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Q18. A vapour compression cooling cycle using CO₂ operates between pressures of 20.9384 bar and 72.1369 bar. The refrigerant enters the compressor at a temperature of -13°C and leaves the condenser as a saturated liquid. The isentropic efficiency of the compressor is 85%.

(a) Sketch the cycle on p-h and T-s diagrams.

(b) Using Barasheet Q6, determine the coefficient of performance of the cycle.

(c) State TWO disadvantages and TWO advantages of CO₂ compared with other refrigerants.