Laboratory of Sorption Processes

R&D Projcts

Schema Project QUARREE100
Schema Project QUARREE100

Goal of the project QUARREE100, which is funded by both German Federal Ministries (BMWi & BMBF), is the development and the integration of renewable energy technologies in a flexible and sustainable energy system for the integration in quarters aiming at achieving a renewable share of 100% in providing electricity, heating and domestic hot water demands. The Rüsdorfer Kamp in the German region Heide (State of Schleswig-Holstein) with 20000 inhabitants serves here as a case study and a real laboratory. To this aim, both centralised and decentralised regenerative energy sources will be analysed. The plan is that these resources shall relieve the public electricity grid through an intelligent regulation and sector coupling.

  • Project term: 10/2017 – 05/2022
  • Project value: 1.44 Mil. € (for OTHR), total project value: 24.29 Mil. €
  • Project partners: a total of 23 (universities, research institutes, companies, community amenities)

OTH Regensburg is involved in this project with various tasks. First, a novel thermochemical energy storage system based on a hydrogen-iron process is to be developed. The function of this storage is to store the surplus of wind electricity during off-peak periods and to supply the quarter with electricity and heat during the peak periods. As a long-term goal, the energy storage system should be further developed for application in the field of heavy transport.

Excess electricity shall be used by an electrolyser to split water into oxygen and hydrogen, where oxygen is to be stored in a tank and the hydrogen is to be stored in the hydrogen-iron-redox-storage reactor. During the discharging phase, water shall flow into the reactor to oxidise the iron grains into iron oxide, which results in evolving hydrogen again. A combustion process for burning the resulting mixture of H2/H2O with the stored oxygen in an engine will follow. The engine shall be developed by modifying a Diesel engine. In addition, a simulation model for the complete charging and discharging phases shall be setup. The LSP has the main task to fundamentally develop and investigate the iron-redox storage. This includes for example the experimental and theoretical investigations of the kinetics of both reactions. In addition, a simulation model shall be developed for both scaling up and the integration of the redox-storage in different energy systems.

Further information about this project may be found on the website (link).


In the EU-HORIZON-2020 funded SWS-Heating project a novel heating system based on a multi-modular sorption seasonal thermal energy storage (STES) will be developed. This will allow to store and shift the harvested solar energy available abundantly during summer to winter thus covering a large fraction (>60%) of heating and domestic hot water demand. For this purpose a novel “Selective-Water-Sorbent” (SWS) material will be nano-tailored, tested and optimized. It consists of a hygroscopic salt embedded in a host matrix to remarkably enhance its adsorption, and consequently, storage capacity.

  • Project term: 06/2018 – 05/2022
  • Project value: 500 000 € (for OTHR), total value: 5 Mil. €
  • Project partners: a total of 16 (universities, research institutes, companies)

The principle of the energy storage is the following: In summer solar energy is converted to heat by high efficiency evacuated tube solar thermal collectors. With the help of this heat, water shall be desorbed out of the SWS-sorbent. Thereby the heat storage is charged, making it possible to store the heat for several months and bridge the summer-winter period. In the colder and less sunny winter, the heat storage is discharged, which means that the water shall be adsorbed again, which results in evolving the so-called “heat of adsorption”. This heat is preferably used to cover a high fraction of heating and hot water demand in buildings. A backup heater will only operate when all stored heat has been fully discharged to cover the peak heat demand. The targeted benefit of this next generation solar heating technology is to reach and overcome a solar fraction of 60% in central/north Europe and a solar fraction of 80% in south Europe. Furthermore, for experimental investigations a building prototype will be commissioned including the SWS-heating system. It will be demonstrated and tested in Germany and Sweden.

Further information about this project may be found on the official homepage.


Schema SWS-Heating (source:
Schema SWS-Heating (source: