Thermal Storage for Waste Heat Recovery is on the Rise
About 25 % of the final energy demand in Germany is accounted for by process heat and cooling. One key to improving energy efficiency here is the use of waste heat, which can be significantly improved by thermal storage.
"In the temperature range of over 140 °C, around 12 % of the industrial final energy requirement could be saved by using waste heat, in the range between 60–140 °C still 6 %. In absolute figures, these are enormous amounts of energy. In addition, industrial waste heat can also be used to heat houses. Here we even come up with a potential of 45 % of Germany's heating energy demand, which corresponds to a possible saving of 55 million tons of CO2 per year," stated Dr Andreas Hauer of the Bavarian Center for Applied Energy Research (ZAE). In his presentation at the Energy Storage Expo Forum in March 2019, Dr Hauer explained thermal storage solutions that are already being used successfully in industry. These include a technology that reduces waste heat losses during the cleaning and drying of metal components by more than 50 %. The savings are made possible by combining a hot water cylinder heated with exhaust air with a heat pump that can recover almost all the heat from the exhaust air.