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 - https://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 - RPRT A1 - Esch, Thomas A1 - Damm, Marc André A1 - Kalbhenn, Hartmut T1 - Auslegung und Simulation eines Hybridantriebs für den teilelektrischen Betrieb eines Luftfahrzeuges der allgemeinen Luftfahrt : Schlussbericht für das Forschungsvorhaben ; Förderperiode 01.07.2009 - 31.05.2012 T1 - HyFly ; Design and simulation of a partially electrified operatin of an aircraft of the general aviation Y1 - 2013 U6 - https://doi.org/10.2314/GBV:780055411 N1 - Report-Nr.: 1709X08 CY - Aachen ; Hannover ER - TY - THES A1 - Herrmann, Ulf T1 - Untersuchungen zur Rohrwandbenetzung bei der Dampferzeugung in horizontalen und geneigten Parabolrinnen-Solarkollektoren. - (FLAGSOL Forschungsbericht) Y1 - 2004 SN - 3-9804901-2-2 N1 - Zugl.: Aachen, Techn. Hochsch., Diss., 2004 PB - FLAGSOL CY - Köln ER - TY - CHAP A1 - Kelly, Bruce A1 - Herrmann, Ulf A1 - Hale, M.-J. T1 - Optimization Studies for Integrated Solar Combined Cycle Systems T2 - Solar engineering 2001 : proceedings of the International Solar Energy Conference ; presented at the 2001 International Solar Energy Conference, a part of Forum 2001 - Solar energy: the power to choose, April 21 - 25, 2001, Washington, D.C. Y1 - 2001 SN - 0-7918-1670-2 N1 - International Solar Energy Conference SP - 393 EP - 398 PB - ASME CY - New York, NY ER - TY - CHAP A1 - Anthrakidis, Anette T1 - Schnelltest zur Abschätzung der Wirkungsgradkennlinie von Parabolrinnenkollektoren T2 - Thermische Solarenergie : 20. Symposium ; 05. bis 07. Mai 2010, Kloster Banz, Bad Staffelstein Y1 - 2010 SN - 978-3-941785-29-8 SP - 112 EP - 117 PB - OTTI CY - Regensburg ER - TY - CHAP A1 - Alexopoulos, Spiros A1 - Hoffschmidt, Bernhard A1 - Rau, Christoph A1 - Sattler, Johannes Christoph T1 - Simulation of hybrid solar tower power plants T2 - 30th ISES Biennial Solar World Congress 2011 : Kassel, Germany, 28 August - 2 September 2011. Vol. 5 Y1 - 2012 SP - 4044 EP - 4050 PB - Curran CY - Red Hook, NY ER - 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 - BOOK A1 - Göttsche, Joachim T1 - Eine Maximum-Likelihood-Methode zur Charakterisierung fraktaler Mengen und chaotischer dynamische Prozesse/ vorgelegt von Joachim Göttsche Y1 - 1989 N1 - Univ., Diplomarbeit--Kiel, 1989 PB - Inst. für Theoretische Physik und Sternwarte der Christian-Albrechts-Univ. CY - Kiel 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 - TY - CHAP A1 - Mohan, Nijanthan A1 - Groß, Rolf Fritz A1 - Menzel, Karsten A1 - Theis, Fabian T1 - Opportunities and Challenges in the Implementation of Building Information Modeling for Prefabrication of Heating, Ventilation and Air Conditioning Systems in Small and Medium-Sized Contracting Companies in Germany – A Case Study T2 - WIT Transactions on The Built Environment, Vol. 205 N2 - Even though BIM (Building Information Modelling) is successfully implemented in most of the world, it is still in the early stages in Germany, since the stakeholders are sceptical of its reliability and efficiency. The purpose of this paper is to analyse the opportunities and obstacles to implementing BIM for prefabrication. Among all other advantages of BIM, prefabrication is chosen for this paper because it plays a vital role in creating an impact on the time and cost factors of a construction project. The project stakeholders and participants can explicitly observe the positive impact of prefabrication, which enables the breakthrough of the scepticism factor among the small-scale construction companies. The analysis consists of the development of a process workflow for implementing prefabrication in building construction followed by a practical approach, which was executed with two case studies. It was planned in such a way that, the first case study gives a first-hand experience for the workers at the site on the BIM model so that they can make much use of the created BIM model, which is a better representation compared to the traditional 2D plan. The main aim of the first case study is to create a belief in the implementation of BIM Models, which was succeeded by the execution of offshore prefabrication in the second case study. Based on the case studies, the time analysis was made and it is inferred that the implementation of BIM for prefabrication can reduce construction time, ensures minimal wastes, better accuracy, less problem-solving at the construction site. It was observed that this process requires more planning time, better communication between different disciplines, which was the major obstacle for successful implementation. This paper was carried out from the perspective of small and medium-sized mechanical contracting companies for the private building sector in Germany. KW - building information modelling KW - HVAC KW - prefabrication KW - construction KW - small and medium scaled companies Y1 - 2021 U6 - https://doi.org/10.2495/BIM210101 SN - 1743-3509 N1 - 4th International Conference on Building Information Modelling (BIM) in Design, Construction and Operations, 1–3 September 2021. Santiago de Compostela, Spain SP - 117 EP - 126 PB - WIT Press CY - Southampton ER -