Dorji, cheku, Prakash Luitel, Saran Kumar Gurung, and Tshering Samdrup. 2023. “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 7 (1): 8-11. https://doi.org/10.17102/v8001.