While mashing the temperature of the mash is continuously increased from a starting temperature of around 58°C
to a final temperature of around 78°. If there is solar thermal energy at the right temperature available the energy is
taken out from the solar energy storage tank and pumped to the retrofitted plate heat exchangers. The return flow
from the process back to the storage is stratified according to the temperature. If the temperature in the solar energy
storage is not high enough but at least some °C higher than the process return temperature the process supply
temperature needed is heated up in-line via the waste heat from the biomass CHP plant. In case the temperature in
the energy storage tank is lower than the process return flow temperature the storage is bypassed and the mash tuns
are fed by waste heat only. In case both systems cannot supply either the temperature or the energy quantity needed
the existing steam supply system acts as backup in parallel.