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All kinds of Freon in walk-in cooler (1)
author: supermarket refrigerated showcase category: commercial refrigeration Views: 577Time: 2016-08-22
All kinds of Freon in walk-in cooler
Freon R12 chemical formula is CF2CI2, colorless, transparent, odorless, standard boiling point -29.8℃, condensation pressure lower than ammonia . Its vapor is colorless, non-toxic, non-combustible, non-explosive, and can decompose toxic phosgene (COCl2) at a high temperature of 400°C and in contact with an open flame, so it should be avoided to vent under an open flame. The solubility of water in R12 liquid is very small, and the solubility decreases with the decrease of temperature. Therefore, in order to prevent the occurrence of ice plugging in the walk-in cooler, the water content of R12 shall not exceed 0.025% (mass fraction). When filling the walk-in cooler with R12, use a dryer to absorb the moisture in R12, or install a dryer in the walk-in cooler. In a single-stage compression system, R12 liquid can be miscible with lubricating oil in any ratio. Therefore, in R12 refrigeration systems, coiled tube evaporators (including shell and tube evaporators) are generally used, with liquid in the upper part and air return in the lower part. A certain air return speed to ensure oil return.
R12 can dissolve a variety of organic substances, which will cause the expansion of the sealing material and cause the leakage of refrigerant in the walk-in cooler. Therefore, chloroprene elastomer or nitrile rubber must be used as the sealing material. R12 has strong permeability and can penetrate the joint gaps of the machine, small holes and threads in the castings, so the quality of the castings is high, and the machine tightness is better. The temperature range of R12 application is -60~10℃. It is mainly used in medium and small refrigeration devices, such as walk-in cooler, air conditioner, dehumidifier, small supermarket walk-in cooler, etc. Compared with ammonia and R22, R12 has a low saturation pressure at the same temperature, a low final compression temperature, a small refrigeration capacity per unit volume, and a large relative molecular mass, so it can also be used in two-stage compression refrigeration systems and large-scale capacity above 100 kW. In the centrifugal compressor unit.
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