1. Refrigerant 12 expands through a throttle from a pressure of 5.2 bar as a saturated liquid to a wet vapour state at – 25°C. What is the state of the wet vapour after the expansion?
2. Superheated ammonia vapour at 100°C, and having a pressure corresponding to a saturation temperature of 50°C, is cooled and condensed to a saturated liquid state. The mass flow is 0.25 kg/s. What is the heat transfer rate?
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