Problem
1. A refrigerator in a meat warehouse must maintain a low temperature of -15oC, and the outside temperature is 20oC. It uses ammonia as the refrigerant, which must remove 5 kW from the cold space. Find the flow rate of the ammonia needed, assuming a standard vapor compression refrigeration cycle with a condenser at 20oC.
2. A refrigerator has a steady flow of R-410a as saturated vapor at -20oC into the adiabatic compressor that brings it to 1400 kPa. After the compressor, the temperature is measured to be 60oC. Find the actual compressor work and the actual cycle COP.
The response should include a reference list. Double-space, using Times New Roman 12 pnt font, one-inch margins, and APA style of writing and citations.