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Artificial thermal bridge with a dew point switch to accomplish an appropriate control of the ventilation for the prevention of mould growth in buildings

: Krus, M.; Sedlbauer, K.; Sinnesbichler, H.

Yang, X. ; International Society of Indoor Air Quality and Climate -ISIAQ-, Ottawa:
Indoor Air 2005. Proceedings of the 10th International Conference on Indoor Air Quality and Climate : September 4-9, 2005 Beijing, China
Beijing: Tsinghua University Press, 2005
ISBN: 7-89494-830-6 (CD-ROM)
International Conference on Indoor Air Quality and Climate <10, 2005, Beijing>
Conference Paper
Fraunhofer IBP ()

The well known problem of global warming due to the green house effect has provoked the Kyoto Protocol, which calls for a reduction of the CO2-emission, which first of all means energy saving. In colder regions the highest amount of energy is consumed by the heating of buildings. Beside a better insulation the diminishment of ventilation losses is a common way for saving energy. Unfortunately this increases the risk of mould growth. This mould growth is determined by the temperature and relative humidity of the inner wall surface. Because people have no feeling for inside rel. humidity, an appropriate ventilation system has to prevent surface conditions suited for mould. For energy saving purposes a permanent ventilation is no acceptable solution. Instead the ventilation has to take place subjected to unsteady humidification processes like cooking or bathing. The measurement of the surface temperature and humidity to control the ventilation is too expensive and needs continuous maintenance of the sensing elements. Instead the proposed innovative control system uses a thermal bridge, which is designed in such a way, that there dew water occurs just at the same time, when in problematic spaces like corners conditions for mould have been reached. The thermal bridge is equipped with a dew point switch switching the ventilator. Just when the condensation has stopped and the surface of this dew point switch has dried the ventilator will be deactivated. This ensures that the ventilation occurs only when required. Additional advantages are the simplicity and cheapness of this system combined with the lack of necessary service.