However, many decoration users have some misunderstandings when purchasing the fresh air system, that is, they pay too much attention to the brand, power and filtration grade of the fresh air host and are indifferent to other fresh air materials.
You know, fresh air belongs to the ventilation system. Since it is a system, it must be used together with a variety of equipment and materials under the corresponding working conditions, and complement each other, so as to play the greatest role of the system.
Because the fresh air system needs a lot of materials, Bian Xiao divides it into three parts: main engine, air distribution and pipeline. A standard, effective and complete fresh air system must have these three parts.
First, the fresh air host
Host is the core of fresh air system. Now there are many brands of fresh air host in the market: Japanese, German, American, legal and Chinese companies abound, but the factors that determine the quality of a host are nothing more than the following three points.
1. Engine
2. Heat exchanger
3. Filtering method
Motor? It provides power for fresh air, so the quality of the fan determines the air supply volume, noise level and energy consumption of the fresh air main machine. How to balance and optimize the three to reflect the technical differences of host manufacturers can be compared by consulting manufacturers.
Heat exchanger? At present, the heat exchangers on the market basically belong to total heat exchange (temperature and humidity are exchanged, but the conversion is lossy). The fresh air main engine can achieve a heat exchange rate of more than 70% in the state of full heat exchange, and it is an excellent product.
Filtering method? At present, there are two mainstream filtration methods: pure physical filtration (depending on the filtration grade of the filter element) and electrostatic dust collection filtration (relying on the generated electric field to adsorb particles). The two filtering methods have their own advantages and disadvantages, and the filtering methods chosen by host manufacturers are also different.
Although HEPA's filter element can filter PM2.5 particles, it will be blocked soon after use because of the small gap between fibers, and it needs to be cleaned and replaced in 2-3 months. Electrostatic precipitation filtration may produce ozone, and whether it really doesn't need cleaning is also controversial.
Second, fresh air (wind)
Some decoration users may wonder, isn't the fresh air system just a host with a few fresh air pipes? Why is there more "air distribution" devices?
This actually goes back to the history of modern fresh air system, and the earliest "fresh air" is actually just ventilation. Functionally, the simplest exhaust fan can also be regarded as ventilation equipment.
However, with the changes of fresh air technology and modern living environment, from one-way flow to two-way flow, from ventilation demand to filtration and purification demand, the pattern of modern fresh air has gradually formed. This fresh air distribution equipment, that is, the air distribution static pressure box.
The main functions of the plenum are as follows:
1. As the name implies, the "static pressure box" can convert part of the dynamic pressure flowing into the cavity into static pressure (the static pressure determines how far the wind energy in the pipeline blows), so as to ensure that the air output at the end tuyere reaches the expected effect.
2. Distribute the air volume sent by the main engine evenly to all rooms through the air distribution static box to avoid noise caused by excessive air volume in some rooms and ineffective air volume in some rooms.
3. When the wind from the fresh air main machine passes through the air distribution box, the wind speed will slow down and the sound generated by the wind speed will also decrease. And the air distribution static pressure box is lined with a layer of sound absorption material, which can reduce the noise generated by the fresh air system by 5- 10 dB.
Third, fresh air (pipeline)
Is the fresh air duct simple enough? Is it completed by pulling a few pipes from the fresh air main engine to each room? No, there is actually more knowledge here.
Decorated owners will have a certain understanding of the materials of the above two kinds of pipes. PPR is the water supply pipeline for domestic water. Because it involves the drinking water source, PPR material itself has the foundation of sanitation and environmental protection.
PVC materials are very common in decoration, such as PVC pipes, boxes, cup combs, cables and so on. However, PVC materials are not environmentally friendly, and hydrogen chloride gas will be released during the aging and decomposition of materials, which will endanger human health in serious cases. Therefore, PVC products are generally used in places where contact with each other is not close.
Now, if you want to exchange places where PVC and PPR are used, will you?
I think most people don't want to use PVC pipes as drinking pipes at home, which is a joke about family health. But why do people leave PVC alone in the fresh air pipeline to transport clean air?
Above: Installation of fresh air system in PVC pipeline
Let's not talk about the installation process of fresh air here. From the material itself, environmental protection should be the most basic requirement of ventilation pipes.
The fresh air system should have provided indoor fresh air, because the pipeline problem polluted the transported air. Isn't this a great loss?
However, in the current fresh air market, it is very common for PVC drainage pipes to be used as fresh air ventilation pipes. Most fresh air users don't know that there is another kind of environmental protection ventilation duct-HDPE double-wall corrugated pipe.
HDPE double-wall corrugated pipe not only has the advantages of installation and noise reduction, but also has high environmental protection in raw materials (PE). PE raw material itself only has the atomic structure of c and h, which is colorless, odorless and nontoxic.
PE materials are used very closely in daily life, such as PE cling film for fruits and vegetables, food packaging, heating pipes and so on. From the point of view of environmental protection, DHPE pipe is a kind of ventilation pipe which is very suitable for fresh air system.
There is nothing wrong with PVC as a water supply and drainage pipeline, but the characteristics of the material determine its applicability and limitations. Oranges are born in Huainan and oranges are born in Huaibei. There can't be a cure-all tube.
If you really want to install an "effective and environmentally friendly" fresh air system, please pay attention to these three parts when purchasing. Otherwise, if you install a fresh air system, the effect may not be as good as the exhaust fan in the bathroom.
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