Saturation Pressure and Saturation Temperature of Industrial Chillers
The pressure and temperature of the refrigerant in the evaporator of the industrial chiller are the saturation pressure and saturation temperature of the refrigerant, which can be measured by the corresponding instruments installed on the evaporator of the industrial chiller. If one of these two parameters is measured, the value of the other can be found through the thermodynamic properties table of the refrigerant. When these two parameters can be detected, but they are different from the values displayed on the industrial chiller meter, we should check whether there are too many impurities mixed in the refrigerant of the industrial chiller, or the sensor and meter are damaged, etc. cause.
In fact, the evaporating pressure and evaporating temperature are closely related to the heat that the chilled water of the industrial chiller brings into the evaporator. When the cooling load of the industrial chiller is large, the return temperature of the chilled water of the evaporator will increase, which will cause the evaporating temperature of the industrial chiller to increase, and the corresponding evaporating pressure will also increase. On the contrary, if the cooling load of the industrial chiller decreases, the chilled water return temperature, evaporating temperature and evaporating pressure will all decrease.
In the actual operation of the industrial chiller, the cooling load of the unit often changes. In order to adapt the working performance of the industrial chiller to this change, the industrial chiller manufacturers use automatic control devices to adjust the energy of the industrial chiller. Maintain the pressure and temperature within the evaporator relatively stable within a small turbulent range. Under normal circumstances, when we assign an industrial chiller to an enterprise, its cooling capacity must be slightly greater than the cooling load it bears, otherwise it will not be able to obtain a satisfactory cooling effect during operation.
The setting value of the automatic control and protection components of the industrial chiller will keep the industrial chiller running under nominal conditions. However, if the outlet temperature of the chilled water of the industrial chiller is increased, it is very beneficial to its economy. Therefore, if the chiller meets the requirements of the enterprise for the use of the industrial chiller, the outlet temperature of the chilled water can be increased as much as possible.
In addition, the difference between the evaporation temperature of the industrial chiller and the outlet temperature of the chilled water can also increase or decrease with the increase or decrease of the cooling load of the evaporator. Under the same load, the heat transfer coefficient decreases as the temperature difference increases. In addition, the temperature difference is also related to the heat transfer area, and the dirt in the tube and the accumulation of lubricating fluid outside the tube also have a certain influence on it. In order to reduce the temperature difference and enhance the heat transfer effect, the enterprise must regularly remove the dirt in the water pipe of the evaporator of the industrial chiller, and actively take measures to lead the lubricating oil back to the oil tank.
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