How to select important material of air-conditioner

today to share important material selection of air-conditioner, in the commercial freezer, there are a lot of material is particular, it is because of air-conditioner need to use in different places, to choose a special material. Such as: need more horizontal low temperature in the supermarket, convenience store requires more glass door commercial freezer. These are big, so small material? Such as refrigerant, today, to share with you the common R134a has a refrigerant compressor and refrigerant R12 compressor what are the difference. 一个。 Redesign of air-conditioner compressor structure: due to the everything chemical corrosion resistance and hydrophilic enhancement than R12, everything the ingredients do not contain chlorine, lubricity, make compressor parts cause adverse chemical change, thus the motor coil and insulation insulation class must be strengthened. Because its refrigeration efficiency under R12, compressor must be a series of effective optimization measures: adopt high efficiency compressor motor, and add back valve, effective control of compressor valve plates, in order to improve the efficiency: direct admission, connecting with hose will suction cavity muffler, in order to reduce heat loss. b。 price change of frozen oil: must be dissolved with refrigerant compressor refrigeration oil, and has good lubrication, sealing, low temperature liquid and chemical stability, etc. Due to R12 compressor of mineral oil do not mix with everything, so everything is applied to make refrigerant, refrigeration oil must be replaced. Is often used with everything for reciprocating compressor, dissolved or polyethylene glycol ester oil ( PAG) Oil. For rotary compressor, Japanese mitsubishi electric company developed low viscosity of hard alkylbenzene ( 想吃汉堡) Oil do freezing oil. For the refrigeration system of refrigerant R12 and everything to do, everything low evaporation pressure, condensation pressure high, the compression ratio is bigger. The refrigerating capacity of the low back pressure, everything is small, to obtain the same refrigerating capacity, need to choose from a few bigger, About 10%) The compressor. Due to the new lubricating oil ( Especially the ester type oil) With strong water imbibition, hydrolysis resistance strong ester oil react with water to sit in acid, acid and corrosion refrigeration compressor and pipes, even blocking of air-conditioner capillary, acid water and mineral oil, synthetic and ester decomposition metamorphism. So everything compressor for refrigeration system of water content, chlorine content, residual oil and the impurity content requirements is quite high, and the vacuum pump ( Ester oil) , connecting hose, quick connector, such as sealing ring need is special, and R12 system cannot be universal, leak detector to electronic leak detector instead of halogen leak detector. Just to share here now, in the next section will continue to give you say this knowledge of air-conditioner.
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