Air conditioning is the process whereby the condition of air, as defined by its temperature and moisture content, is changed as per requirement. In practice other factors should also be taken into account especially cleanliness, odour, velocity, and distribution pattern. Comfort is a very subjective matter. The engineer aims to ensure comfort for most people found from statistical surveys. Most people (90%) are comfortable when the air temperature is between 18 and 22°C and the % saturation is between 40 and 65%.
The following are the general conditions required for human comfort:
- Supply of oxygen per person should always be more than 0.65 m3 per person per hour.
- The amount of carbon dioxide should not be more than 2% in the air.
- The temperature range may vary from 22 to 26°C.
- Humidity range may vary from 60% to 70%.
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