Classification of Comfort Air Conditioning
Posted by Vishnu on April 14th, 2010 04:05 PM | No Comment
2.29 Classification of Comfort Air Conditioning.
The comfort air conditioning system is divided into three major groups.
1. Summer air conditioning
In summer air conditioning, the temperature and water vapour content of air is reduced by cooling and dehumidification.
2. Winter air conditioning
In winter ...
Psychrometry
Posted by Vishnu on April 14th, 2010 04:01 PM | No Comment
2.27 Psychrometry
Psychrometry is that branch of engineering, which deals with the study of atmospheric air (moist air). For all practical purposes, the atmospheric air is considered to be a mixture of dry air and water vapour. A thorough knowledge of ...
Air Conditioning
Posted by Vishnu on April 14th, 2010 04:00 PM | No Comment
2.26 Air Conditioning
As stated previously, one of the major applications of refrigeration today is for comfort air conditioning. The purpose of air conditioning is to provide a thermal environment so that human in that environment feel thermal comfort. Thermal comfort ...
Refrigerants
Posted by Vishnu on April 14th, 2010 03:59 PM | No Comment
2.25 Refrigerants
A refrigerant is the substance used for heat transfer in a refrigeration system. It picks up heat by evaporating at a low temperature and pressure and gives up heat by condensing at high temperature and pressure.
2.25.1 Desirable properties of ...
Types of Refrigerators
Posted by Vishnu on April 14th, 2010 03:57 PM | No Comment
2.22 Types of Refrigerators
The commonly used refrigerators for domestic and industrial applications are, (i) Vapour compression refrigerator and (ii) Vapour absorption refrigerator
2.23 Vapour compression refrigerator
A schematic and block diagram of a vapour compression refrigerator is shown in fig.2.23 (a) ...
Reversed Carnot Cycle
Posted by Vishnu on April 14th, 2010 03:50 PM | No Comment
2.21 Reversed Carnot Cycle
A refrigerator, working on the reversed carnot cycle, will have the maximum possible coefficient of performance. But due to various limitations, it is practically not possible to make a refrigerator working on this cycle. However, the reversed ...
Coefficient of Performance (C.O.P)
Posted by Vishnu on April 14th, 2010 03:46 PM | No Comment
2.20 Coefficient of Performance (C.O.P)
As discussed, the basic function of a refrigerator is to keep a source at a lower temperature than its surroundings by continuously pumping heat from the source to atmosphere (sink). This is schematically represented in fig ...