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Ammonia enters a counterflow heat exchanger at -20^∘ C, with a quality of 35 %, and leaves as saturated vapor at -20^∘ C. Air at 300 K, 1 atm enters the heat exchanger in a separate stream with a flow rate of 4 kg / s and exits at 285 K, 0.98 atm. The heat exchanger is at steady state, and there is no appreciable heat transfer from its outer surface. Neglecting kinetic and potential energy effects, determine the mass flow rate of the ammonia, in kg / s, and the rate of entropy production with
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A stream of ammonia enters a steady flow device at 100 kPa and 50^∘ C, at the rate of 1 kg / s. Two streams exit the device at equal mass flow rates; one is at 200 kPa and 50^∘ C, and the other is a saturated liquid at 10^∘ C. It is claimed that the device operates in a room at 25^∘ C on an electrical power input of 250 kW. Is this possible? | Numerade
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