MECHANICAL ENGINEERING

Working fluid of refrigrator is refrigrant.Refrigerant is a compound typically found in either a fluid or gaseous state. It readily absorbs heat from the environment and can provide refrigeration or air conditioning when combined with other components such as compressors and evaporators.                        Refrigration process consists of four process as follows: 1)Compression:process 1-2 is compression.It is adiabatic process.compression is either dry compression or wet cimpression depending on wether saturated vapour or wet vapour being compressed.Dry compression is preferred. 2)Cooling:2-3 is cooling process.After compression temperature increases.So cooloing is needed.It is isobaric process. 3)Expansion:3-4 is expansion process.It is isentropic process.It is irreversible.Throttling cause sudden pressur drop.Due to pressure drop boiling point of refrigrant decreases and it starts evaporating,heat required comes from refrigrant.So its temperature drops.