This research focuses on the numerical simulation and performance analysis of evacuated tube solar collectors (ETSCs) for their application in heating systems. Evacuated tube solar collectors are widely regarded as one of the most efficient solar thermal technologies due to their superior insulation properties and ability to capture solar energy effectively in a variety of environmental conditions. In this study, a detailed numerical model is developed to simulate the heat transfer processes within the evacuated tube collectors, including convection, conduction, and radiation. The model is validated against experimental data from existing literature to ensure its accuracy and reliability. The primary objective of this research is to assess the thermal performance of ETSCs under various operational conditions, including different fluid types, flow rates, and ambient temperatures. The simulation results provide insights into the heat absorption efficiency, thermal loss characteristics, and overall system performance. Key performance indicators such as collector efficiency, heat transfer rates, and temperature profiles are analyzed for various design parameters.
Saxena et al. (2025) studied this question.