There is too much water in the window glass. What happened? Is it glass?

In winter, doors and windows will encounter a problem-the window room is full of dew. In technical terms, this is: condensation on doors and windows.

Dew on doors and windows is dew or water mist condensed on the indoor surfaces of doors and windows. When the surface temperature of solids (glass, window sash, window frame) is lower than the dew point temperature of humid air nearby, the water vapor in the air becomes liquid water and condenses on the cold solid surface, which will produce dew condensation. When the condensation is serious or can't evaporate quickly, water droplets will form and flow down the edge of the glass. On the positive side, dew on doors and windows is less common, but on the negative side, dew in kitchens and bathrooms is more common.

Most people think this is the problem of insulating glass? Not exactly. First of all, let me tell you the following points:

Dew condensation in the glass hollow layer, in the air inlet or outside the glass (indoor surface)

If there are dew, air intake, fogging, cracks and obvious spots on the hollow layer of insulating glass, and you can't wipe them off, then this is really a quality problem. The glass seal is not well done or the desiccant is not good. In this case, you can ask the window manufacturer to replace it for free.

Dew condensation on the outside of insulating glass, that is, the indoor surface, is a normal natural phenomenon, which flows down to the window sill, especially when the temperature difference between indoor and outdoor is very large. Car owners should be more aware of glass condensation. When the car is not ventilated, there will be a layer of fog on the window glass.

The condition of condensation is that when there is a certain temperature and humidity in the room, the temperature of air is higher than that of the surface of the condensation object, and the temperature of the surface of the condensation object is lower than the dew point, and there is a junction between them. That is to say, when the indoor humidity and temperature are the same, but the indoor temperature of doors, windows and glass is low, condensation is easy to occur.

Under closed conditions, the better the indoor thermal insulation, the more obvious the water vapor in the glass.

When the room is closed and there is no window ventilation, the indoor heating temperature is high, and when the outdoor temperature is below zero, the moisture in the indoor air will condense into water drops when it meets the window glass. When the water drops accumulate to a certain extent and cross the adhesion, they will flow downstream. The greater the temperature difference between indoor and outdoor, the higher the indoor humidity, the more condensed water will be, and it will "drip like a light rain" as netizens said.

A friend said, but my home is warm, the air is dry and there is no moisture. But our normal living environment, the humidity of the air itself, the gas exhaled by the human body, the gas produced by various indoor activities and so on. They are all wet and belong to normal humidity, but the humidity in the kitchen, bathroom and bathroom is the highest.

In the same case, the less sealed plastic-steel window will show less, because the plastic-steel window is a little ventilated, allowing outdoor air to seep in, neutralizing the temperature of the indoor glass surface, naturally reducing the temperature difference, and the condensed water will naturally dry out, which is not so obvious. However, the indoor temperature will be obviously reduced, which will not save energy.

What if the window glass and the sunny roof glass frost in winter?

Without additional cost, the following methods can alleviate the phenomenon of glass condensation:

The protective film should be torn off in time to allow the wood to breathe normally, to prevent the surface from whitening and to avoid being torn off after a long time.

Proper ventilation by opening the window every day can reduce the air humidity and eliminate the moisture generated during the day's activities. Similarly, dewdrops with glass knots can be dried normally.

In the space with exhaust fan, the exhaust fan can be turned on properly, which can reduce or eliminate the problem of condensation.

If you feel that the windows are ventilated and cold, you must wipe off the dew on the glass with an ordinary rag to prevent the dew from forming water to flow to the windowsill and the ground and damage the interior decoration.

Stick an anti-fog film on the glass. Bian Xiao tried to put a layer of anti-fog film on the glass mirror in the bathroom, and found that the mirror was not so foggy that it was not clear. Although the cost has increased a little, I might as well have a try.

Even the energy-saving window with the least possibility of condensation depends on the indoor relative humidity. If the relative humidity exceeds 40%, even the best high-performance glass will condense when the outdoor temperature is -20℃ or colder.

For doors and windows, while enjoying the high performance of aluminum-clad wood doors and windows, especially in the cold northeast, many owners will correctly handle and alleviate this phenomenon.