Heat transfer investigation for wall heat loss recapture in transpired solar collectors

Abstract

The significance of the research is underscored by the necessity of energy conservation and sustainable building practices, particularly the optimization of Transpired Solar Collectors (TSCs). The study investigates the multifaceted influence of variables such as airflow rates, thermal performance, and solar radiation on the heat loss recapture capabilities of TSCs. A dual-method approach was employed, incorporating Computational Fluid Dynamics (CFD) simulations and experimental models. This approach provided insights into heat transfer mechanisms and flow regimes, which were critical for understanding variations in thermal efficiency and airflow characteristics within the TSCs. Various scenarios were investigated within the 54–108 m3/(h·m2) fluid domain to understand their impact on TSC performance. Results manifest that optimized airflow rates and solar radiation levels can significantly improve heat loss recapture in TSCs. The mean reduction in wall heat loss recapture, influenced by solar radiation, ranges from 62 % to 219 %, depending on the airflow rate and the thermal performance effect. This research augments the existing body of knowledge by providing an in-depth understanding of the dynamic interplay between these variables, thus paving the way for developing more efficient TSCs.

Keywords

• Building sectors
• Energy-saving
• Dynamic insulation
• Solar air collectors
• Advanced technologies