Maintenance methods and precautions of semiconductor chiller?

Maintenance methods and precautions of semiconductor chiller?

(1) When inspecting the component with non-special equipment, the temperature of the hot end needs to be lower than 80C (including the change of current direction and the change of cold end to hot end) in the working parameters.

Without releasing heat to the hot end, turn on the electricity immediately for experiment, that is, touch the two ends of the air conditioner with your hand, and there will be a certain heat feeling. On the one hand, a little cold feeling is enough. Otherwise, due to the high temperature of the hot end and the short circuit or open circuit of the parts, the cold air is easily discarded.

(2) When checking the polarity of the cooling component under general conditions, the cold end of the cooling component can be placed upward, and the lead end faces the direction of the human body. In this case, the right lead is the anode, which is usually displayed in red.

On the left is the cathode, which is usually displayed in black, blue or white. This polarity is the way of wiring when cooling components are working. When heating is needed, just change the polarity of the current. The cooling operation needs to use DC power supply, and the reflection coefficient of the power supply needs to be less than 10%.

1. What are the reasons for the poor cooling effect of the FL +5°C ~ +35°C Water Chillers?

The cooling water pipe has a lot of scale or is blocked by sediment and organic matter, as well as water is analyzed after cooling at the gas side of the cooler, and is not discharged in time, which will affect the heat transfer area or heat transfer condition, and affect the cooling effect.

Poor cooling effect increases the temperature of the next stage, affects the performance curve of the next stage, and reduces its outlet pressure and flow.

In addition, when the suction volume of the lower level is reduced, the air volume of the previous level cannot be fully “eaten”, and it is easy to make the work of the previous level enter the surge zone, where the surge occurs.

The treatment methods are as follows: check and adjust the water temperature and pressure; If the water temperature and pressure are normal, stop the machine for disassembly and inspection, clean the cooler with physical and chemical methods or replace the cooler; If the cooler leaks, replace the cooler.

2. Abnormal heat exchange of cooler.

1. The outlet temperature at the hot side is higher than the design value, which is mainly caused by the problem of model selection, the flow at the hot side is higher than the design value, the plate is blocked or the flow at the cold side is small.

2 The outlet temperature at the cold side is too low, which is mainly due to the low flow rate at the hot side or the temperature lower than the design value, plate blockage, etc.