**Acknowledgements**

This work was supported by the following grants of the Romanian Ministry of Research and Innovation, CCCDI–UEFISCDI: project number PN-III-P1-1.2-PCCDI-2017-0391 / CIA\_CLIM - Smart buildings adaptable to the climate change effects, and project number PN-III-P1-1.2-PCCDI-2017-0254/ SMARTIRRIG - Innovative technologies for irrigation of agricultural crops in arid, semiarid and subhumid-dry climate, within PNCDIIII. The work was also financially supported by ANCSI, Romania, under the scientific Programme NUCLEU 2009-2015, Contract PN 09350201.

Moreover, I would like to thank Professor Nicolae Golovanov for his expert advice and also my colleague from the National Institute for Research and Development in Electrical Engineering ICPE-CA, Bucharest, Romania, Dr. Adrian Nedelcu, who provided the simulation insight and expertise that greatly assisted the research.
