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Tuesday, August 30, 2011

Air conditioning fundamentals

Air conditioning is a process of producing air controlling simultaneously its temperature, humidity, cleanliness and distribution for the fulfillment of required condition of the confined space. An absorbent is a material which removes one or more substances from vapour or liquid due to difference in pressure. Calcium chloride is a solid absorbent and ethylene glycol is a liquid absorbent. The part of air which is not processed through the air conditioning system is called recirculated air. Circulation of chilled air with high velocity is called air blast. To remove impurities from air, air cleaners are used. Commonly used air cleaners are mechanical cleaners and electrostatic cleaners. Air diffuser is a device which converts a fraction of kinetic energy into pressure energy by circulating air against flow resistances. For measuring the velocity of air, anemometers are used. Antifreeze is a chemical which can cross freezing point of water. Typical examples are alcohol, glycol, ethylene glycol and ethyl ether. Antifreeze materials are generally less corrosive and have superlative thermal properties.

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