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The solubility of refrigerant and lubricating oil in the display cooler is
author: supermarket refrigerated showcase category: commercial refrigeration Views: 555Time: 2016-08-22
The solubility of refrigerant and lubricating oil in the display cooler is
. From the perspective of heat transfer, we should choose a lubricating oil that has good compatibility with the refrigerant of the display cooler. According to the solubility of refrigerant and lubricating oil in the display cooler, lubricating oils can be divided into three categories: completely soluble oil, partially soluble oil and insoluble or slightly soluble oil. Polar lubricating oils such as polyester oil and polyol oil have strong water absorption. This feature is extremely unfavorable to the refrigeration system, so special attention should be paid when using it. Although the solubility of polar synthetic hydrocarbon oil to polar display cooler refrigerant is not as good as polyester oil, because certain additives are added to these oils, this type of lubricating oil can dissolve in polar display cooler refrigerant But it does not absorb water, which can avoid a series of problems caused by water absorption. In addition to considering the mutual solubility with the refrigerant, the viscosity of the lubricating oil should also be considered when choosing lubricating oil.
Generally speaking, the display cooler refrigeration system that works in a higher temperature range chooses a higher viscosity lubricating oil: on the contrary, choose a lower viscosity lubricating oil. For compressors with higher moving speed, choose lubricating oil with lower viscosity; on the contrary, choose lubricating oil with higher viscosity. According to the standards promulgated by the Ministry of Energy and Industry, there are currently three types of display cooler refrigeration oils produced and commonly used in my country: No. 13, No. 18 and No. 25. Among the three oils, the general ammonia display cooler compressor uses No. 13, the R22 display cooler compressor uses the No. 25, and the R12 display cooler compressor uses the No. 18. Some imported display cooler refrigeration devices have a certain reserve of refrigerator lubricating oil. Once they need to be replenished or replaced, in addition to the original refrigerating oil, the above-mentioned three domestically-produced refrigerants can also be selected according to the type of refrigerant used. .
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