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3. A vapour compression plant uses R717 and has a suction saturation temperature of -28°C and a condenser saturation temperature of 2°C. The vapour is dry saturated on entering the

first stage compressor and there is no under-cooling of the condensate. The compression is carried out isentropic ally in two stages and a flash chamber is employed at an inter-stage saturation temperature of -8°C. a. Draw T-S diagram b. Calculate COP

Fig: 1

Fig: 2

Fig: 3