Study on the heat and moisture transfer characteristics of aerogel-enhanced foam concrete precast wall panels and the influence of building energy consumption

Abstract

The novel building materials continue to emerge, but there is not enough research on their performance. To explore the hygrothermal characteristics of the aerogel-enhanced foam precast concrete wall panels, a mathematical model was established and verified by experiments. The heat and moisture transfer performance parameters were tested by experiments, and the functional relations of related parameters have been fitted. Two typical cities in China, Shanghai in hot summer and cold winter area (HSCW) and Beijing in cold area (CA) were taken as examples. The hygrothermal characteristics of wall panels were numerically calculated for 5 years. The results show that the internal temperature and humidity of the wall panels in the two regions showed irregular periodic changes. The heating and cooling loads of the wall panel were calculated by the coupled heat and moisture transfer model and heat transfer model, respectively. Under the conditions of considering the eastward solar radiation and ignoring the radiation, the comparison of the results of the same model shows that the cooling load deviation in Shanghai is more than 55%, while the deviation in Beijing is as high as 62.4%. While the maximum deviation of the heating load between the two areas is only about 9.5%. Secondly, the results of the two models under the same working conditions are compared, and the maximum deviation of the cooling load in the two areas is only 11.2%. The maximum heating load deviation is only 4.1%, and the minimum is 1.34%. In addition, the impact of solar radiation on the cooling load in two climate zones far exceeds the heating load, and it has a greater impact on Shanghai.