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LIQUEFACTION OF GASES

 An Important application of gas refrigeration processes is in the liquefaction of  gases. A gas may be cooled either by making it expand isentropically in an expander, thus performing work (sometimes known as external work method) , or making the gas undergo Joule-Kelvin expansion through a throttle valve (sometimes called the internal work method). While the former method always brings about a temperature decrease only when the temperature before throttling is below the maximum inversion temperature.




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