The following gauge and thermometer readings are recorded on a refrigeration system employing R22 and operating on a simple saturated cycle in Johannesburg (atmospheric pressure of 82.5 kPa): (i) Evaporator pressure: 350 kPa (ii) Condensing pressure: 1550 kPa Superheat: 5 K (!!!) (iv) Sub-cooling: 8K (v) Discharge temperature: 80°C Calculate the following: 3.1 the evaporating temperature; the condensing temperature; 3.2 (2) (2) 1 THT3701 MOCK EXAM 2020 3.3 the refrigerating effect; (3) 3.4 the refrigerant mass flow rate if the capacity of the plant is 196 kW; (2) 3.5 the power input into the compressor in kW; (3) 3.6 the COP of the plant; (2) 3.7 the compressor efficiency; (3) 3.8 the total heat rejection in kW; and 3.9 the amount of condenser water required in litres per second if the LMTD of the water-cooled condenser is to be limited to 8 K and the design ambient wet- bulb temperature is 20°C. (6) [25]