A617 Air Conditioning Basics 2: The Air Conditioning Process - London

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Trainer - Steve Nicholson

If a room is to be kept at a comfortable state, the air supplied to it must be cooler than the room temperature and drier than the room moisture content, by amounts related to the respective sensible and latent heat gains. It follows that knowledge of the way in which the air must be processed to achieve such values of temperature and moisture content is necessary.

The air handled by an air conditioning system is a mixture of dry air (nitrogen and oxygen) and water vapour (steam at a low pressure). A study of the physical behaviour of this mixture is termed psychrometry and a proper understanding of the subject is essential to an appreciation of air conditioning.

This second part of the course gives a simplified introduction to psychrometry, using diagrams, illustrates the way in which the processes of cooling, dehumidification, humidification etc occur, in relation to the items of plant that effect them.

Air distribution in rooms is discussed and two useful, simple equations are derived. These enable the supply air quantity necessary to deal with the sensible and latent heat gains to be calculated. In turn this leads to a practical choice of the supply air state (temperature and moisture content) and to a calculation of the cooling load on the refrigeration plant that forms a necessary part of the air conditioning system.

Session 1

Psychrometric fundamentals, the psychrometric chart and psychrometric processes.

Session 2

Air distribution in rooms. Derivation of two simple equations relating volumetric supply airflow rates to sensible and latent heat gains.

Session 3

The choice of the supply air state.

Session 4

Model calculation of a cooling load.

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