Air conditioning systems
Air conditioning systems
• often referred to as aircon, AC or A/C
• process of altering the properties of air
(primarily temperature and humidity) to more
favourable conditions, typically with the aim of
distributing the conditioned air to an occupied
space to improve comfort.
• refer to any form of technology, heating,
cooling, de-humidification, humidification,
cleaning, ventilation, or air movement, that
modifies the condition of air.
38.2 Comfort AC System
• Temperature of air
 Comfort Condition – 21C & 56% Relative Humidity
• Humidity of air
 for Summer AC - Relative Humidity>60%
 for Winter AC - Relative Humidity< 40%
• Purity of air
• Motion of air
38.4 Equipment used in AC
• Circulation Fan
• AC Units
• Supply Ducts
• Supply Outlets
• Return Outlets
• Filters
38.4 Equipment used in AC
Comfort Condition – 21C & 50% Relative
Humidity
Sensible Heat Factor
For residence or private office - 0.9
For restaurants or busy office – 0.8
For auditorium or cinema hall– 0.7
Ball room dance Hall – 0.6
Winter AC
summer AC