Comparison of r134a refrigerant and r12 air conditioning refrigeration system

Compared with R-12 air conditioning system, R-134a has similar thermal properties and system structure. The biggest difference is the refrigerating oil. Refrigeration oil is a liquid lubricant that is compatible with refrigerants, can lubricate the compressor and has stable chemical properties. R-12 refrigeration oil is a mineral oil that is soluble in R-12. People in the air-conditioning industry know that R-134a is a polar refrigerant with strong molecular polarity. Due to its polarity, other mineral oils such as alkyl oils and naphthenic mineral oils are completely incompatible. Yes, it must use glycol (PAG) and polyether (POE) refrigerating oil. The ethylene glycol (PAG) and polyether (POE) refrigerating oils are not completely compatible with R-12 refrigerant, so they cannot play a smooth role in the air-conditioning system. Due to the particularity of this lubricant, R- 134a air-conditioning system has different requirements for rubber material and its own nature from R-12, so R-134a can only work in the system specially matched with it. For all R-134a air-conditioning systems used in vehicles, the factory will Compressor, condenser, evaporator. The 134a mark is marked on the rubber tube and filling equipment to prevent misuse.

Since the price of qualified and up-to-standard R-134a refrigerant on the market is about three times that of R-12, some people install air conditioners in their cars to supplement the refrigerant. In order to make huge profits or seek cheap prices, the R-134a air-conditioning system is changed to be filled with R-12 refrigerant. Although it can also send out cold air, it will damage the compressor. Because general compressors have been injected with some homogeneous refrigerant oil, even if all of them are poured out, some refrigerant oil will remain in the machine. The refrigerant oil of the two refrigerants mixed together will gradually lose its lubrication effect and damage the air-conditioning compressor. It is said that the gain is not worth the loss, so industry experts suggest that which kind of refrigerant should be charged into which kind of air-conditioning system, and cannot be used interchangeably. If fake refrigerants are used in car air conditioners, due to compatibility issues, the oil return of the compressor will inevitably deteriorate, causing rapid damage to the compressor or accumulation of refrigerated oil at the bottom of the evaporator to affect heat exchange, resulting in extremely poor air conditioning effects. In addition, the latent heat of evaporation of most fake refrigerants (referring to the heat required to transform a substance from liquid to gas at a constant temperature) is small, and it is inevitable that the air-conditioning effect will deteriorate.

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