Elastomer metal absorber (EMA) solfångare och värmepump
In order to reduce the costs for active solar collectors, a completely new collector type is created, that consists of elastomer fluid tubes clipped in into appropriately shaped metal form sheet elements for the application as metal roofs or façades. Therefore round shaped clip profiles are integrated into typical metal plates for roofing, which have an absorbing layer for the conversion of the solar radiation. The flexible elastomer tubes for the transport of the solar heat have an optimized high thermal conductivity and also good mechanical properties. This new collector, based on this elastomermetal-absorber (EMA) concept, shows inherent freeze resistance while operated with pure water and opens up new simplified installation techniques. For the freeze resistance of the whole solar circuit, including headers and pipes, the drain-back technique is used as hydraulic concept. This new collector, which is completely building integrated, may be designed as uncovered absorber, delivering low temperature heat, or as glazed solar collector for a heat production of up to 80 °C. It can be used in typical solar thermal applications and additionally a wide range of new applications are possible, as the collector can be easily installed and may be operated with corrosive liquids, e.g. seawater or waste water. The creation of the new EMA façade and roof integrated collector included the development of special components:
- Adaption of the elastomer material with regard to the conductivity, mechanical
strenght and durability. Industrial production of appropriate elastomer tubes.
- Development of metal form sheet elements with appropriate designed clip
profiles regarding the thermal performance and the industrial production.
Construction and assessment of different test modules.
- Simulations of swimming pool, domestic hot water and room heating concepts.
- Construction of test systems and development of installation and hydraulic
details. System experience, identification and elimination of weak points.
Steel plates after the forming process.
A reduction of the annual thermal output if compared to standard solar collectors of 10 % and more have to be regarded for uncovered and covered EMA systems, depending on the heat use concept. Cost comparisons showed a cost reduction potential of more than 30 % by the high degree of building integration using metal roofing elements as absorber, while the original function of the roof and façade elements as building envelope is not affected. For the market penetration, the most attractive practical applications are assumed to be swimming pool systems and preheating of water for the unglazed collector and domestic hot water systems for glazed collectors. The system size may vary from small systems in residential buildings up to large systems of more than 1000 m² for swimming pools, sports halls, hotels, hospitals and industrial buildings.
Unglazed steel absorber on a test roof at the test facility at SERC.
Publications
SERC reports
Tepe, Rainer, Rönnelid, Mats. Solfångare och värmepump : Marknadsöversikt och preliminära simuleringsresultat. SERC, Nr. DU-SERC--75--SE, 2002.
Rönnelid, Mats, Tepe, Rainer. Solvärme och värmepump : utvärdering av ett värmesystem i Uppsala. SERC, Nr. DU-SERC--84--SE, Högskolan Dalarna, Borlänge, 2004.
Articles
Tepe, Rainer, Rönnelid, Mats, Perers, Bengt. Swedish solar systems in combinations with heat pumps. ISES World Congress, Gothenburg, June 16-19, 2003.
Kjellsson, E, Hellström, G, Tepe, R, Rönnelid, Mats. Combination of Solar Heat and Ground Source Heat Pump for Small Buildings. Futurestock 2003, Warsaw, September 1-4, 2003.
Tepe, R.. Façade and Roof Integrated Solar Collectors with a Combination of Elastomer Tubes and Metal Form Sheet Elements. System Concepts and Simulation : Final Report EU-Project JOR3-CT98-0236. 2001.
Tepe, R., Bartelsen, B.. Façade and Roof Integrated Solar Collectors with a Combination of Elastomer Tubes and Metal Form Sheet Elements. Absorber and Collector Development and Assessment : Final Report EU-Project JOR3-CT98-0236. 2001.
Tepe, R., Bartelsen, B., Purkarthofer, G., Hierzensberger, K.. Façade and Roof Integrated Solar Collectors with a Combination of Elastomer Tubes and Metal Form Sheet Elements. Assessment of the market viability : Final Report EU-Project JOR3-CT98-0236. 2001.
Tepe, R., Bartelsen, B., Rockendorf, G., Purkarthofer, G.. Façade and Roof Integrated Solar Collectors with a Combination of Elastomer Tubes and Metal Form Sheet Elements. Planning and Construction of Test Systems : Final Report EU-Project JOR3-CT98-0236. 2001.
Tepe, R., Bartelsen, B., Rockendorf, G., Purkarthofer, G.. Façade and Roof Integrated Solar Collectors with a Combination of Elastomer Tubes and Metal Form Sheet Elements. Publishable Final Report : Final Report EU-Project JOR3-CT98-0236. 2001.
Tepe, R., Bartelsen, B., Rockendorf, G., Simetzberger, A, Purkarthofer, G.. Façade and Roof Integrated Solar Collectors with a Combination of Elastomer Tubes and Metal Form Sheet Elements. Operation and Assessment of Test Systems : Final Report EU-Project JOR3-CT98-0236. 2001.
Tepe, R., Lorenz, K., Bartelsen, B., Rockendorf, G.. Façade and Roof Integrated Solar Collectors with a Combination of Elastomer Tubes and Metal Form Sheet Elements. Absorber Form Sheet Production : Final Report EU-Project JOR3-CT98-0236. 2001.
Tepe, R., Bartelsen, B., Rockendorf, G.. Metalldächer als Sonnenkollektoren nach dem Prinzip des Elastomer-Metall-Absorber. Tagungsband Elftes Symposium Thermische Solarenergie, Staffelstein Kloster Banz Germany, 9-11 Maj, 2001.
Tepe, R., Bartelsen, B., Rockendorf, G., Vennemann, N., Purkarthofer, G.. Metalldächer als Sonnenkollektoren. Tagungsband der Architekten- und Ingenieurstagung Soltec 2001, Hameln Germany, 17 Augusti, 2001.
Tepe, R., Bartelsen, B., Rockendorf, G., Vennemann, N., Purkarthofer, G.. Dächer als Sonnenkollektoren - Der Elastomer-Metall-Absorber. Tagungsband der 3. Osnabrücker Energie- und Umwelttagung, Osnabrück Germany, 3-4 Maj, 2001.
Tepe, R., Bartelsen, B., Rockendorf, G., Vennemann, N., Simetzberger, A., Purkarthofer, G.. Façade and Roof Integrated Solar Collectors with a Combination of Elastomer Tubes and Metal Form Sheet Elements. Northsun 2001, Leiden The Netherlands, 6-8 Maj, 2001.
Tepe, R., Bartelsen, B., Rockendorf, G.. Façade amd Roof Integrated Solar Collectors with a Combination of Elastomer Tubes and Metal Form Sheet Elements. Absorber and Collector Development and Assessment : Technical Report EU-Project JOR3-CT98-0236. 2000.
Tepe, R., Bartelsen, B., Rockendorf, G., Purkarthofer, G.. Façade and Roof Integrated Solar Collectors with a Combination of Elastomer Tubes and Metal Form Sheet Elements. Operation and Assessment of Test Systems : Technical Report EU-Project JOR3-CT98-0236. 2000.
Tepe, R., Bartelsen, B., Rockendorf, G., Purkarthofer, G.. Façade and Roof Integrated Solar Collectors with a Combination of Elastomer Tubes and Metal Form Sheet Elements. Planning and Construction of Test Systems : Technical Report EU-Project JOR3-CT98-0236. 2000.
Tepe, R., Lorenz, Klaus. Façade and Roof Integrated Solar Collectors with a Combination of Elastomer Tubes and Metal Form Sheet Elements. System Concepts and Simulation : Technical Report EU-Project JOR3-CT98-0236. 2000.
Tepe, R., Lorenz, Klaus, Swan, T., Bartelsen, B., Rockendorf, G., Heusel, H., Pasberg, H.. Façade and Roof Integrated Solar Collectors with a Combination of Elastomer Tubes and Metal Form Sheet Elements. Absorber Form Sheet Production : Technical Report EU-Project JOR3-CT98-0236. 2000.
Tepe, R., Bartelsen, B., Rockendorf, G., Vennemann, N., Purkarthofer, G.. Metalldächer als Sonnenkollektoren - Idee und Entwicklungsarbeiten. Paper presented at the conference Inter Solar 2000 , Freiburg Germany, 7-9 July, 2000.
Bartelsen, B., Rockendorf, G., Vennemann, N., Tepe, R., Lorenz, Klaus, Purkarthofer, G.. Elastomer-metal-absorber : development and application. Solar Energy, Vol. 67, Nr. 4-6, 1999, s. 215-226.
For further information contact Mats Rönnelid (mrd@du.se) or Frank Fiedler (ffi@du.se)
