The Question: A refrigeration unit utilises ammonia as the refrigerant. The diagram for the circuit is provided, with the following conditions: point (1) is a saturated liquid at –30 oC, points (3), (4) and (7) is a saturated liquid at 10 oC and point (5) is a saturated vapour at –30 oC. The isentropic efficiency of the compressor and pump is 80% and it is assumed there are negligible heat losses to the surroundings. The liquid ammonia has a specific volume of 0.0015 m3 kg-1. I need help on solving the following: 1. You need to discuss which factors must be considered when selecting an appropriate refrigerant 2. You need to calculate the coefficient of performance of the cycle 3. You need to determine the required mass flow rate, if the effect of the refrigeration is 10kW

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