AbdallaGomaa, Fifi N. M. Elwekeel, Mahmoud Abdelmagied, and Momen I. Radwan. 2020. “Performance Investigation of Evacuated Tube Collector Using Different Nano Fluids Applied to Winter Climatic Conditions in Egypt”. International Journal of Advances in Scientific Research and Engineering (IJASRE), ISSN:2454-8006, DOI: 10.31695/IJASRE 6 (1):156-68. https://doi.org/10.31695/IJASRE.2020.33698.