"How do you ventilate a passive house with such a small window? ”Maybe it's because I have too many questions, and the agent directly leaves me with a sentence:These 5 kinds of household appliances are designed to treat all kinds of poor ventilation problems. I researched it afterwards and even bought some to try it at home, and found out that it was really true!The apartment only has a small window, how can it be ventilated? ”
There is no wind in the pure sunny house, how to ventilate? ”
Loft just looks good, people who have lived there say boring.
Although I still didn't buy a house from that agent that time, I still thank him for letting me prostitute the knowledge for nothing.
#01.Fresh air system
Passive houses are characterized by "good insulation", and the resulting problem is poor ventilation (small windows). The fresh air system is the standard in passive houses
Fresh air system host.
Installed on the ceiling, it is very similar to the air conditioner. It serves two purposes
Ventilation is a bit similar to an exhaust fan, but not quite the same. The exhaust fan blows the indoor air to the outside, and the fresh air system brings the outdoor air into the room. At the same time, there is also a filtration effect, which is "filtered and then blown indoors", which is not afraid of outdoor environmental pollution.
Constant temperature, almost all fresh air systems have a "heat exchange" function. The temperature of the air blown into the room is not more than 80% different from the room temperature. When there is heating in the room in winter and air conditioning in summer, there is no fear that ventilation will affect comfort.
In other words, the fresh air system is the best alternative to open windows for ventilation, even better than open windows for ventilation. The only drawback was the installation time: it had to be installed before the renovation, because the pipes needed to be covered by a suspended ceiling.
#02.Fresh air fan
What should I do if I have already moved in? You can take a look at the new fan - the appearance is a bit similar to the air conditioner, but the air conditioner is installed against the ceiling, and the installation height of the new fan is lower, and it is longitudinal.
The new fan needs to be installed by punching holes in the exterior wall.
The function of the fresh air fan is very similar to the fresh air system, if you want to find some differences, it is probably like this
The air change of the fresh air fan is lower, generally not more than 100 m h, and the fresh air system is at least 300 m h. Therefore, the fresh air system can be used for the ventilation of the whole house, and the fresh air fan needs to be installed in each room.
The new fan, like an air conditioner, can be installed at any time. But after installation, it is also like an air conditioner, which needs to occupy indoor space, and it will look crowded on the outside, while the fresh air system is hidden.
Effect of new fan installation.
Or you can say this: if you are already occupied, or just a certain room is not well ventilated, it is recommended to choose a new fan. Otherwise, the fresh air system is more recommended, with good appearance, strong ability and high cost performance.
#03.Fresh air conditioning
Some air conditioners also have ventilation function, and its air conditioning pipe is divided into two parts. In addition to the traditional direct cooling section, there is also a fresh air section, which is specially designed to transmit and filter outdoor air.
The difference between the fresh air function on the air conditioner and the fresh air system and fresh fan is:
The ventilation efficiency is similar to that of a fresh fan, but there is no heat exchange function. The air conditioner can cool or heat, and the air blown in will first heat up or cool down near the evaporator to ensure that the temperature of the air blowing in is appropriate.
The heat exchange function is "zero energy", and changing the temperature through the evaporator is as energy-intensive as turning on an air conditioner. So if you are not using the air conditioner, if you turn on the fresh air function alone, the cost will be higher.
The filter element of the fresh air conditioner needs to be replaced regularly.
Fresh air conditioners are suitable for users who have the pursuit of quality of life and feel too bored in the air-conditioned room for a long time. If it's just to improve the ventilation problem in your home, a fresh air conditioner may disappoint you.
The first three types of appliances are "external circulation", which is to bring outdoor air into the room. Let's talk about the following two products, "internal circulation", that is, to improve the indoor environment on the basis of not introducing outdoor air.
If you open the window and there is no wind, you need to consider the external circulation; You don't want to open the windows or need to ventilate quickly(e.g. someone smoking indoors).users, need to consider the inner loop.
#04.Air purifiers
The principle of an air purifier is to suck air into the body, filter it through a filter, and then blow it into the room. Suck and blow repeatedly until all the air in the room is filtered.
The biggest difference between air purifiers and fresh air products is:
Fresh air can bring in outdoor air, but it dilutes indoor air. For example, if you light the aromatherapy indoors, it will be odorless after turning on the fresh air; If the air conditioner or heating is turned on in the room, even if there is a heat exchange function, it will have an impact on the indoor temperature (the heat exchange rate is only 80%).
The "freshness" of the air is different, or "the ratio of air is different". For example, after a night's sleep, the air in the room has a lot of carbon dioxide, and oxygen needs to be introduced. At this point, you need to turn on the fresh air, not the air purifier.
Filters for air purifiers.
The air purifier is suitable for those who need to make PM2 in the room5 and PM10 users, such as smoking, lighting mosquito coils, turning on humidifiers, stir-frying (range hoods do not work well), etc.
#05.Air circulation fan
This is the lowest cost air circulation method, not the best price, no consumables, not much electricity. The room with poor ventilation always feels very stuffy, and to improve the problem of "stuffiness", you can use an air circulation fan.
Compared with ordinary electric fans, air circulation fans have two major differences
The air circulation fan has a longer air supply distance, so it can circulate all the air in the room. In addition, the wind sent out by the circulating fan is concentrated, so it can "circulate" the indoor air, not just a gust of wind blowing through.
The air volume of the air circulation fan is larger, the electric fan is about 3m s, and the circulation fan can reach more than 20m s. In addition, the swing head angle of the circulating fan is more, and in addition to shaking the head left and right, it can also shake the head up and down, and every corner can be blown to every corner.
Whether it's winter or summer, the air in the room circulates quickly when the air circulation fan is turned on. When it's cold, don't blow on people, you won't feel cold, you will only feel the air is refreshing.