What is the fresh air system? For those of you who haven't heard of it, let me tell you briefly what a fresh air system is.
Have you noticed that many shopping malls, stations, hospitals, hotels and other large public Spaces do not have Windows, and there are many people inside, but the air is not stuffy, because there are fresh air systems.
The main function of the fresh air system is to bring in the fresh air outside and discharge the dirty air with high carbon dioxide content inside.
While the household fresh air system generally has more functions. The advanced fresh air will filter the air sent in first (such as removing haze) and recycle heat (saving air conditioning energy) at the same time of ventilation. Note that the installation of fresh air in the home must have a filtering function, otherwise there is no difference with ventilation fans!
What's the use of fresh air? Can you think of any advantage in not opening the window? There are several obvious benefits.
1, isolation of noise outside the window. Closing the window and not closing the window noise difference is quite large, of course, this also depends on the window itself and the environment outside the window.
2, reduce external dust. Not opening Windows can naturally reduce outdoor dust coming in, which also depends on the local air quality and the environment around the house, such as haze days, such as whether the house is near the road, such as whether there are construction sites around.
3, reduce the impact of returning to the south. The main reason is to open a window. After opening a window, the warm and humid air with high outdoor humidity will condense into water when cold ceramic tiles or other materials are encountered. The effect of not opening a window is very small.
4, protect allergic constitution. I have personally experienced the above three points, but I have no right to say on this one. But I have heard that some people with physical problems will be affected by pollen in the air in spring, and hiding at home without opening the window can relieve a lot.
If none of the above seems to work for you, then fresh air is a tax on intelligence. So whether the fresh air is useful depends on whether the surrounding environment of the house is good or not, and whether the people living in it have these needs.
Can fresh air remove formaldehyde?
Does the fresh air system help in removing formaldehyde? Indoor formaldehyde is mostly free from the urea formaldehyde glue in the inferior plate, will continue to release, eradication may take a few years or even longer, and it is best to open Windows all the year round ventilation dilution, a drop of ink water into the river is ignored, indoor air exhaust to the outside is ignored.
And the window ventilation can not be carried out every day, all kinds of circumstances are not suitable for the window: for example, the renovation of a new home did not stay in the road far every day to open the window is not convenient; For example, no one at home closes the window for fear of rain; For example, if there is fog and haze outside, the air will be worse if you open the window; For example, in the winter and summer after the air conditioning to close the window and so on.
The fresh air system can exchange indoor air and outdoor air, so theoretically, it has a similar effect with opening the window, of course, the ventilation efficiency is certainly not as high as opening the window. Although the fresh air system itself will not remove formaldehyde, but through the exchange of fresh air to indoor formaldehyde and other harmful gases are diluted. Diluted to a harmless concentration is equivalent to removing formaldehyde, so I personally think it works in theory.
Can reduce indoor dust accumulation?
Because if the new air system is opened for a long time, there are almost no Windows in the home. The actual feeling is that the dust in the home is really less, but I want to explain that the less dust is not necessarily due to the new air. Another point is that my family has used the dryer for a long time, and the wool of clothes has been collected, which has a great influence.
I believe that many people will be interested in the functions mentioned above, so I will briefly introduce how to choose, mainly focusing on three points: initial investment, use effect and later operation and maintenance cost.
Initial investment
The most important initial investment is the cost of equipment. And the cost of equipment and air volume size, filter material is closely related to the pros and cons. The higher the air volume, the higher the cost of equipment.
The national standard of air change in public places is 30m³/ hour per person, but the average number of people in the home is calculated according to the area. The standard is about one time per hour for air change in the home. Take 100 square house as an example, according to the height of 2.5 meters, the indoor air is 250m³, that is to say, choose about 250 air volume on the line.
I don't recommend buying something with too much air unless you're a villa. On the one hand, the price of large air volume machine is certainly more expensive, on the other hand, usually open large air volume noise will increase, my personal feeling is that the host in the case of indoor people can almost only tolerate 300 air volume noise. However, in order to save the initial investment, it is not recommended to choose equipment with too small air volume. Without enough fresh air, pollutants tend to build up inside, and that's meaningless.
If the fresh air system does not have filtering function, it is equivalent to a ventilator. Therefore, it is recommended to choose the filter function, and the filtering effect is better, to solve the PM2.5 in addition to haze.
The vast majority of household fresh air on the market has the function of removing haze, but the difference between filter material and filter material is big. Not all filter materials have the advantages of small wind resistance and large dust capacity. The better the new fan with the filter material, the more expensive the equipment will be.
There are basically two kinds of commonly used filtration technologies for fresh air systems, one is physical filtration (filter) and the other is electrostatic dust removal technology.
Electrostatic dust removal technology, the advantage is that it can be reused, with a period of time to clean yourself on the line, no supplies. The problem is to be able to produce ozone, of course big brand product can accomplish ozone amount to accord with gb for certain.
The filter is similar to the air purifier, divided into coarse filter (to solve dust, flying insects and so on), super filter (to solve PM2.5), is certainly the higher the accuracy of filtration, the better. Of course, products with high filtration accuracy will also have a high price, which will increase wind resistance, reduce air volume and increase noise.
In addition, the filter is consumable, with a period of time, dust collection will be replaced, change the filter is also a long-term need to spend money, the specific amount of money depends on the local air quality, whether the haze is serious, usually open the use of fresh air time and so on.
Late service cost
Later operation and maintenance cost: mainly operation electricity charge and filter material replacement cost.
In addition to being closely related to the power of the equipment, there is also an important parameter called heat exchange efficiency.
Heat transfer
If there is no heat exchange, summer air conditioning, indoor 26 degrees, outdoor 40 degrees, direct hot air blowing in, not only uncomfortable, and air conditioning energy consumption will certainly become high; The same is true in winter, and cold winds can cause colds.
As has been said before, if the fresh air system is normally on, the consumables will be a long-term cost. If the metal material that can be cleaned is used, the later use cost can be reduced. Generally speaking, the annual expenditure of filter material replacement of fresh air system will be less than 1000 yuan.
Compared with the difference of cost however, what needs to be emphasized is to choose the brand that after-sale service has safeguard, beware of some small business flash in the pan, encounter the phenomenon of consumables such as filter net cannot be bought after buying a product.
Replace the filter material
As has been said before, if the fresh air system is normally on, the consumables will be a long-term cost. If the metal material that can be cleaned is used, the later use cost can be reduced. Generally speaking, the annual expenditure of filter material replacement of fresh air system will be less than 1000 yuan.
Compared with the difference of cost however, what needs to be emphasized is to choose the brand that after-sale service has safeguard, beware of some small business flash in the pan, encounter the phenomenon of consumables such as filter net cannot be bought after buying a product.