Q4. In a vapour compression plant 0.452 tonne/hour of refrigerant R134a, leaves the evaporator at a pressure of 2.006 bar and temperature of 0℃. It is then compressed with an isentropic efficiency of 0.825 to a pressure of 8.8672 bar.
The refrigerant leaves the condenser with 5 K of sub-cooling.
(a) Sketch the cycle on EACH of the following:
(i) a Pressure-specific enthalpy diagram indicating the refrigeration effect, compressor work and condenser heat rejection; (2)
(ii) a Temperature-specific entropy diagram, indicating superheat and subcooling. (2)
(b) Determine EACH of the following:
(i) the cooling load; (5)
(ii) the compressor power required; (3)
(iii) the heat rejection in the condenser; (2)
(iv) the coefficient of performance when operating as a heat pump. (2)
Please buy a membership plan and login via our app to view answers.
Download our App
