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1) (60 points) Forty-five kilograms of refrigerant 134a is held in a closed, rigid container at P = 320 kPa and u = 303.99

1) (60 points) Forty-five kilograms of refrigerant 134a is held in a closed, rigid container at P = 320 kPa and u = 303.99 kJ/kg. a) How much heat must be removed to cool the refrigerant to -10 C? b) If the cooling rate is 500 W, how many minutes will it take to reach -10 C? c) At -10 C, what fraction of the total refrigerant volume is liquid?

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