TY - JOUR A1 - Kearney, David W. A1 - Kelly, Bruce A1 - Herrmann, Ulf A1 - Cable, R. A1 - Pacheco, J. A1 - Mahoney, R. A1 - Price, Henry A1 - Blake, D. A1 - Nava, P. A1 - Potrovitza, N. T1 - Engineering Aspects of a Molten Salt Heat Transfer Fluid in a Trough Solar Field JF - Energy : the international journal Y1 - 2002 U6 - https://doi.org/10.1016/S0360-5442(03)00191-9 SN - 0360-5442 N1 - SolarPACES 2002, Zürich, Switzerland, 4–6 September 2002 VL - 29 IS - 5-6 (Special Issue SolarPaces) SP - 861 EP - 870 ER - TY - JOUR A1 - Dersch, Jürgen A1 - Geyer, Michael A1 - Herrmann, Ulf A1 - Jones, Scott A. A1 - Kelly, Bruce A1 - Kistner, Rainer A1 - Ortmanns, Winfried A1 - Pitz-Paal, Robert A1 - Price, Henry T1 - Trough integration into power plants—a study on the performance and economy of integrated solar combined cycle systems JF - Energy : the international journal Y1 - 2004 U6 - https://doi.org/10.1016/S0360-5442(03)00199-3 SN - 0360-5442 N1 - SolarPACES 2002, Zürich, Switzerland, 4–6 September 2002 VL - 29 IS - 5-6 (Special Issue SolarPaces) SP - 947 EP - 959 ER - TY - JOUR A1 - Herrmann, Ulf A1 - Lippke, F. T1 - The influence of transients on the design of DSG solar fields JF - Journal de Physique IV : proceedings Y1 - 1999 SN - 2-86883-402-7 U6 - https://doi.org/10.1051/jp4:1999377 SN - 1764-7177 (Online) SN - 1155-4339 (Print) VL - 9 IS - PR3 SP - 489 EP - 494 ER - TY - JOUR A1 - Kluczka, Sven A1 - Eckstein, Julian A1 - Alexopoulos, Spiros A1 - Vaeßen, Christiane A1 - Roeb, Martin T1 - Process simulation for solar steam and dry reforming JF - Energy procedia : Proceedings of the SolarPACES 2013 International Conference N2 - In co-operation with the German Aerospace Center, the Solar-Institut Jülich has been analyzing the different technologies that are available for methanol production from CO2 using solar energy. The aim of the project is to extract CO2 from industrial exhaust gases or directly from the atmosphere to recycle it by use of solar energy. Part of the study was the modeling and simulating of a methane reformer for the production of synthesis gas, which can be operated by solar or hybrid heat sources. The reformer has been simplified in such a way that the model is accurate and enables fast calculations. The developed pseudo-homogeneous one- dimensional model can be regarded as a kind of counter-current heat exchanger and is able to incorporate a steam reforming reaction as well as a dry reforming reaction. Y1 - 2014 U6 - https://doi.org/10.1016/j.egypro.2014.03.092 SN - 1876-6102 (E-Journal) VL - 49 SP - 850 EP - 859 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Puppe, Michael A1 - Giuliano, Stefano A1 - Frantz, Cathy A1 - Uhlig, Ralf A1 - Schumacher, Ralph A1 - Ibraheem, Wagdi A1 - Schmalz, Stefan A1 - Waldmann, Barbara A1 - Guder, Christoph A1 - Peter, Dennis A1 - Schwager, Christian A1 - Teixeira Boura, Cristiano José A1 - Alexopoulos, Spiros A1 - Spiegel, Michael A1 - Wortmann, Jürgen A1 - Hinrichs, Matthias A1 - Engelhard, Manfred A1 - Aust, Michael T1 - Techno-economic optimization of molten salt solar tower plants JF - AIP Conference Proceedings art.no. 040033 N2 - In this paper the results of a techno-economic analysis of improved and optimized molten salt solar tower plants (MSSTP plants) are presented. The potential improvements that were analyzed include different receiver designs, different designs of the HTF-system and plant control, increased molten salt temperatures (up to 640°C) and multi-tower systems. Detailed technological and economic models of the solar field, solar receiver and high temperature fluid system (HTF-system) were developed and used to find potential improvements compared to a reference plant based on Solar Two technology and up-to-date cost estimations. The annual yield model calculates the annual outputs and the LCOE of all variants. An improved external tubular receiver and improved HTF-system achieves a significant decrease of LCOE compared to the reference. This is caused by lower receiver cost as well as improvements of the HTF-system and plant operation strategy, significantly reducing the plant own consumption. A novel star receiver shows potential for further cost decrease. The cavity receiver concepts result in higher LCOE due to their high investment cost, despite achieving higher efficiencies. Increased molten salt temperatures seem possible with an adapted, closed loop HTF-system and achieve comparable results to the original improved system (with 565°C) under the given boundary conditions. In this analysis all multi tower systems show lower economic viability compared to single tower systems, caused by high additional cost for piping connections and higher cost of the receivers. REFERENCES Y1 - 2019 U6 - https://doi.org/10.1063/1.5067069 VL - 2033 IS - Issue 1 PB - AIP Publishing CY - Melville, NY 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 - https://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 - JOUR A1 - Kearney, D. A1 - Herrmann, Ulf A1 - Nava, P. A1 - Kelly, B. A1 - Mahoney, R. A1 - Pacheco, J. A1 - Cable, R. A1 - Potrovitza, N. A1 - Blake, D. A1 - Price, H. T1 - Assessment of a Molten Salt Heat Transfer Fluid in a Parabolic Trough Solar Field JF - Journal of Solar Energy Engineering Y1 - 2003 U6 - https://doi.org/10.1115/1.1565087 SN - 1528-8986 VL - 125 IS - 2 SP - 170 EP - 176 ER - TY - JOUR A1 - Herrmann, Ulf A1 - Schwarzenbart, Marc A1 - Dittmann-Gabriel, Sören T1 - Speicher statt Kohle. Integration thermischer Stromspeicher in vorhandene Kraftwerksstandorte JF - BWK : Das Energie-Fachmagazin Y1 - 2019 SN - 1436-4883 VL - 71 IS - 4 SP - 42 EP - 45 PB - Springer-VDI-Verl. CY - Düsseldorf ER - TY - JOUR A1 - Wolisz, Henryk A1 - Schütz, Thomas A1 - Blanke, Tobias A1 - Hagenkamp, Markus A1 - Kohrn, Markus A1 - Wesseling, Mark A1 - Müller, Dirk T1 - Cost optimal sizing of smart buildings' energy system components considering changing end-consumer electricity markets JF - Energy Y1 - 2017 U6 - https://doi.org/10.1016/j.energy.2017.06.025 VL - 137 SP - 715 EP - 728 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Reger, Vitali A1 - Kuhnhenne, Markus A1 - Ebbert, Thiemo A1 - Hachul, Helmut A1 - Blanke, Tobias A1 - Döring, Bernd T1 - Nutzung erneuerbarer Energien durch thermische Aktivierung von Komponenten aus Stahl JF - Stahlbau N2 - Die Versorgung von Neubauten soll möglichst weitgehend unabhängig von fossilen Energieträgern erfolgen. Erneuerbare Energien spielen dafür eine gewichtige Rolle. Eine gute Möglichkeit, erneuerbare Energien ohne viel zusätzlichen Aufwand nutzbar zu machen, ist, bereits vorhandenen Komponenten im Gebäude zusätzliche Funktionen zu geben. Hier kann bspw. die Fassade oder das Dach solarthermisch aktiviert oder durch Fotovoltaikmodule ergänzt werden. Auch Tiefgründungen können neben der statischen Funktion noch eine geothermische Funktion zur Aufnahme oder Abgabe von Wärme erhalten. Neben der Erzeugung bietet sich auch für die Verteilung der Wärme oder Kälte im Gebäude die Integration in Bauteile an. Hier kann bspw. der Boden durch eine Fußbodenheizung oder die Decke durch Deckenstrahlplatten aktiviert werden. Im Rahmen der Veröffentlichung wird auf die thermische Aktivierung von Stahlkomponenten eingegangen. Es wird eine Lösung vorgestellt, die vorgehängte hinterlüftete Stahlfassade (VHF) solarthermisch zu aktivieren. Außerdem werden zwei Möglichkeiten zur geothermischen Aktivierung von Tiefgründungen mittels Stahlpfählen gezeigt. Zuletzt wird ein System zur thermischen Aktivierung von Stahltrapezprofilen an der Decke erläutert, welches Wärme zuführen oder bei Bedarf abführen kann. Y1 - 2020 U6 - https://doi.org/10.1002/stab.202000031 SN - 1437-1049 VL - 2020 IS - Volume 89, Issue 6512-519 SP - 512 EP - 519 PB - Ernst & Sohn CY - Berlin ER -