Proper choice of chiller oil

        Believe in friends all know each industrial chillers during normal operation are needed with appropriate refrigeration oil can ensure we use cold water machine, which is mainly used for lubricating oil lubrication in freezer parts, operation performance and service life of the compressor and it is closely linked, so selection and application of it, will may decide the efficiency and service life of our water chiller.

        In fact, oil cooling water machine which is different from other mechanical equipment, due to the use of occasions the refrigerant, refrigeration oil therefore need to select suitable for cold water machine ourselves, let us together with east star Tracy to find out how to give us the correct choice of chiller refrigeration oil right.

        1 Viscosity: the viscosity of refrigeration oil is an important parameter in oil characteristics, using different refrigerants to choose different refrigeration oil. In addition, the viscosity of refrigeration oil is also related to the temperature of the cold water machine, the temperature rises, the oil viscosity is reduced. Chiller refrigeration oil viscosity too big to make mechanical friction, friction heat and power starting torque increases, if the viscosity is too small, it will make the moving parts can form oil film required, can not due to lubrication and cooling effect.

        2 freezing point: freezing oil in the experimental conditions to stop the flow of temperature is known as the freezing point. In the refrigeration system, heat exchange equipment and pipelines, usually work at low temperature, and the pipe wall are more or less oil film, the freezing point of how high oil will affect the refrigerant flow, increase flow resistance, effect of heat transfer effect. In general, for freezing equipment, its freezing point should be the lower the better, such as R-22 of the compressor, refrigeration oil should be below -55. If used in cryogenic equipment, the freezing point should be lower.

        3 chemical stability and anti oxygen properties: pure refrigeration oil chemical composition is stable, not oxidation, not corrosive metal. However, when the refrigeration oil contains a refrigerant or water will produce corrosion, the oxidation of oil will produce acid, corrosion of metal. When the lubricating oil in high temperature, it will appear coke, if the material attached to the valve, will affect the normal work of the valve, while the filter and throttle valve will cause clogging. So it must be used with chemical stability and oxidation resistance are better refrigeration oil.

        4 insulation performance: in the semi closed and closed cold water machine, refrigerator oil and refrigerant directly and the winding of the motor and the terminal contact, thus freezing oil has higher breakdown voltage of insulating properties and good. Pure lubricating oil has good insulation performance, but its insulation performance will decline when it contains moisture, impurities and dust.

        5 due to different characteristics of various types of refrigerant, the refrigeration system working temperature difference, the refrigerator oil generally can be selected: equipment of low speed, low temperature freezing can be used lubricating oil low viscosity, low freezing point and high speed air conditioning equipment; or under the condition of freezing should be used lubricating oil viscosity, freezing point high.