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4O LESSONS ON REFRIGERATION AND AIR CONDITIONING FROM IIT by EE IIT, Kharagpur, India

By EE IIT, Kharagpur, India

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Extra resources for 4O LESSONS ON REFRIGERATION AND AIR CONDITIONING FROM IIT KHARAGPUR. USEFUL TRAINING MATERIAL FOR MECHANICAL ENGINEERING STUDENTS COLLEGE, OR AS REFERENCE FOR ENGINEER

Example text

1. Relation between refrigeration and air conditioning 2 Version 1 ME, IIT Kharagpur the main purpose of refrigeration was to produce ice, which was used for cooling beverages, food preservation and refrigerated transport etc. Now-a-days refrigeration and air conditioning find so many applications that they have become very essential for mankind, and without refrigeration and air conditioning the basic fabric of the society will be adversely affected. Refrigeration and air conditioning are generally treated in a single subject due to the fact that one of the most important applications of refrigeration is in cooling and dehumidification as required for summer air conditioning.

It was almost 65 years later that the concept was re-invented by a refrigeration industry keen to exploit the potentials 14 Version 1 ME, IIT Kharagpur of scroll technology. Copeland in USA, Hitachi in Japan introduced the scroll type of compressors for refrigerants in 1980s. Scroll compressors have been developed for operating temperatures in the range of 45°C to +5°C suitable for cold storage and air conditioning applications. This scroll has also been successfully applied throughout the world in many freezer applications.

With the open type compressors there is always a possibility of refrigerant leakage from an open type compressor, even though the rotating mechanical seals developed reduced the leakage rate considerably. Since leakage cannot be eliminated completely, systems working with open type compressors require periodic servicing and maintenance. g. domestic refrigerators), serious thought was given to tackle this problem. A hermetic or sealed compressor was the outcome of this. 11 Version 1 ME, IIT Kharagpur An Australian Douglas Henry Stokes made the first sealed or hermetic compressor in 1918.

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