One of the major industry in Indiaisdairy industry. Inthe dairy industry the milk is cooled by the refrigeration chilling system.Refrigeration is defined as the transfer of heat from a lower temperature to a higher temperature.This is done by the use of refrigeration devices such as compressor, condenser,expansion valve and evaporator.The main component used for the cooling of milk is chiller in a dairy industry.In a chillermilk is cooled up tothe 1 degree