What is a modular air handling unit


Air handling unit (AHU): The air handling unit (AHU) is a centralized air handling system, which originated from the forced hot air heating and ventilation system where the equipment is centralized and the heated air is distributed through the air duct. The basic centralized system is an all-air single-zone system that generally includes fans, heaters, coolers, and filters. The AHU mentioned here refers to the primary return air system. Its basic working process is: after the fresh air from the outside is mixed with part of the indoor return air, the dust, smoke, black smoke and organic particles in the air are filtered out through the filter. Harmful Substance.

The clean air is sent to the cooler or heater through the fan for cooling or heating to a level that makes people feel comfortable and suitable, and then sent into the room. The air conditioning process changes according to winter and summer seasons, and the conditioning process of a typical centralized air treatment system is also different.

Equipment used to adjust indoor air temperature, humidity and cleanliness. There are air heaters, air coolers, air humidifiers to meet the requirements of heat and moisture treatment, air filters to purify the air, air mixing boxes to adjust the fresh air and return air, and mufflers to reduce the noise of the ventilators. Air handling units are equipped with ventilators. According to the year-round air conditioning requirements, the unit can be equipped with an automatic adjustment system connected to the hot and cold sources.

The fresh air unit mainly processes the status of outdoor fresh air, while the air handling unit mainly processes the status of indoor circulating air. Compared with fan coil plus fresh air systems and unit air conditioners, it has the advantages of large air volume, high air quality, and energy saving. It is especially suitable for systems with large spaces and large flow of people such as shopping malls, exhibition halls, and airports.

A good air handling unit should have the characteristics of taking up less space, having multiple functions, low noise, low energy consumption, beautiful appearance, and easy installation and maintenance. However, due to its many functional sections and complex structure, in order to achieve a comprehensive consideration of one without losing the other, designers and construction units are required to compare materials, manufacturing processes, structural characteristics, and selection calculations in order to obtain a better result. Satisfactory results.

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