We often talk about the cooling capacity of a chiller. In fact, the nominal cooling capacity of an industrial chiller refers to the cooling capacity when the ambient temperature is 35°C and the chilled water outlet temperature is 7°C. In actual operation, due to the ambient temperature It is different from the chilled water outlet temperature, so the refrigeration capacity of industrial chillers and the power consumption of compressors also vary. Whether it is an air-cooled industrial chiller or a water-cooled industrial chiller, its cooling capacity increases with the increase of the chilled water outlet temperature, and decreases with the increase of the ambient inlet air temperature.
Why does this happen? This is because when the chilled water outlet temperature increases, the evaporation pressure of the corresponding industrial chiller increases, the suction specific volume decreases, and the cooling capacity per unit volume and the cooling capacity of the industrial chiller increase; When the ambient temperature increases, the condensing pressure in the refrigeration system of the industrial chiller increases. Because the evaporation temperature remains unchanged, its suction specific volume also remains the same, the compressor air delivery coefficient of the chiller decreases, and the cooling capacity per unit mass decreases. Therefore, the cooling capacity of industrial chillers is also reduced.
The power consumption of industrial chillers increases with the increase of the chilled water outlet temperature and with the increase of the ambient temperature. This is because when the chiller's chilled water temperature increases, the evaporation pressure increases. If the ambient temperature does not change (ie condensation The pressure remains unchanged), the compression ratio is reduced, and the power consumption is reduced, but at this time, the power required for the increase of the refrigeration capacity of the industrial chiller is greater, so the total power consumption of the compressor is still increased.
If the ambient temperature increases and the condensing pressure increases, the chilled water outlet temperature of the industrial chiller remains the same (that is, the evaporating pressure does not change). At this time, the compression ratio increases and the power consumption increases. Then the required power will be slightly reduced due to the decrease in the cooling capacity. There is a decrease, but the total power consumption of the compressor is still increasing.
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