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

By EE IIT, Kharagpur, India

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

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The French company Crespin & Marteau started manufacturing methyl chloride compressors from 1884. This continued upto the first world war. Escher Wyss of USA started making these compressors from 1913 onwards, right upto the Second World War. At the beginning of 20th century, practically all the compressors in USA, Great Britain and Germany used either ammonia or carbon dioxide. In France, in addition to these two, sulphur dioxide and methyl chloride were also used. Compressor capacity comparison tests have been conducted on different types of compressors as early as 1887 in Munich, Germany.

5 Version 1 ME, IIT Kharagpur Due to the emergence of a large number of refrigerants in addition to the existence of the older refrigerants, it has become essential to work out a numbering system for refrigerants. Thus all refrigerants were indicated with ‘R’ followed by a unique number (thus Freon-12 is changed to R12 etc). The numbering of refrigerants was done based on certain guidelines. g. 11, 12, 22) denotes the chemical composition. The number of all inorganic refrigerants begins with ‘7’ followed by their molecular weight.

The other rotor is the female rotor and this has valleys machined into it that match the curvature of the male lobes. Typically the female rotor will have six valleys. This means that for one revolution of the male rotor, the female rotor will only turn through 240 deg. For the female rotor to complete one cycle, the male rotor will have to rotate 11/2 times. The single screw type compressor was first made for air in 1967. Grasso, Netherlands introduced single screw refrigerant compressors in 1974.

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