Workgroup Solar collectors

Dr. Federico Giovannetti
Tel.: +49 (0)5151-999 501

Stagnation tests on systems with heat pipes
(left: Prototype system, right: Reference system)

Solar active glass panel

Our working group carries out research and development on solar thermal collectors and on the collector loop. The focus is on cost reduction in the system, increased operational safety and integration into the building envelope. Furthermore, we target new application areas such as combined heat and power supply, solar assisted district heating and industrial process heating. We do both theoretical and experimental work and consider the two essential aspects performance and reliability of collectors.

Stagnation safe solar thermal systems

The stagnation behavior of solar systems is of crucial importance for their long-term reliability and economic viability. The evaporation of the collector heat carrier can damage temperature-sensitive components of the collector circuit and cause additional costs. The group has a long experience with the analysis of the stagnation state as well as the development of strategies for minimizing risk. Within current projects we are developing new collectors which promise a significant reduction in the temperatures in the solar circuit and a steam-free operation of the plants. Two different concepts are pursued and investigated: the control of two-phase heat transport in heat pipes and the use of solar absorbers with temperature-dependent optical properties (thermochromic layers).

Solar active building envelopes

The integration of collectors into the building envelope enables architecturally attractive solutions as well as cost savings through synergy effects. Thus, it represents an important prerequisite for a higher acceptance and a successful dissemination of solar thermal systems in building practice. The solar activation of the building envelope requires a more holistic design approach: In addition to questions of system performance and reliability, also aspects related to building physics, thermal comfort and aesthetics have to be taken into consideration. In cooperation with manufacturers and architects we develop specific solutions for the façades and roofs of residential and non-residential buildings.

New application areas

Beside decentralized space and domestic hot water heating, solar assisted district heating and industrial process heating also offer a significant potential for saving fossil fuels and reducing greenhouse gas emissions. Higher application temperatures, larger fields and very different load profiles require customized solutions for components and systems. The group deals with the development and testing of new concepts such as highly efficient flat collectors as well as with the analysis and optimization of the hydraulic behavior of collector fields. Another main research area is the combined heat and power supply with photovoltaic-thermal collectors. In close cooperation with other working groups of the departments Solar Systems and Photovoltaics, we focus on the development of uncovered modules for efficient integration in heat pump-based energy supply systems.

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