(a) In a refrigerating plant using R12 the vapour leaves the evaporator dry saturated at 1.826 bar and is compressed to 7.449 bar. The temperature of the vapour leaving the compressor is 45°C. The liquid leaves the condenser at 25°C and is throttled to the evaporator pressure. Calculate: (i) the refrigeratig effect; (ii) the specific work input; (iii) the COPref (b) Compare the results found in (a) with a plant using R134a between the same saturation temperatures, with the same maximum cycle temperature and the same degree of undercooling of the condensate. (121.27 kJ/kg; 29.66 kJ/kg; 4.09; 152.05 kJ/kg; 43.65 kJ/kg; 3.48)
(a) In a refrigerating plant using R12 the vapour leaves the evaporator dry saturated at 1.826 bar and is compressed to 7.449 bar. The temperature of the vapour leaving the compressor is 45°C. The liquid leaves the condenser at 25°C and is throttled to the evaporator pressure. Calculate: (i) the refrigeratig effect; (ii) the specific work input; (iii) the COPref (b) Compare the results found in (a) with a plant using R134a between the same saturation temperatures, with the same maximum cycle temperature and the same degree of undercooling of the condensate. (121.27 kJ/kg; 29.66 kJ/kg; 4.09; 152.05 kJ/kg; 43.65 kJ/kg; 3.48)
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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