Air-Conditioning

Air-conditioning is the bringing of air in a building to a desired temperature, purity and humidity throughout the year to maintain healthy and comfortable atmosphere.

Air-conditioning may be divided into two main sections: one for the processing of materials in industry; the other for human comfort. It has been found that there is an optimum condition of temperature and humidity at which the processing of different materials may be carried out with the minimum of wastage and the maximum of goods of specification quality. The system is therefore designed to produce air of predetermined temperature and moisture content and to keep it so despite all external influences. Such air is filtered free of foreign material.

Conditioning air for human comfort mat also be divided into two main sections – winter and summer. Frequently, the systems installed in office buildings provide control during both seasons. Complete air-conditioning provides the following services.

First, filtration of the air both in winter and summer to remove dust.

Second, calculation of the air at low velocity and with proper diffusion to prevent draughts and maintain a uniform temperature and humidity at all parts of the inhabited space.

Third, introduction of enough fresh air from the outside atmosphere.

Fourth, heating of the air in winter.

Fifth, cooling of the air in summer below the outside atmosphere.

Sixth, humidifying the air in winter to a relative humidity of at least 20-25 per cent.

Seventh, dehumidifying the air in summer to a relative humidity not exceeding 55 per cent.