Components of a heat pump for supplying heated air to a dwelling are shown in the schematic below. At steady state, Refrigerant 134a enters the compressor at 6 °C, 3.2 bar and is compressed adiabatically to 75 °C, 14 bar. From the compressor, the refrigerant passes through the condenser, where it condenses to liquid at 28 °C, 14 bar. The refrigerant then expands through a throttling valve to 3.2 bar. The states of the refrigerant are shown on the accompanying T-s diagram. Return air from the dwelling enters the condenser at 20 °C, 1 bar with a volumetric flow rate of 0.42 m³/s and exits at 50 °C with a negligible change in pressure. Using the ideal gas model for the air and neglecting kinetic and potential energy effects. (a) determine the rates of entropy production, in kW/K, for control volumes enclosing the condenser, compressor, and expansion valve, respectively. (b) Discuss the sources of irreversibility in the components considered in part (a).

Components of a heat pump for supplying heated air to a dwelling are shown in the schematic below. At steady state, Refrigerant 134a enters the compressor at 6 °C, 3.2 bar and is compressed adiabatically to 75 °C, 14 bar. From the compressor, the refrigerant passes through the condenser, where it condenses to liquid at 28 °C, 14 bar. The refrigerant then expands through a throttling valve to 3.2 bar. The states of the refrigerant are shown on the accompanying T-s diagram. Return air from the dwelling enters the condenser at 20 °C, 1 bar with a volumetric flow rate of 0.42 m³/s and exits at 50 °C with a negligible change in pressure. Using the ideal gas model for the air and neglecting kinetic and potential energy effects. (a) determine the rates of entropy production, in kW/K, for control volumes enclosing the condenser, compressor, and expansion valve, respectively. (b) Discuss the sources of irreversibility in the components considered in part (a).

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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