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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
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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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). Indoor return air T5 = 20°C P₁ = 1 bar (AV)s = 0.42 m³/s 3 T3 = 28°C P3= 14 bar Expansion 4 Valve P₁ = 3.2 bar Condenser www wwwwwww Evaporator Supply air To = 50°C P6 = 1 bar T₂ = 75°C P₂ = 14 bar -2 Outdoor air 1 T₁ = 6°C P₁ = 3.2 bar T 14 bar *28°C 4 3.2 bar 75°C 6 °C
Transcribed Image Text: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). Indoor return air T5 = 20°C P₁ = 1 bar (AV)s = 0.42 m³/s 3 T3 = 28°C P3= 14 bar Expansion 4 Valve P₁ = 3.2 bar Condenser www wwwwwww Evaporator Supply air To = 50°C P6 = 1 bar T₂ = 75°C P₂ = 14 bar -2 Outdoor air 1 T₁ = 6°C P₁ = 3.2 bar T 14 bar *28°C 4 3.2 bar 75°C 6 °C
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