Question: Refrigerant-134a is converted from a saturated liquid to a saturated vapor in a closed system using a reversible constant pressure process by transferring heat from

Refrigerant-134a is converted from a saturated liquid to a saturated vapor in a closed system using a reversible constant pressure process by transferring heat from a heat reservoir at 6°C. From second-law point of view, is it more effective to do this phase change at 100 kPa or 180 kPa? Take T0 = 25°C and P0 = 100 kPa.

R-134a 100 kPa sat liquid FIGURE P8-90

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