Fifty (50) kmol hr-1 of liquid toluene al 1.2 bar is cooled from 100 to 2°C. A vapor- compression refrigeration cycle is used for the purpose. Ammonia is the working fluid. Condensation in the cycle is effected by an air-cooled fin/fan heat exchanger for which the air temperature may be assumed essentially constant at 20°C. Determine:
(a) The low and high pressure levels (bar) in the refrigeration cycle.
(b) The circulation rate of ammonia (mol s-1).
Assume 10°C minimum approach ΔTs tor heat exchange. Data for ammonia:

Where Psat is in bars and T is in kelvins.

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AH23.34 kJ mol P sat -一 In Ps: 45.327 -5.146 in T + 615.0