What is the coefficient of performance to 1 decimal place? (a) In a refrigerating plant using R12 the vapour leaves the evaporator dry saturatedat 1.826 bar and is compressed to 7.449 bar. The temperature of the vapour leaving thecompressor is 45°C. The liquid leaves the condenser at 25°C and is throttled to theevaporator pressure. Calculate:(i) the refrigerating effect;(ii) the specific work input;(iii) the COPrer.(b) Compare the results found in (a) with a plant using R134a between the samesaturation temperatures, with the same maximum cycle temperature and the same degreeof undercooling of the condensate.(121.27 kJ/kg; 29.66 kJ/kg; 4.09; 152.05 kJ/kg; 43.65 kJ/kg; 3.48)

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What is the coefficient of performance to 1 decimal place?

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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Question

What is the coefficient of performance to 1 decimal place?

(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 refrigerating effect;
(ii) the specific work input;
(iii) the COPrer.
(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)

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