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This post was last edited by Black gold on 2011-3-24 at 11:31. The refrigerant evaporates in the evaporator of the cooling system, absorbing heat from the air inside the vehicle and turning into a gas; it then transfers that heat to the surrounding air in the condenser, where it turns back into a liquid. The refrigerant primarily serves to transfer heat, carrying the heat from the air inside the vehicle to the air outside. www.pingyiao.com There are two commonly used refrigerants in cars: R12 and R134a. The main characteristic of R12 is that its scientific name is dichlorodifluoromethane. Most car air conditioners used to rely on R12 as a refrigerant. It possesses good thermodynamic, physical, chemical, and safety properties; its boiling point at one atmosphere of pressure is -30°C. However, it is highly harmful to the environment. At an altitude of 10–50 km above the Earth’s surface, there exists an atmospheric ozone layer. The ozone (O3) in this layer can absorb a large amount of solar ultraviolet radiation, protecting humans, animals, plants, and outdoor building materials from excessive exposure to such radiation. The atmospheric ozone layer serves as a natural protective barrier essential for human survival. Studies have shown that chloride ions in R12 cause severe damage to the ozone layer. The degradation of the ozone layer increases the intensity of ultraviolet radiation from the sun reaching the Earth’s surface, harming many organisms on Earth, disrupting ecological balance, and exacerbating the planet’s greenhouse effect. Therefore, R12 is no longer used in the car air conditioners manufactured in our country today. www.cpi-lube.com Main characteristics of R134a: Its scientific name is tetrafluoroethane, and its boiling point at one atmosphere of pressure is -27°C. It has thermodynamic properties similar to those of R12, but its cooling capacity is lower than that of R12. It contains no chlorine atoms, has an ozone-depletion coefficient of 0, and possesses a certain greenhouse effect. It is insoluble in mineral oil and partially soluble in synthetic oils. The molecular diameter of l is slightly smaller than that of R12, making it easier to leak outward through the rubber. Shanghai Pingyao Trading Co., Ltd. is the exclusive agent for CPI synthetic lubricants in the Chinese market. It is a professional company composed of a group of experts in synthetic oils and professionals in compressors. Currently, there is one warehouse in the Shanghai Waigaoqiao Free Trade Zone and another in the Putuo area, both of which are equipped with sufficient stock to serve compressor manufacturers, sellers within China, as well as distributors in the petrochemical industry across various provinces and cities. The main markets include the following areas: ◆ Hydrocarbon gas compressor oil ◆ Refrigeration compressor oil ◆ Air compressor oil ◆ Compressor oil for refrigerators and freezers ◆ Oil for synthetic equipment ◆ Food-grade lubricants ◆ Food-grade low-temperature heat transfer oils ◆ Special oil for wind power gearbox gears