What the Tech: Venti­lation systems for air exchange according to demand

Air exchange is espe­cially impor­tant in reno­vated houses and new build­ings, as they are almost airtight. As a result, they hardly lose expen­sive heat energy, which is good for the envi­ron­ment, but there is also hardly any air exchange. Mold can be the result.

To avoid this and still not have to venti­late and thus lose energy, venti­lation systems help. Venti­lation systems work with heat exchangers. There are two types of venti­lation systems: central­ized and decen­tral­ized. Decen­tral­ized systems can be easily retro­fitted in the case of energy-effi­cient reno­va­tions. In new build­ings, a central venti­lation system usually supplies all the rooms to be venti­lated via a branched pipe system.

The room utiliza­tion plays a deci­sive role here. A distinc­tion is made between supply and exhaust air rooms. While a living room, for example, is a typical supply air room, the bath­room, on the other hand, is an exhaust air room from which the moist air is removed. In this way, the thermal energy is retained in the house. Whether the venti­lation system is central­ized or decen­tral­ized, the systems must have high energy effi­ciency, as they perma­nently supply us with fresh air. Reversible fans can supply us with fresh air or remove the exhaust air at short inter­vals.

At the same time, the venti­lation system keeps pollen and other parti­cles out of the house. Venti­lation systems can save up to 50 percent of heat energy, which can be used for other nice things in the house.