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 70°C, and leaves at -20°C. Determine the rate of entropy generation in the capillary tube for a mass flow rate of 0.2 kg/s.

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R-134a 70°CCapillary tube sat. liq. 20°C