What is the fresh air system? What is the fresh air system fan?

In recent years, with the aggravation of urban environmental pollution, people pay more and more attention to the degree of air pollution, and the requirements for air quality are gradually improving. How to breathe the clean air of nature in the seriously polluted urban environment has become a long-term problem. The emergence of fresh air system helps people solve this problem. Maybe you are not familiar with the fresh air system, so today I will tell you what the fresh air system is and the cost of your fresh air system. I hope that after reading the introduction of the fresh air system, you will have a clear understanding of the fresh air system.

What is the fresh air system? We can learn more about it from the following aspects.

1、 Operating principle of fresh air system

The principle is that fresh air is supplied to the room with special equipment on one side of the closed room, and then discharged from the other side with special equipment. The implementation scheme is as follows: the centrifugal fan is driven by a high voltage head, large flow, low power DC high-speed brushless motor, the air is supplied to the room from one side through mechanical strength, and the air is distributed outside a specially designed fresh air exhaust fan from the other side to force the creation of a new air flow field in the system. At the same time of air supply, fresh air shall be used to filter, disinfect, sterilize, oxygenate and preheat the air entering the room (in winter). When the exhaust gas passes through the host, it will exchange with fresh air to recover heat, and most of the recovered energy will be sent back to the room through fresh air. A scheme to create a large clean space is used to ensure that the air entering the room is clean. Achieve the goal of indoor air purification environment.

2、 Main advantages of fresh air system

1) You can enjoy the fresh air of nature without opening the window;

2) Avoid "air conditioning disease";

3) Avoid moldy indoor furniture and clothes;

4) Remove harmful gases that are released slowly for a long time after interior decoration, which is beneficial to human health;

5) Adjust indoor humidity to save heating cost;

6) Effectively eliminate various indoor bacteria and viruses;

7) Super mute.

3、 Main functions of fresh air system

First, use outdoor fresh air to renew indoor air polluted by living and living processes, so as to maintain the cleanliness of indoor air to a low standard.

The second function is to increase internal heat dissipation and prevent discomfort caused by moist skin. Such ventilation can be called thermal comfort ventilation.

The third function is to cool the building components when the indoor temperature is higher than the outdoor temperature. This kind of ventilation is called building cooling ventilation.

4、 Basic type of fresh air system 

1. One way fresh air system

Based on the three principles of mechanical ventilation system, one-way flow system is a diversified ventilation system formed by the combination of central mechanical exhaust and natural air intake. The utility model is composed of a fan, an air inlet, an air outlet, and various pipes and fittings. Ceiling mounted fans are connected to a series of air vents through ducts. The fan starts, and the indoor turbid air is discharged from the room through the fan installed at the indoor air inlet. Several effective vacuum areas are formed in the room. The indoor air continuously flows into the vacuum area and is discharged from the room. Outdoor fresh air is continuously replenished to the room through the air inlet installed above the window frame (between the window frame and the wall), so you can always breathe high-quality fresh air. The air supply system of the fresh air system does not need to be connected with the intake pipe, while the exhaust pipe is usually installed in the corridor, toilet and other places where there is usually a ceiling. In principle, it does not occupy additional space.

2. Two way flow fresh air system

The two-way fresh air system is a central mechanical air supply and exhaust system based on the three principles of mechanical ventilation system, which is an effective supplement to the one-way fresh air system. In the design of two-way flow system, the position of exhaust host and internal exhaust port is basically the same as that of one-way flow distribution, but the difference is that fresh air in two-way flow system is supplied by fresh air host. The fresh air host is connected to the indoor air distributor through pipes. The fresh air host continuously sends fresh outdoor air into the room through pipes to meet people's daily demand for fresh and high-quality air. The exhaust port and fresh air outlet are equipped with air volume control valve, which can realize internal ventilation through power exhaust and host drive.

3. Total heat exchange fresh air system

The fresh air heat exchange system is an improved air supply and exhaust system with heat recovery function based on the two-way fresh air system. Its working principle is the same as that of two-way flow, but the difference is that the supply and exhaust air is supplemented by a host, and a heat exchange module is added inside the host, which can quickly absorb and release heat to ensure full heat exchange with the air. The air discharged from the outdoor and the fresh air sent to the indoor are heat exchanged in this general heat exchange device, so as to recover the refrigeration and heat capacity, save the energy of air conditioning and minimize the impact on the indoor temperature on the basis of improving the indoor air quality.

4. Ground air supply system

Because carbon dioxide is heavier than air, it has a lower oxygen content when it is near the ground. From the perspective of energy conservation, the ground installation of fresh air system will achieve better ventilation effect. The cold air from the air inlet at the bottom of the floor or wall or the upper air inlet is dispersed on the floor surface, forming an organized air flow organization; A floating wake is formed around the heat source to dissipate heat. As the wind speed is low, the air turbulence is small, and there is no large eddy current, the air temperature in the internal working area is relatively consistent in the horizontal direction, while in the vertical direction, the higher the layer height, the more obvious this phenomenon is. The upward elevation generated by the heat source can not only eliminate the heat load, but also bring the dirty air from the work area to the upper part of the room and discharge it through the exhaust port at the top. The fresh air, waste heat and pollution from the bottom ventilation move upward under the drive of buoyancy and airflow organization, so that the ground fresh air supply system can ensure good air quality in the indoor working area.

Although the supply of natural air has some advantages, it also has certain conditions for use. It is generally applicable to places related to pollution sources and heat sources, and the floor height is not less than 2.5m. At this time, the dirty air is easy to be removed through the floating wake; The design cooling load of a room also has an upper limit. The current research shows that if there is enough space to place large diffusers, the room cooling load can reach 120w/m2. If the room cooling load is too large, the energy consumption of sliding ventilation will increase significantly, and the economy will decline; In addition, the contradiction between the occupation of land and the occupation of outdoor air supply unit space is more obvious.

It is worth noting that the selected fresh air system will be different according to the different installation environment of the fresh air system. Only by choosing a suitable fresh air system for your home can you achieve a good ventilation effect.

5、 Basic classification of fresh air system

Classification according to ventilation power: natural ventilation, mechanical ventilation;

Classified according to the location of power: centralized power and distributed power.

6、 Main application of fresh air system

Scope of application of fresh air system: If someone is in the fresh air system for a long time and the room ventilation is not smooth, the fresh air system must be used. To sum up, the household fresh air system (using vacuum ventilation) is suitable for places with small space, such as apartments, villas and baby rooms with less air changes; In KTV and Internet cafes, computer rooms, hotels, shopping malls, factories, office buildings, restaurants, banks, classrooms, kindergartens, hospital wards and other entertainment places, as well as places where people have more activities and air changes, try to use fresh air units. It is necessary to use the fresh air heat recovery system because of the large air exchange rate and energy loss.

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