The third demonstration site will be placed in the ceramic industry for brick drying. The useful supply temperature of the novel heat pump system will be around 90 to 160 °C; the heating capacity between 600 to 1000 kW.
The shaped clay products (green bricks) with a moisture content of around 30 % must be dried to a maximum allowed kiln-entrance-moisture of 2-4 %. The drying takes place in “open” convection dryers by use of hot air. “Open” refers to the fact, that warm/hot air enters the dryer, whereas tepid/cold air with high relative humidity exits the dryer. The heat-pump is foreseen to recover sensible and latent energy from the humid air flow to supply heating coils in the dryer with hot water. The whole process can be “closed”. Beside the considerable reduction of CO2-emissions, the condensed water can be re-used in the production process.