egypt renewable energy solar thermal environment clean tech heliopolis university solar energy solar thermal energy sustainable development austrian development agency shw industry giovanna ceglie cooling heating hybridization scenarios conventional thermal power station mohamed salah elsobki khaled gasser introducing seda (solar energy devel ashraf kraidy introducing shamci (solar heater ara finance consukorra axel ceglie-swoboda education cairo university research adel khalil installers vocational education jürgen granditz bfi austria birgit birnstingl sekem energy horst striessnig pink sekem world examples
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