基于ANSYS软件秸秆生态夹芯复合外挂墙板热工性能研究

Study on thermal performance of straw ecological sandwich composite external wall panel based on ANSYS software

研究了秸秆纤维与硅藻土、粉煤灰协同作用对秸秆生态夹芯复合外挂墙板导热系数的影响,得出秸秆纤维碳化处理的最佳方式。通过ANSYS有限元分析软件对秸秆墙板进行热工性能数值模拟,分析不同内外叶墙板厚度及EPS保温板厚度对秸秆墙板热工性能的影响。结果表明:随着秸秆纤维掺量的增加,秸秆墙板导热系数逐渐减小,秸秆纤维碳化的最佳温度为240℃,最佳时间为20 min;内外叶墙板厚度对传热系数的影响不明显,EPS保温板厚度对传热系数的影响显著,当EPS保温层板厚为120 mm时,传热系数为0.264 W/(m^(2)·K),完全满足吉林地区农村居住建筑节能75%的要求。

The synergistic effect of straw fiber,diatomite and fly ash on thermal conductivity was studied,and the best way of straw fiber carbonization treatment was obtained.Using finite element analysis software ANSYS,the thermal performance numerical simulation was carried out to analyze the influence of different internal and external leaf wallboard thickness and EPS insulation board thickness on the thermal performance of straw ecological sandwich composite wallboard.The results show that with the increase of straw fiber content,the thermal conductivity of straw fiberdecreases gradually,the optimum temperature and time of straw fiber carbonization are 240℃ and 20 min.The influence of inside and outside leaf wall thickness on the heat transfer coefficient is not obvious,the influence of EPS insulation board thickness on the heat transfer coefficient is significant,and when the EPS thermal insulation layer thickness is 120 mm,the heat transfer coefficient is 0.264 W/(m^(2)·K),fully meet the rural residential building energy saving in Jilin area(75%).