A refrigeration system uses HFC-134A as the refrigerant. The evaporator temperature desired is 6C and the condenser temperature is 40C. If the compressor efficiency is =0.78, determine the coefficient of performance and the work required for 600 KW of cooling. How many tons of cooling does that correspond to? If you can substitute ammonia for this system, how would the answers change? Show the thermodynamic pathways on the appropriate diagrams.