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  - 
TY  - CHAP
A1  - Hoffschmidt, Bernhard
A1  - Telle, R.
A1  - Sauerborn, Markus
A1  - Wagner, M.
T1  - Optical measurement system for high temperature absorbers
T2  - SolarPACES 2011 : concentrating solar power and chemical energy systems : 20 - 23 September, 2011, Granada, Spain
Y1  - 2011
CY  - Granada
ER  - 
TY  - JOUR
A1  - Damm, Marc André
A1  - Sauerborn, Markus
A1  - Fend, Thomas
A1  - Herrmann, Ulf
T1  - Optimisation of a urea selective catalytic reduction system with a coated ceramic mixing element
JF  - Journal of ceramic science and technology
Y1  - 2017
SN  - 2190-9385 (Print)
U6  - https://doi.org/10.4416/JCST2016-00056
SN  - 2190-9385 (Online)
VL  - 8
IS  - 1
SP  - 19
EP  - 24
PB  - Göller
CY  - Baden-Baden
ER  - 
TY  - CHAP
A1  - Alexopoulos, Spiros
A1  - Breitbach, Gerd
A1  - Hoffschmidt, Bernhard
T1  - Optimization of the channel form geometry of porous ReSiC ceramic membrane modules
T2  - Proceedings / International Conference & Exhibition for Filtration and Separation Technology, FILTECH 2009 : October 13 - 15, 2009, Wiesbaden, Germany. Vol. 2
Y1  - 2009
SN  - 978-3-941655-36-2
SP  - 686
EP  - 693
PB  - Filtech Exhibitions Germany
CY  - Meerbusch
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 <Washington, D.C.>
SP  - 393
EP  - 398
PB  - ASME
CY  - New York, NY
ER  - 
TY  - CHAP
A1  - Gall, J.
A1  - Abel, D.
A1  - Ahlbrink, N.
A1  - Andersson, J.
A1  - Diehl, M.
A1  - Pitz-Paal, R.
A1  - Schmitz, M.
A1  - Teixeira Boura, Cristiano José
T1  - Optimized control of hot-gas cycle for solar thermal power plants
T2  - Proceedings of the 7th International Modelica Conference : Como, Italy, 20-22 September 2009 / Francesco Casella, ed.
Y1  - 2009
SN  - 978-91-7393-513-5
SP  - 490
EP  - 495
PB  - The Modelica Association
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  - CHAP
A1  - Herrmann, Ulf
A1  - Graeter, F.
A1  - Nava, P.
ED  - Ramos, C.
T1  - Performance of the SKAL-ET Collector Loop at KJC Operating Company
T2  - 12th International Symposium Solar Power and Chemical Energy Systems, October 6-8, 2004, Oaxaca Mexico ; SolarPACES International Symposium, 12
Y1  - 2004
SN  - 968-6114-18-1
PB  - Instituto de Investigaciones Electricas
CY  - [s.l.]
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  - 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  - CHAP
A1  - Kroker, Jan
A1  - Hoffschmidt, Bernhard
A1  - Schwarzer, Klemens
A1  - Späte, Frank
T1  - PTC 1000 modular parabolic trough collector
T2  - Process heat collectors : state of the art within task 33/IV ; IEA SHC-Task 33 and SolarPACES-Task IV: Solar heat for industrial processes : Förderkennzeichen BMBF 0329273A / Solar Heating and Cooling Executive Committee of the International Energy Agency (IEA) ; ed. Werner Weiss
Y1  - 2008
SP  - 45
EP  - 46
PB  - AEE INTEC
CY  - Gleisdorf
ER  - 
TY  - CHAP
A1  - Meliß, Michael
A1  - Neskakis, A.
A1  - Usbeck, S.
A1  - Vogelsang, E.
A1  - Wagner, L.
A1  - Wiediger, Jürgen
T1  - PV-transmitter and receiver
T2  - Harmony with nature : : proceedings / ISES Solar World Congress, Budapest 1993. International Solar Energy Society, Hungarian Section (H-ISES); Hungarian Solar Energy Society (HSES). Vol. 3: Photovoltaics
Y1  - 1992
SP  - 375
EP  - 380
PB  - Hungarian Energy Society
CY  - Budapest
ER  - 
TY  - BOOK
A1  - Bansal, Narenda K.
A1  - Kleemann, Manfred
A1  - Meliß, Michael
T1  - Renewable energy sources and conversion technology
Y1  - 1990
SN  - 0-07-460023-0
PB  - Tata McGraw-Hill
CY  - New Delhi [u.a.]
ER  - 
TY  - CHAP
A1  - Rendon, Carlos
A1  - Dieckmann, Simon
A1  - Weidle, Mathias
A1  - Dersch, Jürgen
A1  - Teixeira Boura, Cristiano José
A1  - Polklas, Thomas
A1  - Kuschel, Marcus
A1  - Herrmann, Ulf
T1  - Retrofitting of existing parabolic trough collector power plants with molten salt tower systems
T2  - AIP Conference Proceedings
Y1  - 2018
U6  - https://doi.org/10.1063/1.5067030
VL  - 2033
IS  - 1
SP  - 030014-1
EP  - 030014-8
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  - https://doi.org/10.1016/j.solener.2020.06.030
VL  - 207
SP  - 110
EP  - 132
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - CHAP
A1  - Alexopoulos, Spiros
A1  - Kluczka, Sven
A1  - Vaeßen, Christiane
A1  - Roeb, M.
A1  - Neises, M.
T1  - Scenario development for efficient methanol production using CO2 and solar energy
T2  - Eurosun 2012 : Solar energy for a brighter future : conference proceedings : Rijeka, 18.-22.09.2012
Y1  - 2012
SP  - ID 99
CY  - Rijeka
ER  - 
TY  - CHAP
A1  - Gall, J.
A1  - Abel, Dirk
A1  - Ahlbrink, N.
A1  - Pitz-Paal, R.
A1  - Andersson, J.
A1  - Diehl, M.
A1  - Teixeira Boura, Cristiano José
A1  - Schmitz, M.
A1  - Hoffschmidt, Bernhard
T1  - Simulation and control of solar thermal power plants
T2  - International Conference on Renewable Energies and Power Quality : ICREPQ '10 : Granada 23rd - 25th March 2010
Y1  - 2010
SP  - 1
EP  - 5
ER  - 
TY  - CHAP
A1  - Schwarzer, Klemens
A1  - Hafner, B.
A1  - Meer, A. von
A1  - Krings, T.
T1  - Simulation and dimensioning program for solar cookers with temporal heat storage and comparison with measurements
T2  - Harmony with nature : : proceedings / ISES Solar World Congress, Budapest 1993. International Solar Energy Society, Hungarian Section (H-ISES); Hungarian Solar Energy Society (HSES). Bd 5: Active systems
Y1  - 1993
SP  - 473
EP  - 478
PB  - Hungarian Energy Society
CY  - Budapest
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  - JOUR
A1  - Alexopoulos, Spiros
T1  - Simulation model for the transient process behaviour of solar aluminium recycling in a rotary kiln
JF  - Applied Thermal Engineering
Y1  - 2015
U6  - https://doi.org/10.1016/j.applthermaleng.2015.01.007
SN  - 1359-4311
N1  - Autor im Original: Spiridon O. Alexopoulos
VL  - 78
SP  - 387
EP  - 396
PB  - Elsevier
CY  - Amsterdam
ER  -