Liquid of high specific latent heat of vaporisation and low boiling point is used., When the liquid reaches the expansion valve the pressure drops., Liquid evaporates taking in latent heat from inside the fridge, cooling the fridge., When the vapour reaches the compressor the pressure increases., Vapour condenses giving out latent heat. This heat is given off to the surroundings at the back of the fridge., Heat pump transfers energy from a cooler region to a warmer one..

Heat Pump

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