Abstract

BORRAJO-PEREZ, Rubén et al. A parametric analysis of a dual channel solar air collector working in forced flow regime. Ingeniería Mecánica [online]. 2023, vol.26, n.2, pp. 46-54.  Epub Feb 10, 2024. ISSN 1815-5944.

Air solar collectors are employed frequently in heating and drying process. The most distributed model is probably the flat solar collector. The model consists of a flat plate receiving directly the solar radiation passing through a glazing top surface. When the air flow through two separated channels, the absorber plate is located in between them. Numerical modelling allows to study the performance of multiples geometric configurations, avoiding expensive experiments. The objective of this research is to determine the best location for the plate located inside the channel of an air solar collector. The numerical study is carried on inside the turbulent flow regime and eleven different positions for the plate were modeled. When the thermohydraulic behavior is considered, the configuration with the best performance was the named 35-45. The configuration presented both, the higher effective thermal efficiency and exergetic efficiency. An effective thermal efficiency value about 85.75 % was reached by the 35-45 configuration under a solar energy radiation of 800 W/m2. The heat losses from the cover and from the bottom are responsible by the final outcomes.

Keywords : solar air collector; dual channel; computational flow dynamics; renewable energy.

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