Abstract: Reducing consumption of primary energy sources and possibilities to reduce the energy demands of buildings using alternative energy sources are nowadays frequently discussed topics. Current research is at the research center "Centre for Research and Utilization of Renewable Energy Sources" (CRURES) focused on the possibility of increasing the efficiency of multivalent energy systems consisting of renewable energy sources. Regarding current needs the research is focused on the possibilities of using these multivalent systems in modern low-energy construction while meeting the energy-economic indicators.
The aim of the lecture is to describe the current situation within the field of alternative energy sources utilization in modern low-energy construction in the Czech Republic and to show the specifics of the power systems design applying such sources. There are presented the results obtained during the solution of several research projects that demonstrate specific features of multivalent energy systems regarding the energy and economic evaluation of its operation.

Brief Biography of the Speaker:
Petr Mastny was born in 1976. He graduated in Electrical Power engineering in 2000 from Brno University of Technology. His Ph.D. he obtained in October 2006. In December 2010 he has been appointed as Associate Professor at Brno University of Technology.
He has been with Department of Electrical Power Engineering, Brno University of Technology, Czech Republic since 2005 and with Centre of Research and Utilization of Renewable Energy since 2010. His current position is assistant professor. His field of interest covers the problems of utilization of renewable energy source and questions of energy management systems with renewable energy sources and their influence on environment. At present he is head worker or co-worker of five research projects in the field of Alternative Power Sources and he cooperates with several private companies to solve of real applications.
Petr Mastny has been member of WSEAS (The World Scientific and Engineering Academy and Society) since 2007, member of NAUN since 2009, member of IEEAM since 2010 and member of CIRED since 2009. He is author of about 70 publications in international scientific journals and conferences in field of Power Engineering and Alternative Power Sources. He has more than 50 presentations in international conferences and technical seminars and he has more than 10 citations in international scientific journals.