Definitions
Relative humidity
Direct expansion
Dampers
Vapour compression system
- With reference to air conditioning systems, state the meaning of EACH of the following terms:
(a) heating load;(1)
(b) cooling load;(1)
(c) sensible heat;(2)
(d) latent heat;(2)
(e) absolute humidity;(2)
(f) specific humidity.(2)
5.(a) State THREE types of damper that may be used to control the airflow in an air conditioning system.(3)
(b) Describe, with the aid of a sketch, an automatic fire damper installed in a vertical air duct or in those that pass through bulkheads designated as fire boundaries.(7)
- Describe, with the aid of a sketch, how the relative humidity may be controlled in an Air Conditioning System.(10)
- Describe, with the aid of a sketch, a vapour-compression refrigeration cycle, showing clearly the physical state and condition of the refrigerant in the system.(10)
- Describe, with the aid of a sketch, a Direct Expansion Regrigeration System for an air cooler in an air conditioning installation.(10)
- Sketch an indirect expansion, chilled water air conditioning plant, labelling the MAIN components.(10)