In an ammonia refrigeration system for the low- temperature application, a two-stage operation is desirable which employs an ammonia system that serves a 30-ton evaporator at -26 C. The system uses a direct contact cascade condenser and the condenser temperature is 35 C.
Determine; (a) the mass flow rate of the low-pressure loop in kg/min.
(b) the mass flow rate of the high-pressure loop in kg/min. (c) the total power in kW