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Causes of condensation at the air outlet of central air conditioning and its treatment

Update:12-09-2020
Summary:

First understand the cause of condensation, why does it […]

First understand the cause of condensation, why does it occur?
At a certain atmospheric pressure, the temperature at which water vapor in the air condenses into water (condensation) when the moisture content remains unchanged. When d does not change, the air temperature drops and changes from an unsaturated state to a saturated state. At this time, the relative humidity of the air j = 100%. In air conditioning technology, the air is cooled to the dew point temperature to achieve the purpose of dehumidifying and drying air. Dew point (or frost point) temperature: refers to the temperature at which the air is cooled to saturation when the water vapor content and air pressure do not change. To put it vividly, the temperature at which the water vapor in the air turns into dew is called the dew point temperature. Dew point temperature is a temperature value, but why use it to express humidity? This is because when the water vapor in the air has reached saturation, the temperature is the same as the dew point temperature; when the water vapor is not saturated, the temperature must be higher than the dew point temperature. Therefore, the difference between the dew point and the air temperature can indicate how far the water vapor in the air is from the saturation state.
Condensation in daily life is mainly due to the large difference between the surface temperature of the object and the ambient temperature (the surface of the object must be a low temperature body), so that too much water vapor will precipitate from the ambient air and condense into water droplets on the surface of the object . The most obvious example is in summer, due to the temperature difference, the water vapor in the air will immediately form dew on the outer packaging of the ice drink. We only need to isolate the surface of the object from the air, and the water vapor in the air will naturally not form condensation on the surface of the object. The dew point is not affected by temperature, but by pressure.
Ways to solve the condensation problem
According to the above analysis, it is known that the root cause of condensation is that the temperature of the air outlet is lower than the dew point temperature of the indoor air. The methods to solve the condensation problem are summarized as follows:
1. Minimize the number of opening doors and windows, and check whether the room is not sealed enough from the outside world;
Reminder: In the summer, after raining and sunny, the indoor humidity is high, which makes people feel sultry and uncomfortable. Some people will open the window to turn on the air conditioner. This is the main cause of condensation at the air outlet of the air conditioner. It also increases the power consumption of the air conditioner. When the air conditioner is cooling, a part of the cooling capacity is removed. The room will become dry after the air conditioner is turned on for a long time. If the humidity is controlled below 60%, the human body will feel very comfortable.
2. Increase the air supply volume, reduce the air supply temperature difference, try to adjust the wind speed to the highest level or open the regulating valve as much as possible; (if a wind cabinet or air plate with a wind valve is added to the air duct)
3. If the side air supply is used, the horizontal shutters should be adjusted to blow upwards as much as possible to make the cold air circulate. The cold air blown by the air conditioner contains heavier moisture, and the cold air will fall naturally after it is sent high. Big loop.
4. If possible, a thin layer of PE insulation board thermal insulation cotton can be attached to the edge of the air outlet.
5. Change aluminum windows to plastic windows or wooden windows.
6. Increase the set temperature. The temperature is set at about 26°C.
7. Reduce the amount of fresh air to lower the indoor dew point temperature.

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