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

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By EE IIT, Kharagpur, India

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Later they also developed large centrifugal compressors working with Freons. Till 1950, the centrifugal compressors were used mainly in USA for air conditioning applications. However, subsequently centrifugal compressors have become industry standard for large refrigeration and air conditioning applications all over the world. Centrifugal compressors developed before 1940, had 5 to 6 stages, while they had 2 to 3 stages between 1940 to 1960. After 1960, centrifugal compressors with a single stage were also developed.

The room where film is developed requires 100% replacement by fresh air of the air polluted by chemicals. Farm Animals: The yield of Jersey cows decreases drastically during summer months. Low temperature results in more efficient digestion of food and increase in weight of cow and the milk yield. Animal barns have to be ventilated in any case since their number density is usually very large. In many countries evaporative cooling is used for creating comfort conditions in animal houses. Computer Rooms: These require control of temperature, humidity and cleanliness.

5 % of the swept volume. Due to generous valve areas and low speed the early compressors were able to compress mixture of vapour as well as liquid. Slowly, the speed of compressors have been increased, for example for a 300 kW cooling capacity system, the mean speed was 40 rpm in 1890, 60 in 1900, 80 in 1910, 150 to 160 in 1915, and went upto 220 in 1916. The term “high speed” was introduced in 1915 for compressors with speeds greater than 150 rpm. However, none of the compressors of this period exceeded speeds of 500 rpm.

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