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display cooler refrigerant (1)
author: supermarket refrigerated showcase category: walk-in display coolers Views: 579Time: 2016-08-22
display cooler
display cooler There are many types of refrigerants, and the following three types are commonly used.
1) Water is a commonly used refrigerant for display cooler. The display cooler refrigeration device cools the water to a certain temperature and sends it to the heat exchanger to exchange heat and moisture with the air; the air is cooled to a certain temperature and humidity requirements and then sent to the warehouse. Since the freezing point of water is 0°C, if the temperature of the refrigerant is required to be lower than 0°C, other refrigerants with lower freezing points should be used, such as brine solution or aqueous solutions of organic compounds such as ethylene glycol and propylene glycol.
2) Salt solution, commonly used salt solution is a solution composed of sodium chloride, calcium chloride, magnesium chloride and water. The lowest available display cooler temperature of the saline solution is related to the mass fraction of the salt in the saline solution. The relationship between the mass fraction of sodium chloride and calcium chloride in the brine solution and the solidification temperature, the solidification temperature lines of different salt solutions are different. This turning point is called the ice salt crystal point. On the left side of the ice-salt crystal point, as the mass fraction of sodium chloride and calcium chloride increases, the solidification temperature decreases. On the right side of the crystal point, the situation is the opposite. The freezing temperature line of the brine solution divides it into four zones. The upper part of the curve is the solution area. When the mass fraction and temperature of the salt in the brine solution are both in this area, neither salt nor ice precipitates in the solution. The left half of the curve (above the dotted line) is the ice-saline solution area, that is, when the mass fraction of salt in the saline solution is lower than the mass fraction of the fusion point, the temperature is lower than the solidification temperature under this mass fraction and higher than the fusion point When the temperature is higher, ice will be precipitated, so the curve on the left side of the fusion point is also called the ice precipitation line. The right half of the curve (above the dotted line) is the salt-saline solution area. When the mass fraction and temperature of the salt in the display cooler refrigerant brine solution are in this area, salt is precipitated in the brine solution, so the curve on the right is also called the salt precipitation line.
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