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Principle of building system negative pressure
Release time:
2021-04-26
Building system negative pressure exhaust refers to the exhaust fan exhausting air outdoors, creating negative pressure indoors. According to the principle of atmospheric balance, outdoor fresh air directly enters the room through the exterior wall air inlet. In the use of European residential ventilation, the building system negative pressure unidirectional flow system is the mainstream technology on the market. It is a unidirectional flow system with two methods: a separate independent single-host ducted exhaust system and a separate independent modular ductless combined exhaust system.
Building system negative pressureIt poses certain health risks, making residential building ventilation particularly important. Residential ventilation systems are typically divided into two categories:Positive pressure supply air systems and negative pressure exhaust air systems. These are further subdivided into unidirectional flow systems and bidirectional flow systems.
A positive pressure air supply system refers to a system where exhaust fans blow air into the room, pushing indoor waste air out through return air vents. It is divided into two modes: unidirectional flow system and bidirectional flow system.
Bidirectional flow system:A bidirectional flow system is also an air supply system with a heat recovery device. Its principle is that fresh air entering the room from outside and waste air discharged from the room to the outside pass through a heat exchange box, utilizing the heat-conducting material in the heat exchange box to allow the incoming fresh air to absorb as much energy as possible from the discharged waste air, thereby achieving energy efficiency.
Theoretically, this is a good method, but compared toBuilding system negative pressureventilation, it occupies a large amount of indoor space, has high investment costs, complex installation, and high maintenance and operating costs, especially since the heat recovery rate does not have a significant economic advantage compared to the investment cost.
Building system negative pressure exhaust refers to exhaust fans exhausting air outdoors, creating negative pressure indoors. According to the principle of atmospheric equilibrium, outdoor fresh air directly enters the room through the exterior wall air inlets.
In the use of residential ventilation in Europe, the building system negative pressure unidirectional flow system is the mainstream technology on the market. It is a unidirectional flow system with two methods: a stand-alone single-host ducted exhaust system and a stand-alone modular ductless combined exhaust system.
The ducted independent single-host exhaust system consists of a high-volume exhaust fan and multiple air inlets. BecauseBuilding system negative pressurethe exhaust volume is fixed, the exhaust volume of small units will be relatively large, while the exhaust volume of large units will be too small.
The ductless household independent modular combined building system negative pressure exhaust system consists of one or several ventilation modules, each ventilation module consisting of an exhaust fan and2-3air inlets. Small apartments have fewer rooms, and one bathroom and toilet can meet the ventilation requirements, while large apartments have more rooms, multiple bathrooms and toilets, so the number of building system negative pressure ventilation modules used also increases accordingly. Therefore, it is suitable for various high-rise buildings or multi-story houses and villas.
Key words:
Building system negative pressure
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