Solar Drying
Function principle
FAQ Usage of thermal energy

Function principle of solar drying

Principle of solar drying

The natural solar radiation is used for the evaporation of water in the solar drying plants. To protect the sewage sludge from the rain the drying area is covered with a transparent cladding.


Lateral the building area is bounded by guide tracks. These function as running surface for the SolarTiger® and as foundation of the cladding.


The natural solar radiation impinges on the sewage sludge. The sludge warms up and the contained water evaporates. (The reason is a natural pressure equalisation between vapour pressure in the sewage sludge and the partial pressure of water in the air.)


On the surface of the sludge a high relative humidity arises quickly. To transport this moist outside the hall air ventilators produce artificial wind on the surface of the sludge.


In the case of equal temperature moist air is lighter than dry air. The air exchange takes place through flaps in the roof.


With the SplarTiger® technology the sewage sludge is turned and aerated uniformly over the enitre width of the hall. The sludge can also be transported in the longitudinal direction of the hall.


With the SolarTiger® technology only 20 – 25 kWh electrical energy per 1,000 l evaporated water are required