adminscst, adminscst, C. Dorji, S. Kumar Gurung, and P. 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, vol. 8, no. 1, June 2023, doi:10.17102/v8001.