TY  - JOUR
A1  - Göttsche, Joachim
A1  - Hove, T.
T1  - Mapping global, diffuse and beam solar radiation over Zimbabwe / T. Hove ; J. Göttsche
JF  - Renewable energy. 18 (1999), H. 4
Y1  - 1999
SN  - 1879-0682
SP  - 535
EP  - 556
ER  - 
TY  - CHAP
A1  - Sauerborn, Markus
A1  - Hoffschmidt, Bernhard
A1  - Göttsche, Joachim
A1  - Schmitz, S.
A1  - Rebholz, C.
A1  - Ansorge, F.
A1  - Ifland, D.
T1  - Mini-Spiegel-Array für solarthermische Kraftwerke : [Vortragsfolien]
T2  - DPG-Frühjahrstagung, Arbeitskreis Energie, Hamburg 03.03.2009
Y1  - 2009
SP  - 1
EP  - 10
ER  - 
TY  - JOUR
A1  - Göttsche, Joachim
A1  - Alexopoulos, Spiros
A1  - Dümmler, Andreas
A1  - Maddineni, S. K.
T1  - Multi-Mirror Array Calculations With Optical Error
N2  - The optical performance of a 2-axis solar concentrator was simulated with the COMSOL Multiphysics® software. The concentrator consists of a mirror array, which was created using the application builder. The mirror facets are preconfigured to form a focal point. During tracking all mirrors are moved simultaneously in a coupled mode by 2 motors in two axes, in order to keep the system in focus with the moving sun. Optical errors on each reflecting surface were implemented in combination with the solar angular cone of ± 4.65 mrad. As a result, the intercept factor of solar radiation that is available to the receiver was calculated as a function of the transversal and longitudinal angles of incidence. In addition, the intensity distribution on the receiver plane was calculated as a function of the incidence angles.
KW  - solar process heat
KW  - concentrating collector
KW  - raytracing
KW  - point-focussing system
Y1  - 2019
SP  - 1
EP  - 6
ER  - 
TY  - JOUR
A1  - Blanke, Tobias
A1  - Hagenkamp, Markus
A1  - Döring, Bernd
A1  - Göttsche, Joachim
A1  - Reger, Vitali
A1  - Kuhnhenne, Markus
T1  - Net-exergetic, hydraulic and thermal optimization of coaxial heat exchangers using fixed flow conditions instead of fixed flow rates
JF  - Geothermal Energy
N2  - Previous studies optimized the dimensions of coaxial heat exchangers using constant mass fow rates as a boundary condition. They show a thermal optimal circular ring width of nearly zero. Hydraulically optimal is an inner to outer pipe radius ratio of 0.65 for turbulent and 0.68 for laminar fow types. In contrast, in this study, fow conditions in the circular ring are kept constant (a set of fxed Reynolds numbers) during optimization. This approach ensures fxed fow conditions and prevents inappropriately high or low mass fow rates. The optimization is carried out for three objectives: Maximum energy gain, minimum hydraulic efort and eventually optimum net-exergy balance. The optimization changes the inner pipe radius and mass fow rate but not the Reynolds number of the circular ring. The thermal calculations base on Hellström’s borehole resistance and the hydraulic optimization on individually calculated linear loss of head coefcients. Increasing the inner pipe radius results in decreased hydraulic losses in the inner pipe but increased losses in the circular ring. The net-exergy diference is a key performance indicator and combines thermal and hydraulic calculations. It is the difference between thermal exergy fux and hydraulic efort. The Reynolds number in the circular ring is instead of the mass fow rate constant during all optimizations. The result from a thermal perspective is an optimal width of the circular ring of nearly zero. The hydraulically optimal inner pipe radius is 54% of the outer pipe radius for laminar fow and 60% for turbulent fow scenarios. Net-exergetic optimization shows a predominant infuence of hydraulic losses, especially for small temperature gains. The exact result depends on the earth’s thermal properties and the fow type. Conclusively, coaxial geothermal probes’ design should focus on the hydraulic optimum and take the thermal optimum as a secondary criterion due to the dominating hydraulics.
Y1  - 2021
U6  - http://dx.doi.org/10.1186/s40517-021-00201-3
SN  - 2195-9706
N1  - Corresponding author: Tobias Blanke
VL  - 9
IS  - Article number: 19
PB  - Springer
CY  - Berlin
ER  - 
TY  - CHAP
A1  - Oetringer, Kerstin
A1  - Dümmler, Andreas
A1  - Göttsche, Joachim
T1  - Neues Modell zur 1D-Simulation der indirekten Verdunstungskühlung
T2  - DKV‐Tagung 2020, AA II.1
Y1  - 2020
N1  - Deutsche Kälte- und Klimatagung 2020 online
SP  - 1
EP  - 13
ER  - 
TY  - CHAP
A1  - Warerkar, S.
A1  - Schmitz, S.
A1  - Göttsche, Joachim
A1  - Hoffschmidt, Bernhard
A1  - Tamme, R.
T1  - Performance analysis of an air-sand heat exchanger prototype for high-temperature storage
T2  - EuroSun 2008 : 1st International Conference on Solar Heating, Cooling and Buildings ; 7th - 10th October 2008, Lisbon, Portugal : key lectures / ISES, International Solar Energy Society. Vol. 1
Y1  - 2008
SN  - 978-1-61782-228-5
SP  - 2215
EP  - 2222
PB  - Sociedade Portuguesa De Energia Solar (SPES)
CY  - Lissabon
ER  - 
TY  - JOUR
A1  - Reger, Vitali
A1  - Kuhnhenne, Markus
A1  - Hachul, Helmut
A1  - Döring, Bernd
A1  - Blanke, Tobias
A1  - Göttsche, Joachim
T1  - Plusenergiegebäude 2.0 in Stahlleichtbauweise
JF  - Stahlbau
Y1  - 2019
U6  - http://dx.doi.org/10.1002/stab.201900034
SN  - 1437-1049 (E-journal), 0038-9145 (print)
VL  - 88
IS  - 6
SP  - 522
EP  - 528
PB  - Ernst & Sohn
CY  - Berlin
ER  - 
TY  - CHAP
A1  - Baumann, Torsten
A1  - Teixeira Boura, Cristiano José
A1  - Eckstein, Julian
A1  - Dabrowski, Jan
A1  - Göttsche, Joachim
A1  - Hoffschmidt, Bernhard
A1  - Schmitz, Stefan
A1  - Zunft, Stefan
T1  - Properties of bulk materials for high-temperature air-sand heat exchangers
T2  - 30th ISES Biennial Solar World Congress 2011 : Kassel, Germany, 28 August - 2 September 2011. Vol. 2
Y1  - 2012
SN  - 978-1-61839-364-7
SP  - 1270
EP  - 1278
PB  - Curran
CY  - Red Hook, NY
ER  - 
TY  - JOUR
A1  - Sattler, Johannes, Christoph
A1  - Röger, Marc
A1  - Schwarzbözl, Peter
A1  - Buck, Reiner
A1  - Macke, Ansgar
A1  - Raeder, Christian
A1  - Göttsche, Joachim
T1  - Review of heliostat calibration and tracking control methods
JF  - Solar Energy
N2  - Large scale central receiver systems typically deploy between thousands to more than a hundred thousand heliostats. During solar operation, each heliostat is aligned individually in such a way that the overall surface normal bisects the angle between the sun’s position and the aim point coordinate on the receiver. Due to various tracking error sources, achieving accurate alignment ≤1 mrad for all the heliostats with respect to the aim points on the receiver without a calibration system can be regarded as unrealistic. Therefore, a calibration system is necessary not only to improve the aiming accuracy for achieving desired flux distributions but also to reduce or eliminate spillage. An overview of current larger-scale central receiver systems (CRS), tracking error sources and the basic requirements of an ideal calibration system is presented. Leading up to the main topic, a description of general and specific terms on the topics heliostat calibration and tracking control clarifies the terminology used in this work. Various figures illustrate the signal flows along various typical components as well as the corresponding monitoring or measuring devices that indicate or measure along the signal (or effect) chain. The numerous calibration systems are described in detail and classified in groups. Two tables allow the juxtaposition of the calibration methods for a better comparison. In an assessment, the advantages and disadvantages of individual calibration methods are presented.
Y1  - 2020
U6  - http://dx.doi.org/10.1016/j.solener.2020.06.030
VL  - 207
SP  - 110
EP  - 132
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - CHAP
A1  - Göttsche, Joachim
A1  - Röther, Sascha
T1  - Science College Overbach - Innovatives Bildungszentrum in Jülich-Barmen
T2  - 18. Internationale Passivhaustagung, Aachen, April 2014
N2  - Preprint der Autoren
Y1  - 2014
ER  - 
TY  - CHAP
A1  - Achenbach, Timm
A1  - Geimer, K.
A1  - Göttsche, Joachim
A1  - Hoffschmidt, Bernhard
A1  - Lynen, A.
A1  - Bauer, J.
T1  - Simulation and flow measurements of volumetric high temperature absorbers for solar tower power plants
T2  - SolarPACES 2011 : concentrating solar power and chemical energy systems : 20 - 23 September, 2011, Granada, Spain
Y1  - 2011
CY  - Granada
ER  - 
TY  - CHAP
A1  - Achenbach, Timm
A1  - Geimer, Konstantin
A1  - Lynen, Arthur
A1  - Göttsche, Joachim
A1  - Hoffschmidt, Bernhard
T1  - Simulation of thermo-mechanical processes in open volumetric absorber modules
T2  - SolarPaces 2012 : concentrating solar power and chemical energy systems : Sept. 11 - 14 2012, Marrakech, Marokko
Y1  - 2012
SP  - 1
EP  - 8
ER  - 
TY  - JOUR
A1  - Göttsche, Joachim
A1  - Blum, K.
A1  - Schumacher, J.
T1  - Simulationsprogramme in der Solarenergie-Ausbildung / Blum, K. ; Göttsche, J. ; Schumacher, J.
JF  - Energie für die Zukunft : : 28. Juni bis 1. Juli 1994; [Tagungsbericht] / 9. Internationales Sonnenforum '94. [Hrsg. Deutsche Gesellschaft für Sonnenenergie e.V. - DGS. Red. A. Hohmann ...] ; Bd. 2
Y1  - 1994
N1  - DGS 1994 - 9. ISF - Stuttgart ; Internationales Sonnenforum ; <9, 1994, Stuttgart>
SP  - 1786
EP  - 1791
PB  - DGS-Sonnenenergie-Verl.
CY  - München
ER  - 
TY  - JOUR
A1  - Göttsche, Joachim
A1  - Hoffschmidt, Bernhard
A1  - Schmitz, Stefan
A1  - Sauerborn, Markus
T1  - Solar Concentrating Systems Using Small Mirror Arrays
JF  - Journal of solar energy engineering
Y1  - 2010
SN  - 0199-6231
VL  - Vol. 132
IS  - Iss. 1
SP  - 4 S.
ER  - 
TY  - JOUR
A1  - Göttsche, Joachim
A1  - Hoffschmidt, Bernhard
A1  - Schmitz, Stefan
A1  - Sauerborn, Markus
T1  - Solar Concentrating Systems Using Small Mirror Arrays / Göttsche, Joachim ; Hoffschmidt, Bernhard ; Schmitz, Stefan ; Sauerborn, Markus ; Buck, Reiner ; Teufel, Edgar ; Badstübner, Karin ; Ifland, David ; Rebholz, Christian
JF  - Proceedings of the 2nd International Conference on Energy Sustainability - 2008 : : presented ... August 10 - 14, 2008, Jacksonville, Florida, USA / sponsored by Advanced Energy Systems Division, ASME; Solar Energy Division, ASME
Y1  - 2009
SN  - 9780791843208
N1  - International Conference on Energy Sustainability ; (2 : ; 2008.08.10-14 : ; Jacksonville, Fla.) ; ES ; (2 : ; 2008.08.10-14 : ; Jacksonville, Fla.)
SP  - 1
EP  - 5
PB  - ASME
CY  - New York, NY
ER  - 
TY  - JOUR
A1  - Göttsche, Joachim
A1  - Gabrysch, K.
A1  - Delahaye, A.
A1  - Schwarzer, Klemens
T1  - Solar-Campus Juelich - Energy performance and indoor climate
JF  - AIVC 23rd conference - EPIC 2002 AIVC (in conjunction with 3rd European Conference on Energy Performance and Indoor Climate in Buildings) - 23-26 October 2002 - Lyon - France - vol 2
Y1  - 2002
SP  - 381
EP  - 386
ER  - 
TY  - JOUR
A1  - Göttsche, Joachim
A1  - Delahaye, A.
A1  - Gabrysch, K.
A1  - Schwarzer, Klemens
T1  - Solar-Campus Jülich - Nutzung solarer Gewinne in Gebäuden
JF  - 13. Symposium Thermische Solarenergie : 14. bis 16. Mai 2003, Kloster Banz / [Wiss. Gesamtleitung: Hans Müller-Steinhagen]. Otti-Energie-Kolleg
Y1  - 2003
SN  - 3-934681-26-3
N1  - Symposium Thermische Solarenergie <13, 2003, Kloster Banz> ; Posterbeiträge : Simulation
SP  - 362
EP  - 367
PB  - Ostbayerisches Technologie-Transfer-Inst., OTTI
CY  - Regensburg
ER  - 
TY  - JOUR
A1  - Göttsche, Joachim
A1  - Hoffschmidt, Bernhard
A1  - Böhnisch, Helmut
A1  - Herkel, Sebastian
T1  - Solarisierung von Altbauten / Bernhard Hoffschmidt ; Helmut Böhnisch ; Joachim Göttsche ; Sebastian Herkel
JF  - Wärme und Kälte - Energie aus Sonne und Erde : Jahrestagung des Forschungsverbunds Sonnenenergie in Kooperation mit der Landesinitiative Zukunftsenergie NRW / Stadermann, Gerd, Hrsg.
Y1  - 2005
SP  - 99
EP  - 105
PB  - Forschungsverbund Sonnenenergie
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Göttsche, Joachim
A1  - Tamme, Rainer
A1  - Nunez, Thomas
T1  - Speicherung für Hochtemperaturwärme / Rainer Tamme ; Joachim Göttsche ; Thomas Nunez
JF  - Wärme und Kälte - Energie aus Sonne und Erde : Jahrestagung des Forschungsverbunds Sonnenenergie in Kooperation mit der Landesinitiative Zukunftsenergie NRW / Stadermann, Gerd, Hrsg.
Y1  - 2005
SP  - 126
EP  - 131
PB  - Forschungsverbund Sonnenenergie
CY  - Berlin
ER  - 
TY  - CHAP
A1  - Göttsche, Joachim
A1  - Hoffschmidt, Bernhard
A1  - Schmitz, S.
A1  - Sauerborn, Markus
A1  - Rebholz, C.
A1  - Iffland, D.
A1  - Badstübner, R.
A1  - Buck, R.
A1  - Teufel, E.
T1  - Test of a mini-mirror array for solar concentrating systems
T2  - EuroSun 2008 : 1st International Conference on Solar Heating, Cooling and Buildings ; 7th - 10th October 2008, Lisbon, Portugal : key lectures / ISES, International Solar Energy Society. Vol. 1
Y1  - 2008
SN  - 978-1-61782-228-5
SP  - 1242
EP  - 1250
PB  - Sociedade Portuguesa De Energia Solar (SPES)
CY  - Lissabon
ER  -