A Freon 12 vapour compression system operating at a condenser temperature of 40°C and an evaporator temperature of 0°C develops 15 tons of refrigeration. Using the p-h diagram for Freon 12, determine. (a) the discharge temperature and mass flow rate of the refrigerant circulated,

A Freon 12 vapour compression system operating at a condenser temperature of 40°C and an evaporator temperature of 0°C develops 15 tons of refrigeration. Using the p-h diagram for Freon 12, determine. (a) the discharge temperature and mass flow rate of the refrigerant circulated,

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

Chapter28: Special Refrigeration Applications

Section: Chapter Questions

Problem 15RQ: Why is two-stage compression popular for extra-low-temperature refrigeration systems?

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Welded ______sealed compressors are normally used in household refrigerators.
Why is two-stage compression popular for extra-low-temperature refrigeration systems?
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The condensing and evaporating pressures in a 10 TR R-22 refrigeration system are 11.82 bar and 1.64 bar, respectively. The refrigerant enters the compressor at dry and saturated state and leaves the condenser subcooled by 10°C. The actual COP is 70% of its theoretical value. Determine the condenser temperature in °C. Determine the evaporator temperature in °C. Determine the subcooling temperature in °C. Approximating the operating temperatures to the nearest whole number, determine the heat rejected in kJ/kg. Approximating the operating temperatures to the nearest whole number, determine the mass flowrate of the refrigerant in the system. Approximating the operating temperatures to the nearest whole number, determine the power requirement of the system. Approximating the operating temperatures to the nearest whole number, determine the theoretical COP of the system. Approximating the operating temperatures to the nearest whole number, determine the Actual COP of the system.
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Additional Instructions: Define each enthalpy obtained from tables and chart and draw the p-h diagram labeling the respective evaporating and condensing pressures and temperatures in each problem. (2) A standard vapor compression system produces 20 tons of refrigeration using R-12 as a refrigerant while operating between a condenser temperature of 41.6 C and an evaporator temperature of -25°C. Determine (a) the refrigerating effect in kJ/kg, (b) the circulating rate in kg/s, (c) the power supplied, (d) the COP, (e) the heat rejected in kW, and (f the volume flow rate in L/s. Ans. (a) 100.26 kJ/kg, (b) 0.7022 kg/s, (c) 25.69 kW, (d) 2.74, (e) 96.09 kW, (f) 92.18 L/s
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A compressor serves two evaporators, one providing 5 tons of cooling at -20 degree F and the other, 10 tons of cooling at 10F. The system is a vapor-compression refrigeration system using R-12 with the condenser pressure at 200 psia. Assume saturated conditions leaving the condenser and evaporators and isentropic compression. Determine (a) the refrigerant flow through each evaporator, (b) the R-12 state entering the compressor, and (c) the compressor power.
a freon 12 vapour compression system operating at a condenser temperature of 40 degree centigrade and an evaporative temperature of 0 degree centigrade develops 15 tons of refrigeration. using P-H diagram for freon 12, determine, a. the discharge temperature and mass flow rate of the refrigerant circulated, b. the teoretical piston displacement of the condenser and piston displacement per ton of refrigerant c. the theoretical horsepower of the compressor and horsepower per ton of the refrigerant d. the heat rejected in the condenser, and e. the Carnot COP and actual COP of the cycle.
A Freon 12 vapour compression system operating at a condenser temperature of 45Co and an evaporator temperature of 0Co develops 20 tons of refrigeration. Using the p-h diagram for Freon 12, determine; (15) a) The mass flow rate of the refrigerant circulated. b) The heat rejected in the condenser, and c) The Carnot COP and the actual COP of the cycle.
Can you also show the plot on the chart provided? The mass flow rate of the refrigerant in a Single Stage Vapor Compression (SSVC) refrigeration system is 0.015 kg/s and the evaporating and condensing temperatures shall be -20°C and 50°C, respectively. Determine the following: (1) cooling capacity in tons, (2) work of compressor in kW, (3) COP of the system, (4) EER of the system, and (5) refrigerating efficiency. Can you also show the plot on the chart provided?
A vapor compression refrigeration cycle undergoes wet compression and maintains the temperatureof the refrigerated space to -25C. The system uses R-12 refrigerant and undergoes isentropicexpansion to the inlet of the evaporator. The compressor discharges the refrigerant at saturatedvapor state at a condensing pressure of 1367 kPa. Determine:a) Determine the enthalpy of all statesb) Determine the quality of refrigerant entering the evaporatorc) Determine the quality of refrigerant leaving the evaporatord) Refrigerant effecte) Work of compressionf) COP If a liquid to suction heat exchanger was installed to prevent wet compression such that it allows 6Csub cooling of refrigerant and superheating to 8C. The expansion of refrigerant is no moreisentropic but isenthalpic. Therefore, determine:g) Enthalpy at different section of the cycleh) COP of the system compared to COP of standard vapor compression cycle.