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An adiabatic capillary tube is used in some refrigeration systems to drop the pressure of the refrigerant from the condenser level to the evaporator level. R-134a enters the capillary tube as a saturated liquid at 50ºC, and leaves at -12ºC. Determine the rate of entropy generation in the capillary tube for a mass flow rate of 0.2 kg/s.

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