Data for steady-state operation of a
Chapter 10, Problem 17P(choose chapter or problem)
Data for steady-state operation of a vapor-compression refrigeration cycle with Refrigerant 134a as the working fluid are given in the table below. The states are numbered as in Fig. 10.3. The refrigeration capacity is 4.6 tons. Ignoring heat transfer between the compressor and its surroundings, sketch the T–s diagram of the cycle and determine
(a) the mass flow rate of the refrigerant, in kg/min.
(b) the isentropic compressor efficiency.
(c) the coefficient of performance.
(d) the rates of exergy destruction in the compressor and expansion valve, each in kW.
(e) the net changes in flow exergy rate of the refrigerant passing through the evaporator and condenser, respectively, each in kW.
Let \(T_{0}=21^{\circ} \mathrm{C}, \ p_{0}=1 \mathrm{\ bar}\).
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