Abstract
Transpired solar collectors (TSC) are one of the most popular solar thermal technologies for building façades. TSC use solar energy to heat the absorber surface, which transmits thermal energy to the ambient air. A variant of TSC, namely, a double skin transpired solar collector (DSTSC), has been analyzed in this paper, thus providing guide values and a technical point of view for engineers, architects, and constructors when designing such transpired solar collectors. Three important parameters were addressed in this study through numerical simulation: the influence of a separation plate introduced in a TSC, turning it into a DSTSC; the air layer thickness influence on the performance of the collector; and the influence of the used absorber materials for the separation plate material. Greater heat exchange efficiency was noticed for the DSTSC at every imposed airflow rate compared with the TSC. Regarding the thickness of the collector, the efficiency gradually increased when increasing the solar collector thickness until it reached a value of 20 cm, though not varying significantly at a thickness of 30 cm.
Highlights
A great recent challenge has been to reach world climate-neutrality by 2050, and at this moment, with the buildings sector still being responsible for 40% of greenhouse gas emissions and 36% of final global energy consumption, it is clear that perspectives must change [1]
This paper presents numerical studies performed on a large-scale numerical model, regarding the parametric independence of a Double Skin Transpired Solar Collector (DSTSC)
A novel double skin transpired solar collector was analyzed via Computational Fluid Dynamics (CFD) simulations aiming to determine the thermal behaviour and performance of such a system, providing guiding values and a technical point of view for engineers, architects, and constructors when designing such transpired solar collectors
Summary
A great recent challenge has been to reach world climate-neutrality by 2050, and at this moment, with the buildings sector still being responsible for 40% of greenhouse gas emissions and 36% of final global energy consumption, it is clear that perspectives must change [1]. For the construction of skyscrapers during the 20th century, architects and building designers focused on high-rise buildings made of concrete and metal structures wrapped in glass façades. These shiny and high-energy-consumption buildings are no longer in accordance with the standards and needs of our times. Strict energy requirements are emerging around the world, making buildings and energy systems more efficient and sustainable. To work towards a successful energy transition, a new energy system must be proposed, and the architecture of buildings must be thought of in a more sustainable way. The energy-efficient solutions can be embedded in the building structure, and from these, our attention is focused on the building envelope/façade. The building envelope has the capacity to capture large amounts of free energy from the sun [3]
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