1. a Mech. Power Eng. Dept., Faculty of Eng., Mattarria , Helwan University , 11718 , Cairo , Egypt Phone: Fax:
2. b Solar Energy Department , National Research Centre , El-Tahrir St., Dokki , Giza , Egypt
3. c Water Pollution Research Department , National Research Centre , El-Tahrir St., Dokki , Giza , Egypt