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What problems should we pay attention to when choosing evaporator for water chiller

Shenzhen dongyuejin chiller plant briefly analyzes what should be paid attention to when selecting an evaporator for the chiller: the evaporator is one of the four major components of the refrigeration system and the ultimate embodiment of the refrigeration effect and efficiency. The evaporator is generally designed and equipped by the chiller manufacturer, and users do not need to choose. However, in order to better maintain the refrigeration system and ensure its efficient operation, the following points should be paid attention to:

(1) the influence of liquid level height on evaporation temperature. Due to the influence of the liquid column height of the refrigerant, the evaporation temperature at the bottom of the full liquid evaporator is higher than that of the liquid level. The evaporation temperature of different refrigerants at different liquid levels is affected differently by the hydrostatic height. No matter what kind of refrigerant, the lower the evaporation temperature of the liquid surface, the greater the influence of the hydrostatic height on the evaporation temperature. Therefore, only when the evaporation pressure is high, the effect of hydrostatic height on the evaporation temperature in the experiment of breaking force and elongation at break can be ignored. When the evaporation temperature is low, it cannot be ignored. In other words, it becomes uneconomical to use the full liquid evaporator at this time

(2) possibility of refrigerant freezing. If the evaporation temperature is lower than the solidification temperature of the refrigerant, it is possible to change the hydraulic oil refrigerant regularly. In the last process of the refrigerant, the temperature of the refrigerant is the lowest and the possibility of freezing is the greatest (for the refrigerant, please refer to the types and selection analysis of the refrigerant in the cold water machine cooling system). When water is used as the refrigerant, theoretically, the temperature of the inner wall of the pipe can be as low as 0 ℃. However, for the sake of safety, the temperature of the inner wall of the pipe at the outlet end of the last process is usually kept above 0.5 ℃. For the case that brine is used as the refrigerant, according to the same principle, the inner wall temperature of the pipe should be 1 ℃ higher than the solidification temperature of the refrigerant

(3) pressure loss of refrigerant in evaporator. When the refrigerant flows through the evaporator, the pressure loss will inevitably make P2 of the refrigerant at the outlet of the evaporator lower than the pressure P1 at the inlet after the pressure loading speed instigator is pre selected, thus reducing the suction pressure of the compressor and reducing the refrigeration capacity

according to different models, the choice of evaporator is also different. For example, the box type chiller uses a water tank coil evaporator; Shell and tube evaporators are used for open chillers and screw chillers; For acid and alkali resistant chillers, titanium tube evaporator or stainless steel plate exchanger can be selected. A kind of water chiller can be selected from a variety of options. Of course, it can be customized according to the needs of users

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