Changes in the Cooling Capacity of Industrial Chillers

Changes in the Cooling Capacity of Industrial Chillers

We often talk about the cooling capacity of the chiller. In fact, the nominal cooling capacity of the 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 different ambient temperature and chilled water outlet temperature, the cooling capacity of the industrial chiller and the power consumption of the compressor also vary. Whether it is an air-cooled chiller or a water-cooled chiller, its cooling capacity increases with the increase of the chilled water outlet temperature and decreases with the increase of the ambient air inlet temperature.

Why does this happen? This is because when the outlet temperature of the chilled water increases, the evaporation pressure of the corresponding industrial chiller increases, the suction specific volume decreases, and the refrigerating capacity per unit volume and the refrigerating capacity of the industrial chiller both increase; when When the ambient temperature increases, the condensing pressure in the refrigeration system of the industrial chiller increases. Since the evaporating temperature remains unchanged, its suction ratio volume also remains unchanged, the compressor air transmission coefficient of the chiller decreases, and the cooling capacity per unit mass decreases. , so the cooling capacity of industrial chillers is also reduced.

The power consumption of the industrial chiller increases with the increase of the outlet temperature of the chilled water, and increases with the increase of the ambient temperature. This is because the evaporation pressure increases when the chilled water temperature of the chiller increases. The pressure remains unchanged), the compression ratio is reduced, and the power consumption is reduced, but at this time, the power required to increase the cooling 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 unchanged (that is, the evaporative pressure remains unchanged), and the compression ratio increases and the power consumption increases. There is a reduction, but the total power consumption of the compressor still increases.

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