Assume a combination of superheated cycle and subcooling cycle. A meat container requires a refrigerating system of 15 TR capacity at an evaporator temperature of -10°C and condenser temperature of 40°C. The refrigerant R-134s is subcooled by 8°C hefore entering the expansion valve and the vapor is superheated to 10°C before leaving the evaporator space. A three-cylinder compressor having stroke equal to 12 times the bore operates at 1200 rpm. Assume isentropic compression in the compressor and isenthalpic expansion in the expansion valve. Determine the following:
1. Refrigerating effect per kilogram
2 Mass flow rate of the refrigerant in kg/min 3. Volume of the vapor handled by the compressor per min.
4. Theoretical power 5. COP
6. Bore and stroke of the compressor
Answers
Answer:
Assume a combination of superheated cycle and subcooling cycle. A meat container requires a refrigerating system of 15 TR capacity at an evaporator temperature of -10°C and condenser temperature of 40°C. The refrigerant R-134s is subcooled by 8°C before entering the expansion valve and the vapor is superheated to 10°C before leaving the evaporator space. A three-cylinder compressor having stroke equal to 12 times the bore operates at 1200 rpm. Assume isentropic compression in the compressor and isenthalpic expansion in the expansion valve. Determine the following: 1. Refrigerating effect per kilogram 2 Mass flow rate of the refrigerant in kg/min 3. Volume of the vapor handled by the compressor per min. 4. Theoretical power 5. COP 6. Bore and stroke of the compress.