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Condensation refers to the phenomenon where water vapor in the air condenses into water droplets on the low-temperature surface when the surface temperature of the air conditioner's air outlet is lower than the dew point temperature of the surrounding air. Especially in the hot and humid summer environment, the indoor air humidity is relatively high and the dew point temperature rises. If the supply air temperature is too low (lower than the dew point temperature of the air), condensation water is likely to form on the air outlet louvers.
This situation is relatively common in the early stage when the air conditioner is just turned on and is a normal physical phenomenon. Especially for multi-split fluorine systems, due to the lower temperature of the refrigerant, the supply air temperature is also correspondingly lower, and the risk of condensation is higher. Water system air conditioners can effectively reduce the probability of condensation by adjusting the temperature of chilled water/hot water and appropriately increasing the supply air temperature.
Analysis of the Main Causes of condensation at the air outlet
The indoor humidity is too high
The air humidity in the air-conditioned area is relatively high, and the dew point temperature rises accordingly. Once the supply air temperature drops below this dew point, condensation is likely to occur.
2. The design of the fresh air and exhaust systems is unreasonable
If the fresh air volume is insufficient or the exhaust air is too strong, it will cause negative pressure to form indoors, allowing untreated moist outdoor air to seep in through gaps in doors and Windows and other means, increasing indoor humidity and raising the risk of condensation.
3. Large temperature difference air supply, with the air volume and cooling capacity not matching
The cooling capacity of the air conditioning unit is too large but the supply air volume is too small, resulting in a large temperature difference in the supply air and a low surface temperature of the air outlet, which intensifies the tendency of condensation.
4. The material of the air outlet has strong thermal conductivity
Aluminum alloy air outlets have good heat conduction performance, and their surface temperature drops rapidly, making them more likely to fall below the dew point of the air and thus causing condensation. In contrast, wood or ABS plastic materials conduct heat slowly and are less prone to condensation.
5. Abnormal drainage system of the indoor unit
If the condensate pipe is clogged or the drainage slope is improper, causing water to accumulate in the water collection tray, water mist may be carried out during the operation of the fan, which may be mistakenly thought to be condensation at the air outlet. In fact, it is a leakage caused by drainage problems.
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