It is desired to produce 10 kW of refrigeration from a vapor-compression refrigeration cycle. The working fl uid is refrigerant 134a. The cycle operates between 120 kPa and 900 kPa. Assuming an ideal cycle, determine the COP and the mass fl ow rate of refrigerant needed. Properties of refrigerant 134a can be found at http://webbook.nist.gov/chemistry/fl uid/. Data can be viewed in an HTML table.