A vapor-compression refrigerator operates as in the right figure using CO₂ as refrigerant. The evaporation is at -10 °C and the condensation is at 20 °C. The efficiency of the compressor is 0.7, and the refrigeration capacity is 1500 kJ/s. Using the P-H diagram below, (a) Estimate the power requirement, the heat transfer rate in the condenser, and the circulation rate of CO2. (b) Estimate the coefficient of performance. (c) Sketch the cycle in the P-H diagram (as accurate as possible). Pressure Entropy [kJ/kg.K] 1.0 20 MPa 18 MPa 15 MPa 13 MPa 10 MPa 9 MPa 8 MPa 7 MPa 6 MPa 5 MPa 4 MPa 3.5 MPa 3MPa 2.5 MPa 2MPa 150 -10°C 0°C P-h diagram for Carbon Dioxide Refrigerant [R744] 1.2 1.3 1.4 1.5 1.1 1.6 10 °C 200 20 °C 30 °C 40 °C سال اگر 1.7 1.8 100 C 120 C 50 °C 60°C 70°C 80 °C 90 °C 250 volume [m³/kg]. 10% 20% 30% 40% 50% 60% 70% 80% 90% 0.002: 300 0.003 0.004 350 Enthalpy (kJ/kg) 400 0.006 450 Throttle valve 4 -0.008 0.01 Condenser 500 1.9 2.0 140 C 160 C 180 C Evaporator Compressor 550 3 plot by izzi 2 2.1 600
A vapor-compression refrigerator operates as in the right figure using CO₂ as refrigerant. The evaporation is at -10 °C and the condensation is at 20 °C. The efficiency of the compressor is 0.7, and the refrigeration capacity is 1500 kJ/s. Using the P-H diagram below, (a) Estimate the power requirement, the heat transfer rate in the condenser, and the circulation rate of CO2. (b) Estimate the coefficient of performance. (c) Sketch the cycle in the P-H diagram (as accurate as possible). Pressure Entropy [kJ/kg.K] 1.0 20 MPa 18 MPa 15 MPa 13 MPa 10 MPa 9 MPa 8 MPa 7 MPa 6 MPa 5 MPa 4 MPa 3.5 MPa 3MPa 2.5 MPa 2MPa 150 -10°C 0°C P-h diagram for Carbon Dioxide Refrigerant [R744] 1.2 1.3 1.4 1.5 1.1 1.6 10 °C 200 20 °C 30 °C 40 °C سال اگر 1.7 1.8 100 C 120 C 50 °C 60°C 70°C 80 °C 90 °C 250 volume [m³/kg]. 10% 20% 30% 40% 50% 60% 70% 80% 90% 0.002: 300 0.003 0.004 350 Enthalpy (kJ/kg) 400 0.006 450 Throttle valve 4 -0.008 0.01 Condenser 500 1.9 2.0 140 C 160 C 180 C Evaporator Compressor 550 3 plot by izzi 2 2.1 600
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
Chapter47: High-pressure, Low-pressure, And Absorption Chilled-water Systems
Section: Chapter Questions
Problem 13RQ: The subcooling temperature in a condenser can be measured by taking the difference between the A....
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