Q6. In a vapour compression refrigeration plant, The R134a enters the compressor at a pressure and temperature of 1.0637 bar and -20℃ respectively. At These conditions the specific volume is 0.1859 m3⁄kg.
The refrigerant undergoes isentropic compression to 8.8672 bar and leaves the condenser with 10 K subcooling.
The 6-cylinder single stage compressor runs at a speed of 200 rev/min and has a bore and stroke of 190 mm and 200 mm respectively. The volumetric efficiency at this speed is 86 %.
(a) Sketch The cycle on a pressure-specific enthalpy diagram indicating areas of heat and work transfer. (2)
(b) Sketch The cycle on a Temperature- specific entropy diagram indicating areas of super heat and sub cooling, (2)
(c) Calculate EACH of the following:
(i) The temperature at the end of compression; (5)
(ii) The coefficient of performance; (3)
(iii) The compressor powers. (4)
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