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The figure shows a two-stage vapor-compression refrigeration system with ammonia as the working fluid. The system uses a direct contact heat exchanger to achieve intercooling. The evaporator has a refrigerating capacity of 30 tons and produces -20 °F saturated vapor at its exit. In the first compressor stage, the refrigerant is compressed adiabatically to 80 lbf/in², which is the pressure in the direct contact heat exchanger. Saturated vapor at 80 lbf/in² enters the second compressor stage an
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