Supermarket refrigerated showcase refrigerant salt solution
supermarket refrigerated showcase refrigerant salt solution because the salt solution in supermarket refrigerated showcase has a strong corrosive effect on metals. The greater the oxygen content of the brine solution, the more corrosive to metals. Therefore, the salt solution system in the supermarket refrigerated showcase must take necessary anti-corrosion measures. The use of a closed brine solution system can reduce the contact between the brine solution and the air and reduce the corrosion of the system. A certain amount of corrosion inhibitors, such as sodium hydroxide and sodium dichromate, can also be added to the brine solution. Usually 1m3 calcium chloride salt solution needs to add 1.6kg sodium dichromate and 0.45kg sodium hydroxide. lm3 sodium chloride salt solution should be added with 3.2kg sodium dichromate and 0.89kg sodium hydroxide to make the salt solution weakly alkaline (pH value is about 8.5). Because sodium dichromate, sodium hydroxide, and saline solution have corrosive effects on human skin, be careful when preparing saline solution. After adopting anti-corrosion measures, the corrosion effect of salt solution on metals can be reduced. But in any case, the corrosiveness of saline solution should not be ignored. In the supermarket refrigerated showcase, organic compounds or their aqueous solutions can be used when the salt solution has a strong corrosive effect on metals, or in some cases when the sodium chloride or calcium chloride salt solution cannot meet the low temperature requirements on the process As a refrigerant. For example, glycerol is an extremely stable compound. Its aqueous solution is non-corrosive and non-toxic, and can be directly contacted with food. It is a good refrigerant carrier. The characteristics of the aqueous solution of ethylene glycol are similar to that of glycerol. Although it is slightly toxic but not harmful, its viscosity and price are lower than that of glycerol. Ethylene glycol is commonly used as a refrigerant in ice storage systems. In addition, organic compounds such as dichloromethane, trichloroethylene (C2HCI3, R120), monofluorotrichloromethane, etc. can be used as refrigerants. These organic compounds have relatively low freezing temperatures and are suitable for cryogenic refrigeration devices. For organic compounds with relatively low boiling points, a closed refrigerant circulation system should be used. Trichloroethylene has a higher boiling point (86.7°C), so it can be used in an open refrigerant circulation system. The thermophysical properties of commonly used refrigerants are for reference when selecting refrigerants in supermarket refrigerated showcase. The above articles are from refrigerated showcase supermarket refrigerated showcase and commercial refrigeration. For details, please log in: www.ihdjx.com Free Order Hotline: +86 18019567573 Contact: Mr. Shao 26066250@qq.com
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