(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;

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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What is the power requirement in kW to 3 decimal places?

(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)
Transcribed Image Text:(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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