An ammonia refrigeration cycle works between a condenser saturation temperature of 50oC and an evaporator temperature of -50oC. The liquid entering the throttle valve is saturated. The vapor entering the compressor has an entropy of 5.365 kJ/kgK, i.e. it will reach saturation at -2 oC, (a) Calculate the refrigeration effect and the coefficient of performance. (b) The cycle is modified as shown in Fig. Q4. The temperature in the flash chamber is -2
An ammonia refrigeration cycle works between a condenser saturation
temperature of 50oC and an evaporator temperature of -50oC. The liquid entering the throttle
valve is saturated. The vapor entering the compressor has an entropy of 5.365 kJ/kgK, i.e. it
will reach saturation at -2
oC,
(a) Calculate the refrigeration effect and the coefficient of performance.
(b) The cycle is modified as shown in Fig. Q4. The temperature in the flash chamber is
-2
oC, and the saturated vapor bled off is mixed with the saturated vapor leaving the
first-stage compressor. Calculate the correct amount to be bled, the refrigeration
effect, and the coefficient of performance, all quantities to be based on 1 kg passing
through the condenser.
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