Simulation study on light environment performance and heat gain of applying a bimetal automatic shading device to rooms

摘要

Excess sunlight entering the room in buildings with a large proportion of transparent outer building envelopes may easily make people feel uncomfortable and cause excess heat loads to the buildings, thus resulting in high operating costs and high investment of those buildings. In response to the above issue, a bimetal automatic shading device was proposed in this paper based on thermal effect of solar radiation, which implements the shading mechanism through the variation of the bending angle of heated bimetal, as the bending angle of the bimetal is related to temperature. According to the findings, the bimetal automatic shading device can play a role in automatically adjusting solar radiation entering the room. The indoor temperature of a room with the device applied in summer of Beijing can be lowered. Based on simulation calculation results, the indoor heat gain can be reduced by about 58% in summer and 1.53% in winter, showing its effective application in Beijing. The optimization study shows that the optimal length-to-height ratio and the optimal specific thermal deflection of the bimetal automatic shading device in actual use are 0.9 and 20.5 +/- 5% x10-6 degrees C-1, respectively. (c) 2020 Elsevier B.V. All rights reserved.