What happened before ...Around 4 months ago, we started to renovate a house build in the mid 50ies, located in the south of Germany. It was obvious, we have a problem with damp walls in the basement. Several things started to mold... The basement was not insulated and the water connection was not solid any more, we had a small leakage where water was running out very slowly.
The first step to fix this was simple: we exchanged the parts behind the water clock. As a result, the humidity in our basement got lower and the walls and floor started to dry.
But we want to ventilate the basement to get more humidity out of it,
Basic ConceptTwo ventilators, the first to get fresh air into the basement, the second to blow the moist air out of it.
But remember: what happens if warm air hits cold walls? The humidity from the warm air is condensing on the cold walls, and the walls are getting really wet. As this must not happen, you need to take the temperature into account:
- the temperature of the air which comes from outside,
- the cold air which is already inside and
- the temperature of the walls (which may even be cooler...)
The correlation between relative air humidity, temperature and water content of the air (and also the enthalpy) can be described by using the Mollier-h,x-diagram (see Wikipedia, in german language only).
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