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[China Glass Net] There will be a problem in the winter doors and windows - the window room is full of dew. In professional terms, this is: condensation on doors and windows.
Dew condensation on the windows and doors is the condensation of dew or water on the interior surfaces of the doors and windows. When the surface temperature of the solid (glass, sash, window frame) is lower than the dew point temperature of the humid air adjacent to the surrounding area, the water vapor in the air becomes liquid water, and condensation on the cold solid surface causes condensation to form. When the exposure is severe or cannot evaporate quickly, water droplets will form along the edges of the glass. Condensation is less likely to occur on the doors and windows of the sunny side, and the kitchen and bathroom in the shaded area are more likely to show condensation.
Most people think this is a problem with insulating glass? Actually not quite, first of all, talk to you about the following:
1. "Insulating glass" and "vacuum glass"
Many times, everyone will listen to "vacuum glass" as "vacuum glass", or simply think that "insulating glass" is "vacuum glass". In fact, it is wrong. The hollow glass used in our ordinary plastic window is two layers. The glass, through the middle of the aluminum strip, desiccant and sealant, together, forms the natural space of the air layer in the middle, the air between the two layers of glass is a dry, relatively equal pressure space, not a "vacuum".
The "vacuum glass" belongs to the category of special glass. The interlayer in the middle of vacuum glass is indeed vacuumed. The glass of this process is more expensive, and it is only used in places where special requirements are required. Because the cost is high, the average family does not. Will be used, like on the plane, on the high-speed rail or in the army, special laboratories, training rooms, vacuum glass is used more, because vacuum glass is very energy-saving insulation, sound insulation and noise reduction is particularly strong, and can stay away from condensation upset.
2. Why do you put on a sealed three-layer insulation and sound-proof window glass instead of condensation, but the plastic window that is a bit permeable will not
Maybe you will be puzzled. The house thinks about the insulation and sealing of the three-layer glass-plastic window. It changes. As a result, there is a problem of condensation on the glass to the window sill. The situation is that there is a problem with the quality of the three-layer high-insulation plastic window? At this point, will you immediately call the manufacturer who made the window, and ask if the three-layer insulation window that you have made is not closed.
Let us take care of the following situations now:
Is the condensation inside the glass hollow layer, the air intake or the outside of the glass (inside)?
If the hollow glass hollow layer is dew condensation, air intake, fogging, cracks, and obvious spots, how can you wipe it off, then this is indeed a quality problem, the glass seal is not done well or the desiccant is not working, so In the case of you, you can ask the manufacturer who made the window to replace it for free.
If the outside of the insulating glass, that is, the indoor surface dew condensation, the situation of flowing down to the window sill is actually a normal natural phenomenon, especially when the temperature difference between indoor and outdoor is large, the condensation water is more obvious. A car family should be more aware of the condensation of the glass. When there is no ventilation inside the car, there will be a layer of fog on the window glass.
The conditions of condensation are that when the room has a certain temperature and humidity, the temperature of the air is higher than the temperature of the surface of the dew condensation object, and the temperature of the surface of the dew condensation object is lower than the dew point, the three relationship has a joint point. That is to say, the same indoor humidity and temperature are likely to cause condensation when the temperature of the indoor and outdoor surfaces of the door and window is low.
In the case of airtightness, the better the indoor insulation, the more obvious the situation of glass water vapor
When the indoor airtightness is not ventilated, the indoor heating temperature is high. When the outdoor temperature is below zero, the moisture in the indoor air will condense into water droplets when the window glass is accumulated. The water droplets accumulate to a certain extent, and the adhesion force is exceeded. It will drop down, the greater the indoor and outdoor temperature difference, the higher the indoor humidity, the more condensate will be, it will be like the netizen mentioned "when more, like a little rain down."
Then there are friends to say, my home is warm, the air is dry, and where the moisture. But the environment in which we live normally, the humidity of the air itself, the gas exhaled by the human body, the gas generated by various activities in the room, such as the breath in the winter, are all with moisture, which is normal humidity, but the kitchen The humidity in the bathroom and bath room is large.
Under the same circumstances, the plastic steel window, which is not so sealed, will be lighter. This is because the plastic window is a little airy, allowing the outdoor air to infiltrate and neutralize the temperature of the glass surface inside the room. The temperature difference naturally decreases, and the condensed water is naturally blown out and is not so obvious. However, the temperature in the room will be significantly lower and it will not save energy.
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