Hotel Service Unit 11 Refrigeration Q6 – Answer

  1. (a) Sketch a vapour compression refrigeration system, labelling the main components.(5)
    (b) Indicate the refrigerant conditions at the salient points on the sketch in part(a).(5)

(a) Vapour Compression Refrigeration System (5 marks)

Sketch to include (labelled):

  1. Compressor
  2. Condenser
  3. Receiver (liquid storage)
  4. Expansion valve (TXV/capillary tube)
  5. Evaporator

➡ Arrows showing direction of refrigerant flow:
Compressor → Condenser → Receiver → Expansion Valve → Evaporator → back to Compressor

(b) Refrigerant conditions at salient points (5 marks)

  1. Compressor suction (from evaporator):
    • Low pressure, low temperature vapour
  2. Compressor discharge (to condenser):
    • High pressure, high temperature vapour
  3. Condenser outlet (to receiver):
    • High pressure, medium temperature liquid
  4. Expansion valve outlet (to evaporator):
    • Low pressure, low temperature liquid-vapour mixture
  5. Evaporator outlet (back to compressor):
    • Low pressure, low temperature vapour