Answer: An ideal vapor-compression refrigeration cycle is

Chapter 10, Problem 33P

(choose chapter or problem)

An ideal vapor-compression refrigeration cycle is modified to include a counterflow heat exchanger, as shown in Fig. P10.33. Ammonia leaves the evaporator as saturated vapor at 1.0 bar and is heated at constant pressure to \(5^{\circ} \mathrm{C}\) before entering the compressor. Following isentropic compression to 18 bar, the refrigerant passes through the condenser, exiting at \(40^{\circ} \mathrm{C}\), 18 bar. The liquid then passes through the heat exchanger, entering the expansion valve at 18 bar. If the mass flow rate of refrigerant is 12 kg/min, determine

(a) the refrigeration capacity, in tons of refrigeration.

(b) the compressor power input, in kW.

(c) the coefficient of performance.

Discuss possible advantages and disadvantages of this arrangement.

                                 

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