A vapour compression cycle refrigerator is driven by a compressor. The enthalpies of saturated liquid and saturated vapour refrigerant at the operating condensing temperature of 34⁰C are 60.90Kj/Kg and 201.45Kj/Kg respectively. The enthalpy of the refrigerant at the end of compression is 208.90Kj/Kg. The saturated refrigerant vapour leaving the evaporator has an enthalpy of 187.53Kj/Kg. Determine;
1. The thermal energy injected per Kg of refrigerant.
2. The cooling effect per Kg of refrigerant.
3. The work done by the compressor.
4. The COP of the refrigerator.