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walk-in cooler refrigerant fusion point
author: supermarket refrigerated showcase category: walk-in display coolers Views: 564Time: 2016-08-22
walk-in cooler refrigerant fusion point
walk-in cooler The area below the fusion point is the solid area. The mass fraction or solidification temperature corresponding to the walk-in cooler crystal point is called the walk-in cooler crystal mass fraction or the walk-in cooler crystal temperature, respectively. The combined crystal mass fraction of the sodium chloride salt aqueous solution was 23.1%, and the combined crystal temperature was -21.2°C. The crystal quality of the calcium chloride salt aqueous solution in the refrigeration system is 29.9%, and the crystal temperature is -55°C. In order to prevent salt or ice precipitation during the operation of the refrigeration system, the mass fraction should be selected so that the brine is in the solution area at the required brine temperature (the working temperature of the brine), and the quality of the salt in the brine solution should be taken into consideration. The greater the fraction, the greater the density and the greater the flow resistance, and the greater the mass fraction, the smaller the specific heat capacity. The flow rate of the brine solution required to deliver the same refrigeration capacity will increase, so when the brine solution does not freeze The quality score should be as small as possible. Generally, the solidification temperature corresponding to the brine solution is about 5°C lower than the evaporation temperature of the refrigerant, and the mass fraction should not be greater than the mass fraction of the crystal.
can determine the minimum cooling temperature of the solution according to the crystal temperature of the salt solution. The crystal temperature of the sodium chloride salt aqueous solution is -21.2°C, so it can be used as a refrigerant only when the refrigerant's evaporation temperature is higher than -16°C. As for the calcium chloride salt aqueous solution, since its crystal temperature is -55℃, it can be used as the refrigerant as long as the evaporation temperature of the refrigerant is higher than -50℃. Taking into account the heat transfer temperature difference, the working temperature of the brine solution is usually about 5°C higher than the evaporation temperature of the refrigerant. It should be pointed out that when the refrigeration system is running, the brine solution used as the walk-in cooler refrigerant will continue to absorb moisture in the air to reduce the mass fraction of salt and increase the freezing temperature. To prevent the brine solution from freezing, the mass fraction of salt in the brine should be checked regularly and salt should be added to the brine solution to maintain the required mass fraction.
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