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Refrigeration is the process of removing heat from a low temperature region and transferring it to a higher temperature region with the help of mechanical work. In dairy plants, refrigeration is essential for maintaining the quality and safety of milk and milk products. Milk is highly perishable and microbial growth occurs rapidly at normal temperatures, therefore cooling is required immediately after milking and during processing, storage, and transportation. Most dairy refrigeration systems operate on the vapor compression refrigeration cycle, which works on the principle of heat absorption during evaporation and heat rejection during condensation. The basic principle of refrigeration is based on the fact that when a liquid refrigerant evaporates, it absorbs heat from its surroundings. This absorption of heat results in cooling of the environment where the refrigerant evaporates. The refrigerant _________ ______ ___ ________ _________ ________ _______ ________ __________.
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