226. A two stage cascade vapor compression refrigeration system uses ammonia in the low-

temperature loop and R-12 in the high-temperature loop. The ammonia provides 15 tons of

cooling. If the high-loop temperature requires 10.12 kW compressor power and low loop 15.93

kW, determine the COP of the system.

A. 2.027 TR B. 5.22 TR C. 3.314 TR D. 9.1 TR