TY - JOUR A1 - Göttsche, Joachim A1 - Goetzberger, Adolf A1 - Dengler, J. A1 - Rommel, M. (u.a.) T1 - A new transparently insulated, bifacially irradiated solar flat-plate collector / A. Goetzberger ; J. Dengler ; M. Rommel ; J. Göttsche ; V. Wittwer JF - Solar energy. 49 (1992), H. 5 Y1 - 1992 SN - 0038-092X SP - 403 EP - 411 ER - TY - JOUR A1 - Schwager, Christian A1 - Flesch, Robert A1 - Schwarzbözl, Peter A1 - Herrmann, Ulf A1 - Teixeira Boura, Cristiano José T1 - Advanced two phase flow model for transient molten salt receiver system simulation JF - Solar Energy N2 - In order to realistically predict and optimize the actual performance of a concentrating solar power (CSP) plant sophisticated simulation models and methods are required. This paper presents a detailed dynamic simulation model for a Molten Salt Solar Tower (MST) system, which is capable of simulating transient operation including detailed startup and shutdown procedures including drainage and refill. For appropriate representation of the transient behavior of the receiver as well as replication of local bulk and surface temperatures a discretized receiver model based on a novel homogeneous two-phase (2P) flow modelling approach is implemented in Modelica Dymola®. This allows for reasonable representation of the very different hydraulic and thermal properties of molten salt versus air as well as the transition between both. This dynamic 2P receiver model is embedded in a comprehensive one-dimensional model of a commercial scale MST system and coupled with a transient receiver flux density distribution from raytracing based heliostat field simulation. This enables for detailed process prediction with reasonable computational effort, while providing data such as local salt film and wall temperatures, realistic control behavior as well as net performance of the overall system. Besides a model description, this paper presents some results of a validation as well as the simulation of a complete startup procedure. Finally, a study on numerical simulation performance and grid dependencies is presented and discussed. KW - Molten salt solar tower KW - Molten salt receiver system KW - Dynamic simulation KW - Two-phase modelling KW - Transient flux distribution Y1 - 2022 U6 - http://dx.doi.org/10.1016/j.solener.2021.12.065 SN - 0038-092X (print) SN - 1471-1257 (online) VL - 232 SP - 362 EP - 375 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Göttsche, Joachim A1 - Reilly, S. A1 - Wittwer, Volker T1 - Advanced window systems and building energy performance / S. Reilly ; J. Göttsche ; V. Wittwer JF - Solar World Congress, 1991 : proceedings of the biennial congress of the International Solar Energy Society, Denver, Colorado, USA, 19-23 August 1991 / ed. by M. E. Arden ... Y1 - 1991 SN - 0-08-041690-X SP - 3211 EP - 3216 PB - Pergamon Press CY - Oxford [u.a.] ER - TY - JOUR A1 - Alexopoulos, Spiros A1 - Hoffschmidt, Bernhard T1 - Advances in solar tower technology JF - Wiley interdisciplinary reviews : Energy and Environment : WIREs Y1 - 2017 U6 - http://dx.doi.org/10.1002/wene.217 SN - 2041-840X VL - 6 IS - 1 SP - 1 EP - 19 PB - Wiley CY - Weinheim ER - TY - JOUR A1 - Meliß, Michael T1 - Aktuelle Aspekte der Windkraftnutzung JF - Energiewirtschaftliche Tagesfragen. Jg. 47 (1997), H. 9 Y1 - 1997 SN - 0013-743X SP - 531 EP - 532 ER - TY - JOUR A1 - Göttsche, Joachim A1 - Gabrysch, Karten T1 - Analyse der Studentenwohnungen des Solar-Campus Jülich / Göttsche, Joachim ; Gabrysch, Karten JF - Umwelt, Gebäude & Gesundheit : von Energieeffizienz zur Raumlufthygiene ; Ergebnisse des 6. Fachkongresses der Arbeitsgemeinschaft Ökologischer Forschungsinstitute (AGÖF) am 20. und 21. September 2001 in Nürnberg / Arbeitsgemeinschaft Ökologischer Forschungsinstitute (AGÖF) e.V. [Red.: Sabine Weber] Y1 - 2001 SN - 3-930576-03-1 N1 - Arbeitsgemeinschaft Ökologischer Forschungsinstitute ; Fachkongress der Arbeitsgemeinschaft Ökologischer Forschungsinstitute (AGÖF) ; (6 : ; 2001.09.20-21 : ; Nürnberg) SP - 134 EP - 148 PB - AGÖF CY - Springe-Eldagsen 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 - http://dx.doi.org/10.1115/1.1565087 SN - 1528-8986 VL - 125 IS - 2 SP - 170 EP - 176 ER - TY - JOUR A1 - Buck, H. A1 - Schwarzer, Klemens A1 - Meliß, Michael A1 - Faber, Christian T1 - Aus- und Weiterbildung am Solar-Institut Jülich JF - Energiewirtschaftliche Tagesfragen. 44 (1994), H. 9 Y1 - 1994 SN - 0720-6240 SP - 65 EP - 68 ER - TY - JOUR A1 - Buck, H. A1 - Faber, Christian A1 - Meliß, Michael A1 - Schwarzer, Klemens T1 - Aus- und Weiterbildung am Solar-Institut Jülich JF - Energie für die Zukunft : 28. Juni bis 1. Juli 1994 ; [Tagungsbericht 2] / 9. Internationales Sonnenforum '94. [Hrsg. Deutsche Gesellschaft für Sonnenenergie e.V. - DGS. Red. A. Hohmann ; H. H. Hohmann]. - (Internationales Sonnenforum ; 9,2) Y1 - 1995 N1 - Internationales Sonnenforum <9, 1994, Stuttgart> ; Deutsche Gesellschaft für Sonnenenergie SP - 1779 EP - 1785 PB - DGS-Sonnenenergie CY - München ER - TY - JOUR A1 - Gorzalka, Philip A1 - Schmiedt, Jacob Estevam A1 - Schorn, Christian T1 - Automated Generation of an Energy Simulation Model for an Existing Building from UAV Imagery JF - Buildings N2 - An approach to automatically generate a dynamic energy simulation model in Modelica for a single existing building is presented. It aims at collecting data about the status quo in the preparation of energy retrofits with low effort and costs. The proposed method starts from a polygon model of the outer building envelope obtained from photogrammetrically generated point clouds. The open-source tools TEASER and AixLib are used for data enrichment and model generation. A case study was conducted on a single-family house. The resulting model can accurately reproduce the internal air temperatures during synthetical heating up and cooling down. Modelled and measured whole building heat transfer coefficients (HTC) agree within a 12% range. A sensitivity analysis emphasises the importance of accurate window characterisations and justifies the use of a very simplified interior geometry. Uncertainties arising from the use of archetype U-values are estimated by comparing different typologies, with best- and worst-case estimates showing differences in pre-retrofit heat demand of about ±20% to the average; however, as the assumptions made are permitted by some national standards, the method is already close to practical applicability and opens up a path to quickly estimate possible financial and energy savings after refurbishment. KW - Modelica KW - heat transfer coefficient KW - heat demand KW - building energy modelling KW - building energy simulation Y1 - 2021 U6 - http://dx.doi.org/10.3390/buildings11090380 SN - 2075-5309 N1 - This article belongs to the Special Issue "Application of Computer Technology in Buildings" VL - 11 IS - 9 PB - MDPI CY - Basel ER - TY - JOUR A1 - Alexopoulos, Spiros T1 - Biogas systems: basics, biogas multifunction, principle of fermentation and hybrid application with a solar tower for the treatment of waste animal manure JF - Journal of Engineering Science and Technology Review N2 - Two of the main environmental problems of today’s society are the continuously increasing production of organic wastes as well as the increase of carbon dioxide in the atmosphere and the related green house effect. A way to solve these problems is the production of biogas. Biogas is a combustible gas consisting of methane, carbon dioxide and small amounts of other gases and trace elements. Production of biogas through anaerobic digestion of animal manure and slurries as well as of a wide range of digestible organic wastes and agricultural residues, converts these substrates into electricity and heat and offers a natural fertiliser for agriculture. The microbiological process of decomposition of organic matter, in the absence of oxygen takes place in reactors, called digesters. Biogas can be used as a fuel in a gas turbine or burner and can be used in a hybrid solar tower system offering a solution for waste treatment of agricultural and animal residues. A solar tower system consists of a heliostat field, which concentrates direct solar irradiation on an open volumetric central receiver. The receiver heats up ambient air to temperatures of around 700°C. The hot air’s heat energy is transferred to a steam Rankine cycle in a heat recovery steam generator (HRSG). The steam drives a steam turbine, which in turn drives a generator for producing electricity. In order to increase the operational hours of a solar tower power plant, a heat storage system and/ or hybridization may be considered. The advantage of solar-fossil hybrid power plants, compared to solar-only systems, lies in low additional investment costs due to an adaptable solar share and reduced technical and economical risks. On sunny days the hybrid system operates in a solar-only mode with the central receiver and on cloudy days and at night with the gas turbine only. As an alternative to methane gas, environmentally neutral biogas can be used for operating the gas turbine. Hence, the hybrid system is operated to 100% from renewable energy sources Y1 - 2012 SN - 1791-2377 N1 - Special Issue on Renewable Energy Systems VL - 5 IS - 4 SP - 48 EP - 55 ER - TY - JOUR A1 - Meliß, Michael A1 - Selzer, H. A1 - Ziesing, H. J. T1 - CO2-Reduktionspotentiale erneuerbarer Energiequellen JF - Energiewirtschaftliche Tagesfragen. Jg. 41 (1991), H. 5 Y1 - 1991 SN - 0013-743X ; 0720-6240 SP - 291 EP - 299 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 - http://dx.doi.org/10.1016/j.energy.2017.06.025 VL - 137 SP - 715 EP - 728 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Meliß, Michael A1 - Sandtner, W. T1 - Der Forschungsstand bei den regenerativen Energiequellen JF - Energiewirtschaftliche Tagesfragen. Jg. 46 (1996), H. 1/2 Y1 - 1996 SN - 0720-6240 SP - 14 EP - 23 ER - TY - JOUR A1 - Kroker, J. A1 - Faber, Christian A1 - Trinkl, C. A1 - Zörner, W. T1 - Der Garten bleibt - solares Heizen mit Wärmepumpe und Latentwärmespeicher verzichtet auf großflächige Erdwärmetauscher JF - Erneuerbare Energien : das Magazin. 18 (2008), H. 8 Y1 - 2008 SN - 1436-8773 SP - 46 EP - 49 ER - TY - JOUR A1 - Göttsche, Joachim T1 - Der vertikale Sonnenlichtquotient : Eine wichtige Kenngröße zur Charakterisierung von Lichtlenksystemen / Göttsche, Joachim JF - Elftes Symposium Innovative Lichttechnik in Gebäuden : 27./28. Januar 2005, [Kloster Banz] / OTTI-Kolleg Beratung, Projekte Y1 - 2005 SN - 3934681379 N1 - Symposium Innovative Lichttechnik in Gebäuden ; (11, 2005, Kloster Banz) SP - 79 EP - 84 PB - Ostbayerisches Technologie-Transfer-Inst., OTTI CY - Regensburg ER - TY - JOUR A1 - Stein, H. A1 - Meliß, Michael T1 - Die Bedeutung der Sonnenenergie für die zukünftige Energieversorgung der Bundesrepublik Deutschland JF - Din-Mitteilungen + Elektronorm. Bd. 59 (1980), H. 8 Y1 - 1980 SN - 0722-2912 SP - 434 EP - 440 ER - TY - JOUR A1 - Herrmann, Ulf A1 - Nava, P. T1 - Die Strahlung der Sonne einfangen JF - DLR-Nachrichten / Deutsches Zentrum für Luft- und Raumfahrt Y1 - 2005 SN - 0937-0420 VL - 109 IS - Sonderheft Solarforschung SP - 34 EP - 37 ER - TY - JOUR A1 - Göttsche, Joachim A1 - Schwarzer, Klemens A1 - Röther, S. A1 - Jellinghaus, Sabine T1 - Efficient daylighting, heating and shading with rooflight heliostats JF - Conference Internationale Energie Solaire et Batiment Y1 - 2009 SP - 243 EP - 248 PB - EPFL CY - Lausanne ER - TY - JOUR A1 - Göttsche, Joachim T1 - Eldorado summer schools JF - Progress in solar energy education. 3 (1994) Y1 - 1994 SN - 1018-5607 SP - 31 EP - 33 ER -