[1] Tshwane Univ Technol, Dept Mech Engn, ZA-0001 Pretoria, South Africa
[2] Szent Istvan Univ, Dept Mechatron, H-2103 Godollo, Hungary
[3] Budapest Univ Technol & Econ, Dept Energy Engn, H-1111 Budapest, Hungary
[4] Budapest Univ Technol & Econ, Res Grp Tech Analyt Chem Hungarian Acad Sci, H-1111 Budapest, Hungary