Natural Refrigerant Compressor

A large number of "natural refrigerants" exist in nature, such as ammonia, hydrocarbons, carbon dioxide, etc. The application of ammonia has a history of over a hundred years, and many countries still use it in large-scale industrial refrigeration and food refrigeration.
Hydrocarbons have excellent thermal and heat transfer properties, and are fully compatible with all mechanical materials and oils. In fact, this working fluid has long been used in large-scale refrigeration systems in the petrochemical industry. The resistance that affects the widespread promotion of this type of refrigerant comes from its flammability. In Europe, this refrigerant has begun to enter the market of household refrigeration equipment, such as Germany, which already has a 90% coverage rate in its products. The Chinese refrigerator industry also has R600a products that use isobutane.
The application scope and prospects of combustible refrigerants are a very important issue, and their universal solution still requires a relatively unified international understanding, as it affects the international trade of refrigeration and air conditioning equipment. However, more experimental research and policies adopted by various countries on this issue are still needed to achieve this step, and it seems that it will take considerable time for the clues to emerge.
Due to the poor solubility of traditional mineral oils and synthetic oils suitable for CFC-12 and other CFCS working fluids with new HFCS working fluids such as R134a, new polar lubricating oils have been developed. The matrix of this lubricating oil is either polyesterPOE (referred to as ester oil) or polyethylene glycol PAG (referred to as ethylene glycol oil), which have good compatibility with HFCS new working fluids, This can avoid the accumulation of lubricating oil in the heat exchanger and ensure that the oil can smoothly flow back into the compressor.