Why compressors are used in refrigerating systems?
To remove the vapour from the evaporator and to raise the temperature and pressure of the vapour to a point such that the vapour can be condensed wiyh normally available condensing media.
In short, to increase the pressure(above atmospheric pressure) and temperature compressors are used. This refrigerant(which comes out of compressor) which has high pressure,temperature and is in vapour form when enters the condensor changes to liquid form.
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