How to Judge the Chilled Water Flow of the Chiller?
Under normal circumstances, when purchasing and designing a chiller, how to judge the chilled water flow of the chiller? From what aspects should we consider it comprehensively?
1. Detection of return water temperature and outlet water temperature of the unit (the unit needs to be in normal state):
30 minutes after starting up the unit, you can read the inlet and outlet water temperature of the unit through the parameters of the unit’s control system or the inlet and outlet water thermometers of the unit’s chilled water system, and the temperature of the inlet and outlet water can be read out. If the water temperature difference is too large, it means that the water flow of the water system through the plate type device is too small, which may cause the unit to fail to operate normally or be damaged.
2. Water pressure detection of the inlet and outlet pipes of the unit:
Through the detection of the return water pressure and the water outlet pressure value, check the water flow rate of the chiller under the pressure difference between the inlet and outlet water in the random manual of the unit, and check the water flow corresponding table or figure of the unit in the manual. In order to judge whether the water system is normal; and through this difference to judge which section of the water pipeline resistance value is too large, and make corresponding rectification plans and actions.
3. Detection of the suction temperature of the copper tube of the compressor (only in the cooling operation):
If the suction temperature of the compressor is detected to be lower than 0°C after the refrigeration is turned on for 30 minutes, it means that the water flow in the water-side heat exchanger is not enough, which causes the evaporation temperature and evaporation pressure to drop, and causes freon to flow to the compressor in the evaporator. The suction pipe is still evaporating and absorbing heat, so that the suction temperature of the compressor is lower than 0 °C; in addition, it is necessary to exclude the drop of evaporating pressure and evaporating temperature caused by the low water temperature set point; instead of standard low water temperature As long as the unit ensures that the compressor has a suction superheat of 6 to 8 °C, it can be considered normal. Therefore, under normal water flow, the suction temperature of the compressor will generally be greater than 0 °C, below this value, the problem of the water system needs to be eliminated.
4. Pump running current detection:
By detecting the running current of the pump and comparing it with the rated current, it can be judged whether the actual water flow is larger or smaller than the rated water flow of the pump. Combined with the previous parameters, an exact water system detection analysis and judgment report can be obtained.
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