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In an ice-making plant, water at 0°C is frozen at atmosphere pressure (333.7 kJ/kg of heat is removed from water per unit mass in order to froze it into ice) by evaporating R-134a saturated liquid at -16°C. The refrigerant leaves this evaporator as a saturated vapor, and the plant is sized to produce ice at 0°C at a rate of 2500 kg/h. Determine the rate of entropy generation in this plant.
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Using the ideal gas model with specific heat ratio, k = 1.4, and ignoring potential energy effects, determine (a) the exit velocity, in m/s, and (b) the rate of heat transfer, in kJ per kg of gas flowing through the nozzle.
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