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P TH Tc 2 p-v diagram for a Carnot gas heat pump cycle. refrigeration or

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter45: Domestic Refrigerators And Freezers

Section: Chapter Questions

Problem 9RQ: The defrost cycle in a domestic refrigerator may be terminated by two methods: ___and___.

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Concept explainers

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.

Question

Air within a piston-cylinder assembly executes a Carnot heat pump cycle, as shown in the figure below. For the cycle, T_H = 600 K and T_C = 300 K. The energy rejected by heat transfer at 600 K has a magnitude of 1000 kJ per kg of air. The pressure at the start of the isothermal expansion is 325 kPa.

Assuming the ideal gas model for the air, determine:

(a) the magnitude of the net work input, in kJ per kg of air, and

(b) the pressure at the end of the isothermal expansion, in kPa.

P
TH
Tc
2
p-v diagram for a Carnot gas
heat pump cycle.
refrigeration or

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