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    Frozen Refrigeration Units Most Often Heard Sep 15, 2017

    Frozen Refrigeration Units Most often heard

    What is the refrigerant in the refrigeration unit?

        There are many kinds of refrigerant in the refrigeration system, in different industries have different regions have different names, one of the most often heard are: refrigerant, snow, freon, I believe we are not familiar with the three names, Refrigerants, also known as refrigerant, in some areas of the South commonly known as snow. It is in the refrigeration system in the continuous cycle and through its own state changes in order to achieve the cooling of the working material. The refrigerant absorbs heat from the cooled medium (water or air, etc.) in the evaporator, and heats the heat to the surrounding air or water in the condenser to condense. The following macro series Xiaobian to bring you to understand the refrigeration refrigeration unit commonly used part of the refrigerant.

        Issued when the refrigerant has reached 80 to 90 kinds of refrigerant, and is constantly growing. But for the food industry and air conditioning refrigeration refrigeration unit only 10 kinds. Which is widely used only the following:

    Ammonia (code: R717)

        Ammonia is currently the most widely used medium-pressure medium temperature refrigerant. Ammonia solidification temperature of -77.7 ℃, the standard evaporation temperature of -33.3 ℃, at room temperature, the condensing pressure is generally 1.1 ~ 1.3MPa, even when the summer cooling water temperature up to 30 ℃ when it is impossible to more than 1.5MPa. Ammonia unit standard volume of cooling capacity of about 520kcal / m3.

        Ammonia has a good water absorption, even at low temperatures will not precipitate from the ammonia and freeze, so the system will not happen "ice plug" phenomenon. Ammonia does not play a role in corrosion of iron and steel, but ammonia contains water, corrosion of copper and copper alloy, and the evaporation temperature is slightly increased. Therefore, ammonia and copper alloy can not be used in ammonia refrigeration equipment, and the water content in ammonia should not exceed 0.2%.

        The critical temperature of ammonia is higher (tkr = 132 ℃), latent heat of vaporization is 1164KJ / Kg at atmospheric pressure, and the volume per unit volume is larger in standard working condition, and the size of ammonia compressor can be smaller.

        Pure ammonia has no adverse effect on the lubricating oil, but there is moisture, it will reduce the lubrication of frozen oil. Ammonia is not easy to dissolve in the lubricating oil, it is necessary to install the oil separator in the device, reduce the oil into the condenser and evaporator, to prevent the heat exchange surface is oil pollution after the heat transfer performance.

        Pure ammonia has no corrosive effect on steel, but when the ammonia contains water will corrode copper and copper alloy (except phosphor bronze), so in the ammonia refrigeration system for pipes and valves are not used copper and copper alloy.

        Liquid ammonia transparent colorless, ammonia steam colorless, with a strong stimulating odor. Ammonia has a greater toxicity to the human body, when the ammonia splashed on the skin will cause frostbite. When the ammonia vapor in the air volume of 0.5-0.6% can cause an explosion. So the concentration of ammonia in the air room should not exceed 0.02mg / L.