Energy transfers by heat through the exterior walls and roof of a house at a rate of 4.06 x 103 J/s = 4.06 kW when the inter temperature is 22.0°C and the outside temperature is -4.00°C. (a) Calculate the electric power required to maintain the interior temperature at 22.0°C if the power is used in electri resistance heaters that convert all the energy transferred in by electrical transmission into internal energy. kW (b) Calculate the electric power required to maintain the interior temperature at 22.0°C if the power is used to drive electric motor that operates the compressor of a heat pump that has a coefficient of performance equal to 60.0% of Carnot-cycle value.

Energy transfers by heat through the exterior walls and roof of a house at a rate of 4.06 x 103 J/s = 4.06 kW when the inter temperature is 22.0°C and the outside temperature is -4.00°C. (a) Calculate the electric power required to maintain the interior temperature at 22.0°C if the power is used in electri resistance heaters that convert all the energy transferred in by electrical transmission into internal energy. kW (b) Calculate the electric power required to maintain the interior temperature at 22.0°C if the power is used to drive electric motor that operates the compressor of a heat pump that has a coefficient of performance equal to 60.0% of Carnot-cycle value.

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

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

Question

Energy transfers by heat through the exterior walls and roof of a house at a rate of 4.06 x 103 J/s = 4.06 kW when the interior
temperature is 22.0°C and the outside temperature is -4.00°C.
(a) Calculate the electric power required to maintain the interior temperature at 22.0°C if the power is used in electric
resistance heaters that convert all the energy transferred in by electrical transmission into internal energy.
kW
(b) Calculate the electric power required to maintain the interior temperature at 22.0°C if the power is used to drive an
electric motor that operates the compressor of a heat pump that has a coefficient of performance equal to 60.0% of the
Carnot-cycle value.
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