Fresh air system as an indispensable element of passive house

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Passive houses are generally composed of several systems such as high-efficiency heat preservation system, passive energy-saving door and window system, intelligent shading system, high-efficiency fresh air system, and good air tightness. Relying on advanced energy-saving design and construction technology, Passive Houses can realize a livable indoor environment with constant temperature and oxygen through renewable energy such as solar energy and geothermal energy.

As an indispensable element of a passive house, the fresh air system plays a key role in it?

The fresh air system is an independent air treatment system composed of a supply air system and an exhaust air system. It is divided into a ducted fresh air system and a ductless fresh air system. The ducted fresh air system is composed of fresh air blowers and pipe fittings. The fresh air purifies the outdoor air into the room and exhausts the indoor air through ducts. The ductless fresh air system consists of fresh air blowers, and the fresh air purifies outdoor air into the room. Relatively speaking, the ducted fresh air system is more suitable for industrial or large-area office areas due to the large amount of work, while the ductless fresh air system is more suitable for home use because of its easy installation. In 1935, Auston Chunyi invented and manufactured the world’s first heat exchange equipment that can filter air pollution after many attempts, also known as a fresh air system.

The core function of a passive house is to maximize the use of energy, and the efficient heat recovery technology of the fresh air system is in line with the above characteristics. The fresh air system equipped with heat exchange core can reduce the energy loss in the process of outdoor fresh air and indoor exhaust. At the same time, it uses the cold (heat) energy generated by the air conditioner to reduce room temperature fluctuation and reduce the difference between indoor and outdoor temperature. The characteristics of heat and high air tightness meet people’s heating and cooling needs.

The peripheral structure of the passive house has strong airtightness, similar to a sealed thermos, but if ventilation measures are not taken, it is really not livable, and the fresh air system solves this problem well. The high-efficiency fresh air system in the passive house can circulate indoor and outdoor air for 24 hours, using high-efficiency filters to filter out dust, particles, bacteria and other harmful substances in the air. At the same time, the fresh air system has low power consumption (the power consumption is much less than that of ordinary households. Electrical appliances), low noise and other features can ensure a good indoor air environment.

Vtronic, as a high-tech enterprise focusing on low-power motors and commercial/domestic fresh air systems, examines its products with the highest quality and provides fresh and clean indoor air for many families.

Passive house schematic diagram: the combination of efficient building envelope and fresh air system

The building shows the outdoor air intake pipe of the fresh air system through soil pretreatment, instead of directly bringing outdoor cold or hot air into the room, the underground pipe fresh air system is used in passive houses.

Floor heating coils are also installed in the ground floor to ensure the indoor temperature in winter.


In this energy-saving house, in addition to the fresh air system, there is also a solar water heating system.


The schematic diagram of the fresh air system, the indoor waste air is discharged into the fresh air blower at about 20 degrees, exchanges heat with the fresh air and then discharged to the outdoors. The new air is heated from the original low temperature to 18 degrees after this round of heat treatment.


The red arrow is the return wind, the blue arrow is the fresh wind


In this kind of sloping roof villa building, the fresh air equipment is often installed in the attic, which does not occupy the height of the indoor space, which is very suitable


Fresh air pipes often use round pipes with good results


The fresh air system is a standard product for people with health needs


The principle diagram of the passive house fresh air system


Diagram of the principle of the passive house fresh air system, the principle of fresh air heat exchange.