Abstract
An important trend of Building Integrated Solar Thermal (BIST) system is to improve the aesthetic aspect of the solar collector to meet the requirement of architectural style and energy collection. Painting on the glass cover in an appropriate method is a simple and practical way. In this study, a halftone coating was used to print a red brick wall pattern on the glass cover. A series of comparative experiments were carried out to test the effect of the coating on the thermal behavior of the solar collector. In heat collection processes, compared with the solar collector with blank cover plate, the one with coated cover plate has lower absorber plate temperature and higher cover plate temperature. The lower the solar irradiance, the smaller the effect of color coating on the solar collector. Compared with the uncoated surface, the coated surface is more sensitive to solar irradiation. In the same heat collection process, compared with the solar collector coated on the outer surface of the cover plate, the one coated on the inner surface has 0.8 °C higher heat absorber plate temperature and 5% lower top heat loss.
Highlights
The utilization of renewable energy is one of the effective ways to solve the environmental problems caused by the high energy consumption of buildings [1]
(2) The coating has a smaller effect on the solar collector under low solar irradiance
The effect solar irradiance on the coated surface temperature of the cover plate is stronger than the effect on the of solar irradiance on the coated surface temperature of the cover plate is stronger than the effect on uncoated surface temperature
Summary
The utilization of renewable energy is one of the effective ways to solve the environmental problems caused by the high energy consumption of buildings [1]. Solar energy is a kind of renewable energy suitable for buildings due to its unlimited reserves and sustainability [2]. Solar collectors and hybrid photovoltaic–thermal (PV/T) [6] solar systems are all used on buildings. Building energy consumption mainly comes from maintaining indoor thermal comfort and providing domestic hot water, whereas solar thermal utilization can be effectively used to provide space heating and domestic hot water. The combination of solar collectors and buildings is a key issue that is related to energy collection and utilization, indoor thermal environment, urban style, and rural landscape [8]
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