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In recent years, due to the increase in smog and air pollution, the market for air purifiers and fresh air systems has been extremely hot, followed by the crazy promotion and sales of major air purifier brands. Among them, there must be many merchants who fish in troubled waters to deceive consumers by selling counterfeit or shoddy air cleaning products.
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Fresh air system
To understand what a true fresh air system is, we must first understand what a false fresh air system is.
False fresh air system, to put it bluntly, is a system that cannot fully introduce outdoor fresh air into the room.
There are two main categories:
The first type is the system where indoor air and outdoor fresh air cannot be exchanged at all, such as air conditioners. Some air conditioners claim to have their own fresh air mode, but they are still domestic circulation. This is the most typical pseudo-fresh air.
First of all, the air conditioner with fresh air uses positive pressure air supply, and after the indoor pressure reaches a certain level, it is higher than the outdoor pressure and the static pressure of the fan, and the wind can no longer enter the room, so it cannot solve the problem of ventilation and ventilation; secondly, these air conditioners with fresh air are prone to a large number of bacteria, especially in winter; thirdly, this air conditioner with fresh air cannot be fully exchanged with the outdoor air, and the price is also higher than that of ordinary air conditioners.
The other type is systems where outdoor fresh air cannot be fully exchanged with indoor air, such as wall-mounted fresh air fans, which can be exchanged, but only a local range can be exchanged, and the exchange is not sufficient.
Then let's talk about the real fresh air system.
The real household fresh air system is classified according to the air supply method and can be divided into two types:
One-way flow fresh air system
The unidirectional flow fresh air system is divided into two categories: one is the negative pressure fresh air system, and the other is the positive pressure fresh air system.
1. Negative pressure fresh air system
The negative pressure fresh air system refers to the continuous discharge of indoor dirty air from the ultra-quiet fan to the outside to form a negative pressure. According to the principle of atmospheric balance, the outdoor fresh air is directly introduced into the room through the wall air inlet or window air inlet, so that the indoor air is fresh and clean.
The fresh air host is installed in the ceiling of the bathroom or kitchen, and the indoor dirty air is sucked into the host through the trend of each row to be strongly discharged outdoors. The negative pressure area is naturally formed in the indoor air, and the negative pressure effect is used to filter the outdoor fresh air through the vent and automatically enter the room., forming an uninterrupted and continuous circulation of exhaust and intake air.
The negative pressure fresh air system is essentially an exhaust fan, which is characterized by no need to install air supply pipes, but the filtering effect of suction trend is very general.
2. Positive pressure fresh air system
The principle of the positive pressure fresh air system is opposite to the negative pressure fresh air system. The whole system only enters the trend, and only installs the fan in the trend to force the air into the house to form a positive pressure. The flow of dirty air is not considered, forcing the dirty air to be discharged from the window seam, door seam, etc.
Two-way flow fresh air system
Different from the one-way flow, the two-way flow of fresh air is sent to the room by the fresh air host through the air supply pipe. There are power and pipes in the inlet trend and exhaust trend, and air supply and exhaust to the room through machinery and pipes. There are also many two-way flow fresh air systems
Types, common ones are:
1. Send row correspondence
That is, a new trend corresponds to a row trend, which can maintain the balance of air volume in each room.
The advantage is that each room can form an independent space, which works best. The disadvantage is that the pipes are complex, and each room requires an extra exhaust duct, which may require holes in the beams, which is more expensive.
2. Send more single-row types
That is, multiple new trends, corresponding to 1-2 row trends, row trends can be located in walkways, bathrooms, balconies and other rooms.
The advantage is that the pipeline is relatively simple, if the air supply is matched, there is almost no need to punch holes in the beam (the new trend is on the ground, the row trend is near the host), and the cost is low; the disadvantage is that the door of each room needs to leave a little gap, otherwise it is difficult to achieve ventilation).
Third, the full heat exchange fresh air system
The problem comes: in winter and summer, if the indoor and outdoor air are exchanged, how should the indoor temperature be guaranteed? Therefore, the application of heat exchangers. Strictly speaking, the full heat exchange fresh air system is a kind of two-way flow fresh air system.
The full heat exchange is just a module, which adds a full heat exchange module on the basis of the two-way flow fresh air system, which can not only maintain ventilation but also save energy as much as possible. For example, in summer, all the indoor cool air will not be discharged to the outside, and all the outdoor hot air will be sucked in; in winter, all the indoor hot air will not be discharged to the outside, and all the outdoor cold air will be sucked in. It is suitable for the situation where the air conditioner can be turned on while the fresh fan can be turned on.
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