Dorji, Cheku, Saran Kumar Gurung, and Prakash Luitel. “The Effect of Tilt Angle Variation on the Performance of the Flat Collector Solar Thermal System (Passive Type)”. Zorig Melong- A Technical Journal of Science, Engineering and Technology 8, no. 1 (June 19, 2023). Accessed November 21, 2024. https://journal.cst.edu.bt/index.php/zm/article/view/45.