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Classified by air supply method
1. One-way flow fresh air system
The unidirectional flow system is a diversified ventilation system formed by the combination of central mechanical exhaust and natural air intake based on the three principles of mechanical ventilation system. It is composed of fans, air inlets, air outlets, and various ducting and joints. The fan installed in the ceiling is connected to a series of exhaust ports through pipes. The fan starts, and the turbid air in the room is discharged through the fan through the suction port installed in the room. Several effective negative pressure zones are formed indoors, and the indoor air continues It continuously flows to the negative pressure area and is discharged to the outside. The outdoor fresh air is continuously replenished indoors by the air inlet installed above the window frame (between the window frame and the wall), so as to breathe high-quality fresh air. The air supply system of the fresh air system does not require the connection of air supply ducts, and the exhaust ducts are generally installed in aisles, toilets and other places that usually have ceilings, and basically do not take up additional space.
2. Two-way flow fresh air system
The two-way flow fresh air system is a central mechanical air supply and exhaust system based on the three principles of mechanical ventilation system, and it is an effective supplement to the one-way flow fresh air system. In the design of the two-way flow system, the positions of the exhaust air host and the indoor air outlet are basically the same as the unidirectional flow distribution. The difference is that the fresh air in the two-way flow system is supplied by the fresh air host. The fresh air main unit is connected to the indoor air distributor through a pipe, and the fresh air main unit continuously sends outdoor fresh air into the room through the pipe to meet people's daily needs of fresh and quality air. Both the exhaust vent and the fresh air vent are equipped with air volume control valves, and the indoor ventilation is realized through the power exhaust and delivery of the host.
3. Ground air supply system
Since carbon dioxide is heavier than air, the closer it is to the ground, the lower the oxygen content. From the perspective of energy saving, installing the fresh air system on the ground will result in better ventilation. The cold air sent from the air outlet or upper air outlet at the bottom of the floor or wall spreads on the floor surface to form an organized air flow; and a buoyant wake is formed around the heat source to take away the heat. Due to the low wind speed, the airflow organization is turbulent smoothly, and there is no large vortex, so the air temperature in the indoor working area is more consistent in the horizontal direction, but stratified in the vertical direction. The higher the layer height, the more obvious this phenomenon. The upward wake flow generated by the heat source can not only take away the heat load, but also bring the dirty air from the working area to the upper part of the room, and discharge it through the exhaust port at the top. The fresh air, waste heat and pollutants sent from the bottom air outlet move upward under the driving force of buoyancy and air flow, so the ground air supply system can provide good air quality in the indoor working area.
Although ground air supply has certain advantages, it also has certain applicable conditions. Generally applicable to places where pollution sources are related to heat sources, and the floor height is not less than 2.5m. At this time, the polluted air is easily taken away by the buoyancy wake; there is also an upper limit for the design cooling load of the room. Research shows that if there is enough If the space comes with a large air distribution device, the cooling load of the room can reach 120w/㎡. If the cooling load of the room is too large, the power consumption of the displacement ventilation will be significantly increased, and the economy will be reduced; in addition, the air supply device occupies land and space. The contradiction is also more prominent.
It can be seen that depending on the installation environment of the fresh air system, the selected fresh air system will be somewhat different. Only by choosing a fresh air system suitable for your home can you achieve the best air exchange effect.
The principle of positive pressure air supply is to directly send air into the room through power. According to experts, this system has no major problems in theory, but its convection is poor.
Another form of negative pressure ventilation is to suck in the air through an exhaust fan to draw out part of the indoor air, causing the indoor air pressure to be less than the outdoor air pressure, and the outside air automatically enters the space under the atmospheric pressure, thereby forming a directional, Stable airflow belt. Its characteristics are mainly that the airflow is oriented, stable, and connected to the outside world instead of internal circulation in the space.
Classified by installation method:
1. Ducting fresh air system: The central ducted fresh air system is connected to the fresh air host through a pipeline. The principle of the system is to install exhaust fans and exhaust ducts in the kitchen and bathroom, and install air inlets in the bedroom and living room. When the exhaust fan is in operation, the original indoor air is discharged, so that the indoor air generates negative pressure. The outdoor fresh air enters the room through the air inlet under the action of the indoor and outdoor air pressure difference, so as to achieve the purpose of indoor ventilation.
2. Single fresh air system: The single fresh air system is a fresh air system product newly launched in recent years, which includes two products: wall-mounted fresh air system and floor-standing fresh air system. The main structure is not much different from the central fresh air system. The difference is that the single fresh air system does not require complicated piping works, and the installation method is very simple. It can be installed before and after decoration, and the maintenance cost in the later period is also very low.
Classified by ventilation power: natural ventilation, mechanical ventilation;
According to the scope of ventilation service: full ventilation, partial ventilation;
Classified according to the direction of air flow: sending (in), exhaust (smoke);
Classification according to the purpose of ventilation: general ventilation, hot air heating, detoxification and dust removal, accident ventilation, protective ventilation, building smoke prevention and exhaust, etc.;
According to the location of power: centralized power and distributed power;
Classified by style: vertical cabinet (floor type), cabinet type, wall-mounted type, ceiling type.
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