Low-energy building insulation through external wall modification: a case study on Lanzhou Academy of Painting in China

Abstract

Abstract This study analyzes the external wall insulation of Lanzhou Academy of Painting, China, clarifies the thermal storage performance and characteristics of insulation materials according to local conditions, and proposes an insulation technique that combines external insulation of external walls with a double-skin façade. Based on the characteristics of passive low-energy buildings, the passive façade design with high-performance insulation materials was selected according to local conditions. The insulation performance of such buildings is studied under the conditions of no thermal bridge, high air tightness, waterproof and vapor isolation, and a sunlight shield. Our findings can promote the implementation of passive ultra-low energy-consumption designs in China. Based on the design of double outer skin, the use of thermal insulation and environmental protection materials as well as the control of air flow rate is used to improve the thermal insulation performance of the wall, through the computer simulation to compare the new design of the outer skin to Lanzhou Painting Academy as a pilot. It is proved that the composite double outer surface can be used in a large area of public buildings in cold regions. The low energy consumption double composite exterior skin designed in this article can be adjusted through its own air inlet and outlet size, the reasonable use of natural conditions to achieve the effect of heat preservation and heat dissipation. Through the simulation of the spectral diagram to compare the traditional outer skin and the innovative double skin heat storage performance differences, the simulation shows that the traditional thermal insulation outer skin heat storage capacity is uniform and need to be combined with other devices to achieve indoor thermal insulation, double skin through its own regulation using the control of air convection combined with the new thermal insulation materials to achieve lower energy consumption, heat storage effect is better. In order to compare the effect, the Swire room temperature simulation is carried out using the design of local double-layer exterior and traditional outer skin splicing, and the difference in spectral performance of the two types of walls is obtained intuitively. The use of double skin can regulate the heat storage capacity of the wall to directly affect the room temperature, which can be used in large public buildings in cold regions of China to achieve energy saving and carbon reduction.