A food storage locker requires a refrigeration system of 2,400 kJ/min capacity at an evaporator temperature of -10OC and a condenser temperature of 30OC. The refrigerant used is freon-12 and sub-cooled by 6OC before entering the expansion valve and vapor is superheated by 7OC before leaving the evaporator coil. The compression of refrigerant is isentropic. The refrigeration compressor is two-cylinder, single-acting with stroke equal to 1.25 times the bore diameter and operates at 1000 rpm. Determine: (a) refrigerating effect, (b) mass of refrigerant to be circulated, (c) theoretical piston displacement per minute
A food storage locker requires a refrigeration system of 2,400 kJ/min capacity at an evaporator
temperature of -10OC and a condenser temperature of 30OC. The refrigerant used is freon-12 and
sub-cooled by 6OC before entering the expansion valve and vapor is superheated by 7OC before
leaving the evaporator coil. The compression of refrigerant is isentropic. The refrigeration
compressor is two-cylinder, single-acting with stroke equal to 1.25 times the bore diameter and
operates at 1000 rpm. Determine: (a) refrigerating effect, (b) mass of refrigerant to be circulated,
(c) theoretical piston displacement per minute, (d) theoretical power to run the compressor in kW,
(e) heat removed from the condenser per min. (f) theoretical bore and stroke of compressor.
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