisms have distinct characteristics, but these mechanisms can simultaneously occur in an identical system.

Question

To maintain a dwelling steadily at 68°F on a day when the outside temperature is 40°F, heating must be provided at an average rate of
300 Btu/min.
Determine the electrical power required, in kW, to deliver the heating using:
(a) electrical-resistance heating.
(b) a heat pump whose coefficient of performance is 2.5,
(c) a reversible heat pump operating between hot and cold reservoirs at 68°F and 40°F, respectively.

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