A Cascade refrigeration system using R-410A and a heat exchanger is operating an evaporator with a capacity of 8 tons and temperature of -30°C. If the heat exchanger produces 1.0 Mpa and the condensing temperature is 50°C, determine the COP and the refrigerating efficiency of the system. Draw the schematic diagram of the system and assume ideal conditions.

The food storage room requires a cooling system with a capacity of 10 tons of refrigeration which operates at an evaporator temperature of -17.8 degrees Celsius and a condenser temperature of 30.1 degrees Celsius. The activities used are R-717 and the operating system is in saturated conditions. Determine a. Flow rate b. refrigerant flow rate c. rate of heat loss in the condenser.

An ammonia system with a 158-kW evaporator operating at -1°C and a 35-kW evaporator operatingat -40°C uses flash gas removal and intercooling. The condensing temperature is 32°C. Thearrangement is as shown. How many kilograms per minute of ammonia are compressed by the high-pressure compressor?