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

By EE IIT, Kharagpur, India

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A) Q. : e) Q. : a) Q. : d) Q. 5 Application of air conditioning: Air-conditioning is required for improving processes and materials apart from comfort air-conditioning required for comfort of persons. The life and efficiency of electronic devices increases at lower temperatures. Computer and microprocessor-based equipment also require air-conditioning for their efficient operation. Modern electronic equipment with Very Large Scale Integrated (VLSI) chips dissipates relatively large quantities of energy in a small volume.

In view of the seriousness of the problem on global scale, several countries have agreed to ban the harmful Ozone Depleting Substances, ODS (CFCs and others) in a phase-wise manner under Montreal Protocol. Subsequently almost all countries of the world have agreed to the plan of CFC phase-out. In addition to the ozone layer depletion, the CFCs and related substances were also found to contribute significantly to the problem of “global warming”. This once again brought the scientists back to the search for “safe” refrigerants.

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. This ammonia compressor was installed in a brewery in 1877 and worked there till 1908. In 1877, Linde improved the compressor design by introducing a horizontal, double acting cylinder with a stuffing box made from two packings separated by glycerine (glycerine was later replaced by mineral oil).

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