New choices outside the air purifier? Take you to know the fresh air system

Air purifiers are not too small. It is a cost-effective tool to remove particulate matter and gaseous pollutants such as PM2.5, PM10, formaldehyde, etc. In today's air quality, the demand for air purifiers is also growing. .

However, readers who have some knowledge of air purifiers may have heard of another device that also brings fresh air to the home: the fresh air system. What is the fresh air system? Let's discuss it together.

The fresh air system was first developed in Europe and the United States, and it is very popular both in business and in home. However, China's home fresh air system is still rare in the early years, and some people will confuse the fresh air system with the central air conditioning equipment.

The fresh air system is simply a ventilation system. The initial function is to pump fresh air from the room into the room and then discharge the turbid air from the room.

Although it sounds similar to window opening, the advantage of the fresh air system is that it can be equipped with a filtering and thermostatic system, which is much more controllable and comfortable than opening the window, and is very friendly to people who are allergic to dust and other high-level households such as pollen. .

The reason why the fresh air system has received the attention of domestic household users is related to the increasingly serious situation of air pollution in recent years. The fresh air system with filter system can not only undertake the task of ventilation and ventilation, but also reduce the indoor PM2.5 content.

Classification of fresh air systems

According to the air exchange method, the fresh air system on the market mainly includes two types of positive pressure single air inlet fresh air system and exchange type double air fresh air system; according to product form classification, there are ceiling type, wall hanging type and cabinet type three. Kind.

Positive pressure & exchange

Positive pressure type: The principle of positive pressure single air inlet fresh air system is to use the ventilation fan to draw outdoor air into the room, so that the indoor air density is greater than the outdoor, and then the air is discharged from the various gaps and openings existing in the house through the internal and external pressure difference.

Positive pressure single inlet air fresh air system that is only responsible for air intake

The positive pressure single-inlet fresh air system uses a sensible heat exchange system in terms of constant temperature. This exchange system can only solve the problem of constant temperature, and it is completely flawless for humidity regulation, so it is not a mainstream fresh air system solution.

Switching type: The principle of the exchanged two-way fresh air system is to use the ventilation fan to draw the outdoor air into the room, and then to extract the indoor air through the exhaust fan (the same fan can also be used to complete the air circulation).

Switched two-way fresh air system (blue line for fresh air and red line for exhaust)

The exchanged two-way fresh air system uses a better-performing full-heat exchange system for constant temperature, which can simultaneously absorb or release heat and water vapor in the air to exchange heat and moisture.

Therefore, the exchanged two-way fresh air system is more excellent in use. When it is ventilated in winter and summer, there is no need to worry about the outdoor cold/hot, dry/wet air will cause the indoor temperature and humidity to change too much. Positive pressure is a more comfortable solution.

Ceiling, wall-mounted & cabinet

Ceiling type: The ceiling type fresh air system is the whole house fresh air system solution. The advantage is that it can be connected to the whole house (the general kitchen and bathroom are not considered), and the whole house is ventilated, and the effect is also the best. The disadvantage is that the cost is high, and it is necessary to prepare for installation before the renovation, and it will occupy a floor height of about 30cm, which is not suitable for families who plan to add a fresh air system later.

Wall-mounted and cabinet-type: Wall-mounted and cabinet-type fresh air systems are all local ventilation devices. The former is wall-mounted, and the latter is similar to cabinet air conditioners, requiring pipes to lead to the interior. Their point is that they don't have to go through the whole house, and the cost is low, but the disadvantage is that they can only be partially ventilated, which is a measure to replenish the fresh air system.

Therefore, if conditions permit, the best experience is the ceiling-exchange dual-channel fresh air system equipped with a full-heat exchange system.

Filtering method for fresh air system

There are two main ways in which the fresh air system intercepts particulate matter. The first one is the same as the air purifier, which uses a HEPA filter to filter particulate matter in the outdoor air (PM2.5, etc.), and the second is electrostatic dust collection.

We focus on the filtering method of electrostatic dust collection. The principle of electrostatic dust collection is to use a high-voltage electric field to ionize the flue gas, and the dust charge in the gas stream is separated from the gas flow by the electric field. Compared to the use of HEPA filters, electrostatic dust collection does not require the consumption of consumables, only the cleaning of the dust box is required.

However, due to the certain amount of ozone generated during the work process, and excessive ozone is harmful to the human body, the fresh air system does not use electrostatic dust collection as the main filtering means, and the domestic fresh air system uses the HEPA filter, or both.

Integrated mesh with electrostatic dust collection and HEPA

Summary: Porters of fresh air

Although there are quite a lot of doorways for the fresh air system, there is only one function of the fresh air system, which is to keep the indoor air fresh. For areas with severe outdoor air pollution, the fresh air system allows family members to breathe fresh air all the time, and the effect is still great. For areas with better outdoor air conditions, the fresh air system is a bit overkill.