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Avapor-compression refrigeration system with a capacity of in = 10 tons has Refrigerant 134a as the working fluid. Informat and data for the cycle are provided in figure and in the table below. The compression process is internally reversible and can be modeled by pu¹1 = constant. The condenser is water-cooled, with water entering and leaving with a negligible change in pressure transfer from the outside of the condenser can be neglected. Determine: State 1 T (°C) 15 79.95 3 11.6 44 2 st 4 5 6 T₁=44°C Ps-11.6 bar m T₁=20°C T₂=30°C P (bar) 3 12 3 Expansion valve Condenser 0.6709 20 30 6 Evaporator U (m³/kg) 0.07232 0.02051 0.0008847 0.02151 2 P₂= 12 bar Compressor 7=15°C 1 h 5 (kJ/kg) (kJ/kg.K) 0.9656 260.8 310.2 112.2 82.88 (a) the mass flow rate of refrigerant, in kg/s. (b) the power input and the heat transfer rate for the compressor, each in kW. (c) the coefficient of performance. 1.019 112.2 0.4241 0.4054 0.2928 125 0.4341

Avapor-compression refrigeration system with a capacity of in = 10 tons has Refrigerant 134a as the working fluid. Informat and data for the cycle are provided in figure and in the table below. The compression process is internally reversible and can be modeled by pu¹1 = constant. The condenser is water-cooled, with water entering and leaving with a negligible change in pressure transfer from the outside of the condenser can be neglected. Determine: State 1 T (°C) 15 79.95 3 11.6 44 2 st 4 5 6 T₁=44°C Ps-11.6 bar m T₁=20°C T₂=30°C P (bar) 3 12 3 Expansion valve Condenser 0.6709 20 30 6 Evaporator U (m³/kg) 0.07232 0.02051 0.0008847 0.02151 2 P₂= 12 bar Compressor 7=15°C 1 h 5 (kJ/kg) (kJ/kg.K) 0.9656 260.8 310.2 112.2 82.88 (a) the mass flow rate of refrigerant, in kg/s. (b) the power input and the heat transfer rate for the compressor, each in kW. (c) the coefficient of performance. 1.019 112.2 0.4241 0.4054 0.2928 125 0.4341

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Avapor-compression refrigeration system with a capacity of in = 10 tons has Refrigerant 134a as the working fluid. Information and data for the cycle are provided in figure and in the table below. The compression process is internally reversible and can be modeled by pu¹1 = constant. The condenser is water-cooled, with water entering and leaving with a negligible change in pressure. Heat transfer from the outside of the condenser can be neglected. State 1 2 3 4 5 6 T₁=44°C P3-11.,6 bar 4 12 T₁=20°C 7₁=30°C T P (bar) (°C) 3 15 11.6 3 Expansion valve 79.95 44 Condenser 20 30 6 Evaporator 0.6709 0.02151 P₂ = 12 bar Compressor U h S (m²/kg) (kJ/kg) (kJ/kg-K) 0.07232 260.8 0.9656 |T₁= 15°C 0.02051 310.2 0.0008847 112.2 82.88 Determine: (a) the mass flow rate of refrigerant, in kg/s. (b) the power input and the heat transfer rate for the compressor, each in kW. 1.019 112.2 0.4241 0.4054 0.2928 125 0.4341 (c) the coefficient of performance. (d) the mass flow rate of the cooling water, in kg/s. (e) the rates of entropy production in the condenser and expansion valve, in kW/K. (f) the rates of exergy destruction in the condenser and expansion valve, each expressed as a percentage of the compressor power input. Let To = 20°C.
Transcribed Image Text:Avapor-compression refrigeration system with a capacity of in = 10 tons has Refrigerant 134a as the working fluid. Information and data for the cycle are provided in figure and in the table below. The compression process is internally reversible and can be modeled by pu¹1 = constant. The condenser is water-cooled, with water entering and leaving with a negligible change in pressure. Heat transfer from the outside of the condenser can be neglected. State 1 2 3 4 5 6 T₁=44°C P3-11.,6 bar 4 12 T₁=20°C 7₁=30°C T P (bar) (°C) 3 15 11.6 3 Expansion valve 79.95 44 Condenser 20 30 6 Evaporator 0.6709 0.02151 P₂ = 12 bar Compressor U h S (m²/kg) (kJ/kg) (kJ/kg-K) 0.07232 260.8 0.9656 |T₁= 15°C 0.02051 310.2 0.0008847 112.2 82.88 Determine: (a) the mass flow rate of refrigerant, in kg/s. (b) the power input and the heat transfer rate for the compressor, each in kW. 1.019 112.2 0.4241 0.4054 0.2928 125 0.4341 (c) the coefficient of performance. (d) the mass flow rate of the cooling water, in kg/s. (e) the rates of entropy production in the condenser and expansion valve, in kW/K. (f) the rates of exergy destruction in the condenser and expansion valve, each expressed as a percentage of the compressor power input. Let To = 20°C.
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