Solar heating dehumidifies and ventilates the basement


Homeowners who purchase a SolarVenti solar air collector for their basement, do it usually because the indoor climate of the basement is experiencing greater cold, damp more humid and musty than the rest of the home.

The air is typically too static and both humidity and moisture content in walls and other building structure is too high.

When the SolarVenti solar air collector is mounted, the basement’s indoor air quality will significantly be improved within a few weeks to months and the homeowner will begin to experience the basement air as much fresher and less humid to breathe. If the structures are concrete, brick or stone -high thermal absorbency, then that room will also hold the supplementary heat for longer comfort levels.

In Australia nearly all year round, and every time the sun shines the least bit, the solar air collector will blow free, warm and dry air into the basement. Creating positive air pressure, the air pushes the tucked away, moist air out through the basement vents.

After a full season with a solar air collector of the right size, both indoor air and the moisture level in the basement’s solid materials – walls, other building structure furniture etc. – have fallen significantly. With that structures and air will be at a more ‘comfortable’ level.

A dry and fresh basement with SolarVenti

SolarVenti solar air collector uses solar energy and air via the fan units to dehumidify the basement. Through a combination of heating (blowing hot air) and positive ventilation (intake and extraction of moist air) pulls the content moisture out of the masonry and other materials, then carries the moist air out of the basement. A Ventilation Kit together with the sun collector is highly recommended with the solar air collector chosen.

Dehumidification of the basement
  1. Fresh air is sucked in through the solar air collectors perforated backplate. The air circulates in the collector and is heated by the sun via the special black filter.
  2. With the twin fan system, the sun shines on the panel, then supply fan and exhaust system start working.
  3. SolarVenti blows about 100-200 m³ fresh and dry air into the basement of an hour. The preheated air injected can be about 15-40° C warmer than the outside temperature.
  4. The exhaust fan removes the damp and stale air by sucking it out of the basement – in this way you avoid the clammy air flowing up into the rest of the house.

Example of the drying process

Phase I: Ventilation / Air exchange

When a basement is to be dehumidified with a solar air collector or solar air heater, consistent air exchange is extremely necessary.

The moisture that often hangs in the air causing the familiar musty basement odor, must be replaced with nice, fresh air. Solar air collectors from SolarVenti are known for their large air volume and therefore particularly suitable for dehumidification of basements or similar cellar areas.

Phase II: Heating + Ventilation

After the first hour of operation heating is increasingly important. The high air supply temperatures will now lead to an evaporation from building materials, structure and furniture.

A high air exchange is still required and ensures that the evaporated moisture is carried out of the building. It is extremely important to dimension the size of the exhaust ventilator (Ventilation Kit) to the solar air collectors -air supply capacity.

With an undersized exhaust ventilator you run the risk that moisture condenses before getting out of the basement. An air change rate of once per hour is recommended.


Dehumidification continues…

While the collector is quiet at night, the dehumidification process continues through thermal balance and equilibrium moisture content (EMC) . The dry basement air will now absorb the moisture from the walls and furniture. When dehumidifying begins again after sunrise when the solar air collector runs, the ventilating ‘Phase I‘ is initiated again.