AC/Refrigerator Paper 2 WASSCE (SC), 2023

Question 3

 

  1. Define each of the following psychrometric properties:
    1. humidity;
    2. dry bulb temperature;
    3. wet bulb temperature.
     
    1. State two functions of a compressor in vapour compression system.
    2. List two components of an absorption refrigeration system.

 

Observation

           

The expected responses are:

(b) (i) Functions of a compressor in vapour compression system

  • It sucks in vapor refrigerant from the evaporator.
  • It compresses the vapour refrigerant thereby increasing both the temperature and pressure.
  • It discharges the refrigerant into the condenser.

                                                                       
(ii) Components of an absorption refrigeration system

  • Generator
  • Condenser
  • Evaporator
  • Absorber
  • Percolator tube
  • Valve
  • Separator