In an ideal ammonia refrigeration cycle, ammonia flows ut of the condenser as a

Question

In an ideal ammonia refrigeration cycle, ammonia flows ut of the condenser as a saturated liquid at 50 degC and passes through a first expansion valve, in which it is throttled to 0 degC. It then flows to a separator in which the vapor is bled off and the liquid throttled to -50 degC, before passing through the evaporator. The entropy of the water vapor entering the compressor is 3.3313 kJ/kg*K (which is equal to sg at 0 degC) and, after its temperature is raised to 0 degC in the low-pressure compressor, it is mixed with the bled off saturated vapor and then compressed to the saturation press at 50 degC. Calculate: a) the fraction of the flow entering the separator that must be bled off b) the refrigeration capacity (assuming a condenser flow rate of 1 kg/sec) c) the coefficient of performance of the cycle.

Explanation / Answer

en.wikipedia.org/wiki/Coefficient_of_performance

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