Institute of Energy Systems and Environment, Researcher Riga Technical University, Kronvalda boulv.1, LV-1010, Riga, Latvia
K. Valters
Faculty of Power and Electrical Engineering Institute of Energy Systems and Environment, Riga Technical University, Kronvalda boulv.1, LV-1010, Riga, Latvia
G. Bažbauers
Institute of Energy Systems and Environment, Riga Technical University, Kronvalda boulv.1, LV-1010, Riga, Latvia