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What are the functions of a building's negative pressure system?
Release time:
2021-05-11
Building system negative pressure system is a "forced exhaust, natural inflow" ventilation system, which only installs a central fan in the exhaust system, using the negative pressure principle to drive indoor air flow. Fresh air enters the living space, and dirty air is discharged from the bathroom.
Building system negative pressure system is a“Forced exhaust, natural inflow” ventilation system. It only installs a central fan in the exhaust system, using the negative pressure principle to drive indoor air flow. Fresh air enters the living space, and polluted air is discharged from the bathroom. So why is the building system negative pressure system more suitable for residential use? Building system negative pressure systems are more suitable for residential areas, small offices, hospital wards, hotel rooms, etc., for the following reasons:
1The building system negative pressure system only has pipes installed in the bathroom, occupying less space and not requiring the ceiling to be indoors. The heat recovery ventilation system supplies air through pipes and requires the ceiling to cover the pipes indoors. Generally, the height of residential buildings is within three meters, and the ceiling will occupy indoor space, making the room feel depressing.
2The building system negative pressure system does not require long pipes to deliver fresh air. The air intake does not need pipe connections; fresh air directly enters the room and can be cleaned and maintained independently. Replacing the filter pads is more convenient; you don't need to spend money to find professionals for repairs. The supply air pipes of the heat recovery ventilation system are long and narrow and cannot be cleaned. Over time, thick dust will form on the pipe walls. It is inconvenient to open the inspection port on the ceiling when replacing the filter screen. When cold and hot air meet in the heat recovery device, condensation will occur, easily producing mold.
3For areas with relatively small space and less personnel flow, the required fresh air volume is small, and the energy loss during ventilation is negligible. Spending several times more than the building system negative pressure system to recover this negligible energy is obviously not cost-effective. In addition, the heat recovery ventilation system requires both supply and exhaust fans to operate, which is more expensive than the building system negative pressure system, which only needs one fan to complete ventilation, making it less energy-efficient.
4In the tubular heat exchange ventilation system, fresh air enters from the air intake, is processed by the fresh air unit, and then sent into the room through the air duct. During this process, it may be polluted. Some scholars have proposed the concept of “fresh air quality entering the room,” which is related to the age of the fresh air entering the room.(That is, the transportation time from the outdoor air intake to the indoor air outlet.)The shorter the time it takes for fresh air to enter the room, the less pollution it causes, and the better the quality of the fresh air. The air intake of the building system negative pressure system has no pipe connection, and the fresh air directly enters the room. The time it takes for fresh air to enter the room from the air intake is the shortest; therefore, the fresh air quality is superior to the heat recovery ventilation system supplied by long and narrow pipes.
The building system negative pressure system can continuously provide fresh air for the indoor environment, which is beneficial for children's healthy growth and adult health. In this way, we can enjoy fresh air in the house without opening windows. In addition, the building system negative pressure system also has a filtration function, reducing bacterial infection.
Key words:
Building system negative pressure
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