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Papers by Stephan Fischer
Energy Procedia, 2014
IEA SHC Task 39 is dedicated to the development, optimization and deployment of materials and des... more IEA SHC Task 39 is dedicated to the development, optimization and deployment of materials and designs for polymer based solar thermal systems and components. To increase the confidence in polymeric solar thermal applications, Task 39 actively supports international research activities and seeks to promote successful applications and state-of-the-art products. For the SHC conference 2013, different polymeric components suitable for domestic hot water preparation and space heating were singled out for an exhibition. Promising polymeric collectors, air collectors, thermosiphons, storage tanks and other components from industrial partners all over the world were brought to Freiburg and assembled at the Fraunhofer-Institute for Solar Energy Systems ISE. The resulting SHC Task 39 Exhibition of polymeric components shows the feasibility of all-polymeric solar thermal systems and highlights their potential, especially as scalable and modular applications for building integration or as export products to sunny regions.
AIP Conference Proceedings
The general perception for the application of solar concentrating collectors in moderate climates... more The general perception for the application of solar concentrating collectors in moderate climates as in Central Europe and similar areas in the world, is that their energy yield is not sufficient. Clearly, the Direct Normal Irradiation (DNI) of 1000 kWh/(m² *a) is significantly lower than in sunny areas where it amounts to 2000 kWh/(m² *a) or even more. Nevertheless, if compared with stationary collectors, line focusing collectors can deliver heat at a comparable level but at higher operation temperatures. Simulations with two different tools were performed to calculate the annual energy yield from parabolic trough collectors for temperatures between 50 and 100°C, to benchmark with stationary collectors, which are commercially successful. For a variety of moderate sites worldwide parabolic trough collectors deliver the same amount of heat as stationary collectors at operation temperatures around 75°C. The amount of costs are still difficult to obtain for parabolic trough collectors. For solar plants installed and commissioned, costs for efficient collectors are reported 230 to 300 €/m² for field sizes of 10.000 m². Troughs can already be competitive at operation temperatures below 100°C. Thus if stationary collectors are successful in a market, there is the opportunity for parabolic trough collectors to succeed at least for solar field sizes from several 100 m² upwards.
1 Institute for Thermodynamics and Thermal Engineering (ITW) University of Stuttgart Pfaffenwaldr... more 1 Institute for Thermodynamics and Thermal Engineering (ITW) University of Stuttgart Pfaffenwaldring 6, 70550 Stuttgart, Germany Tel.: +49 711 / 685-63245, Fax: +49 711 / 685-63231 Email: fischer@itw.uni-stuttgart.de / Internet: www.itw.uni-stuttgart.de 2 LNEG Laboratorio Nacional de Energia e Geologia, Portugal 3 SP Technical Research Institute of Sweden, Sweden 4 Austrian Institute of Technology, Energy Department, Austria
AIP Conference Proceedings, 2017
The technology of parabolic trough collectors (PTC) is used widely in concentrating Solar Power (... more The technology of parabolic trough collectors (PTC) is used widely in concentrating Solar Power (CSP) plants worldwide. However this type of large-size collectors cannot be officially tested by an accredited laboratory and certified by an accredited certification body so far, as there is no standard adapted to its particularity, and the current published standard for solar thermal collectors are not completely applicable to them. Recently some standardization committees have been working on this technology. This paper aims to give a summary of the standardized testing methodology of large-size PTC for CSP plants, giving the physical model chosen for modeling the thermal performance of the collector in the new revision of standard ISO 9806 and the points still to be improved in the standard draft IEC 62862-3-2. In this paper, a summary of the testing validation performed on one parabolic trough collector installed in one of the test facilities at the Plataforma Solar de Almería (PSA) with this new model is also presented.
Proceedings of the ISES Solar World Congress 2011, 2011
Proceedings of the ISES Solar World Congress 2011, 2011
Proceedings of the ISES Solar World Congress 2011, 2011
Proceedings of the EuroSun 2010 Conference, 2010
The European project QAIST-"Quality Assurance for Solar thermal heating and cooling technologies"... more The European project QAIST-"Quality Assurance for Solar thermal heating and cooling technologies", funded by the Intelligent Energy Europe program and by the participating countries, gathers 15 participating organizations including the European Solar Thermal Industry Federation ESTIF and major testing and research institutes in Europe. The objective of the project is to enhance the competitiveness of the European Solar thermal industry and further increase consumer confidence through improved standards and certification schemes, harmonization in testing and certification and a wide dissemination of the quality concept throughout Europe. Global harmonization in collector standards and certification is also on the QAIST agenda and has taken a large step forward through CEN/ISO cooperation and a strong European representation in the new IEA SH&C task 43.
Proceedings of the ISES Solar World Congress 2011, 2011
Energy Procedia, 2014
IEA SHC Task 39 is dedicated to the development, optimization and deployment of materials and des... more IEA SHC Task 39 is dedicated to the development, optimization and deployment of materials and designs for polymer based solar thermal systems and components. To increase the confidence in polymeric solar thermal applications, Task 39 actively supports international research activities and seeks to promote successful applications and state-of-the-art products. For the SHC conference 2013, different polymeric components suitable for domestic hot water preparation and space heating were singled out for an exhibition. Promising polymeric collectors, air collectors, thermosiphons, storage tanks and other components from industrial partners all over the world were brought to Freiburg and assembled at the Fraunhofer-Institute for Solar Energy Systems ISE. The resulting SHC Task 39 Exhibition of polymeric components shows the feasibility of all-polymeric solar thermal systems and highlights their potential, especially as scalable and modular applications for building integration or as export products to sunny regions.
AIP Conference Proceedings
The general perception for the application of solar concentrating collectors in moderate climates... more The general perception for the application of solar concentrating collectors in moderate climates as in Central Europe and similar areas in the world, is that their energy yield is not sufficient. Clearly, the Direct Normal Irradiation (DNI) of 1000 kWh/(m² *a) is significantly lower than in sunny areas where it amounts to 2000 kWh/(m² *a) or even more. Nevertheless, if compared with stationary collectors, line focusing collectors can deliver heat at a comparable level but at higher operation temperatures. Simulations with two different tools were performed to calculate the annual energy yield from parabolic trough collectors for temperatures between 50 and 100°C, to benchmark with stationary collectors, which are commercially successful. For a variety of moderate sites worldwide parabolic trough collectors deliver the same amount of heat as stationary collectors at operation temperatures around 75°C. The amount of costs are still difficult to obtain for parabolic trough collectors. For solar plants installed and commissioned, costs for efficient collectors are reported 230 to 300 €/m² for field sizes of 10.000 m². Troughs can already be competitive at operation temperatures below 100°C. Thus if stationary collectors are successful in a market, there is the opportunity for parabolic trough collectors to succeed at least for solar field sizes from several 100 m² upwards.
1 Institute for Thermodynamics and Thermal Engineering (ITW) University of Stuttgart Pfaffenwaldr... more 1 Institute for Thermodynamics and Thermal Engineering (ITW) University of Stuttgart Pfaffenwaldring 6, 70550 Stuttgart, Germany Tel.: +49 711 / 685-63245, Fax: +49 711 / 685-63231 Email: fischer@itw.uni-stuttgart.de / Internet: www.itw.uni-stuttgart.de 2 LNEG Laboratorio Nacional de Energia e Geologia, Portugal 3 SP Technical Research Institute of Sweden, Sweden 4 Austrian Institute of Technology, Energy Department, Austria
AIP Conference Proceedings, 2017
The technology of parabolic trough collectors (PTC) is used widely in concentrating Solar Power (... more The technology of parabolic trough collectors (PTC) is used widely in concentrating Solar Power (CSP) plants worldwide. However this type of large-size collectors cannot be officially tested by an accredited laboratory and certified by an accredited certification body so far, as there is no standard adapted to its particularity, and the current published standard for solar thermal collectors are not completely applicable to them. Recently some standardization committees have been working on this technology. This paper aims to give a summary of the standardized testing methodology of large-size PTC for CSP plants, giving the physical model chosen for modeling the thermal performance of the collector in the new revision of standard ISO 9806 and the points still to be improved in the standard draft IEC 62862-3-2. In this paper, a summary of the testing validation performed on one parabolic trough collector installed in one of the test facilities at the Plataforma Solar de Almería (PSA) with this new model is also presented.
Proceedings of the ISES Solar World Congress 2011, 2011
Proceedings of the ISES Solar World Congress 2011, 2011
Proceedings of the ISES Solar World Congress 2011, 2011
Proceedings of the EuroSun 2010 Conference, 2010
The European project QAIST-"Quality Assurance for Solar thermal heating and cooling technologies"... more The European project QAIST-"Quality Assurance for Solar thermal heating and cooling technologies", funded by the Intelligent Energy Europe program and by the participating countries, gathers 15 participating organizations including the European Solar Thermal Industry Federation ESTIF and major testing and research institutes in Europe. The objective of the project is to enhance the competitiveness of the European Solar thermal industry and further increase consumer confidence through improved standards and certification schemes, harmonization in testing and certification and a wide dissemination of the quality concept throughout Europe. Global harmonization in collector standards and certification is also on the QAIST agenda and has taken a large step forward through CEN/ISO cooperation and a strong European representation in the new IEA SH&C task 43.
Proceedings of the ISES Solar World Congress 2011, 2011