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

By EE IIT, Kharagpur, India

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The large diameter, 3600 rpm machines were replaced by compact 10000 to 12000 rpm compressors. Large centrifugal compressors of cooling capacities in the range of 200000 kcal/h to 2500000 kcal/h were used in places such as World Trade Centre, New York. 7 shows cut-view of a two-stage, semi-hermetic centrifugal compressor. Fig. 7 Cut-view of a two-stage, semi-hermetic centrifugal compressor. 16 Version 1 ME, IIT Kharagpur Q. The early refrigerant compressor design resembled: a) Automobile engines b) Steam engines c) Water pumps d) None of the above Ans.

They started manufacturing two-stage carbon dioxide compressors since 1889. Soon the carbon dioxide systems replaced air cycle refrigeration systems in ships. Several firms started manufacturing these compressors on a large scale. This trend continued upto the Second World War. A significant development took place in 1876 by the introduction of a twin cylinder vertical compressor working with ammonia by Carl von Linde. Similar to his earlier methyl ether compressor (1875) a bath of liquid mercury was used to make the compressor gas-tight.

7. Cooling for preservation: Many compounds decompose at room temperature or these evaporate at a very fast rate. Certain drugs, explosives and natural rubber can be stored for long periods at lower temperatures. 8. Recovery of Solvents: In many chemical processes solvents are used, which usually evaporate after reaction. These can be recovered by condensation at low temperature by refrigeration system. Some of the examples are acetone in film manufacture and carbon tetrachloride in textile production.

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