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Prof. Dr. Andreas Witzig

Prof. Dr. Andreas Witzig

Prof. Dr. Andreas Witzig

ZHAW School of Engineering
Institute of Computational Physics
Technikumstrasse 71
8400 Winterthur

+41 (0) 58 934 45 73

Work at ZHAW


Director of ICP Institute of Computational Physics


Building simulation


  • Founder, CEO, president of the board
    Vela Solaris AG
    12 / 2006 - 08 / 2015
  • Project leader Polysun
    SPF Solar Technology Institute, University of Rapperswil
    03 / 2005 - 12 / 2006
  • Product manager optoelectronics
    Synopsys Inc.
    2004 - 02 / 2005
  • Product manager optoelectronics
    ISE Integrated Systems Engineering
    2002 - 2004
  • Scientific research staff
    Integrated Systems Laboratory
    2002 - 2004


Membership of networks


ETH Medaille
ETH Zurich
01 / 2003

Social media




Articles in scientific journal, peer-reviewed
Book parts, peer-reviewed
Conference contributions, peer-reviewed
Other publications
Oral conference contributions and abstracts

Publications before appointment at the ZHAW

  • E. Vrettos, A. Witzig, R. Kurmann, S. Koch, and G. Andersson, Maximizing local PV utilization using small-scale batteries and flexible thermal loads, European PV Solar Energy Conference and Exhibition (PVSEC), Paris, France, September 2013.
  • R. Bornatico, J. Hüssy, A. Witzig, L. Guzzella, Surrogate modeling of the fast optimization of energy systems, Elsevier journal Energy, vol. 57, June 2013
  • R. Bornatico, M. Pfeiffer, A. Witzig, L. Guzzella, Optimal sizing of a solar thermal building installation using particle swarm optimization, Elsevier journal Energy, vol. 41, issue 1, May 2012
  • A. Witzig, Kombination Solar und Wärmepumpen, Innovative Konzepte in der dezentralen Energieproduktion, Energiepraxis-Bulletin der Ostschweizer Energiefachstellen, Zürich, Oktober 2011
  • A. Witzig, Advances in Optical Device Simulation Software, Photonics Spectra, November 2004
  • A. Witzig, Modeling the Optical Processes in Semiconductor Lasers, PhD Thesis, ETH-Nr. 14694, ISBN 3-89649-803-1, Hartung-Gorre Verlag, Konstanz, 2002