3.3 AHP analysis
The weights of the secondary indicators were calculated by (2), (3) and (4) above and integrated to form Table 3. The weights of ”energy use”, ”envelope” and ”economic factors” are larger, 0.364, 0.245 and 0.195 respectively, while the weights of ”layout design”, ”building materials” and ”behavior” are less. Among the secondary indicators, the top five ranked by weight are ”clean energy utilization” (0.152), ”external wall insulation system” (0.090) and ”energy efficiency” (0.152). ”(0.090), ”window performance” (0.088), and ”electricity consumption” (0.084), accounting for more than half of the total weight, which is an important influence on the clean energy use of rural residential buildings. The factors of clean energy use in rural residential buildings are important factors. Most of the indicators with lower weights are ”behavior”, ”building materials” and ”layout design”, mainly because these influencing factors are influenced by the geographical environment and the original status of the building. For example, the ”appropriateness of site selection” in the secondary index is determined at the beginning of building construction, so it is difficult to change it again during renovation, but it affects the energy source and its distribution during the operation and use of the building, which has a significant impact on the LCI. However, it affects the energy resources and their distribution during the operation phase of the building, and has a significant impact on LCI. From the above analysis, it is clear that ”energy use”, ”envelope” and ”economic factors” are important influencing factors in the assessment of clean and low carbon use of rural residential buildings [21].
Table 3 I and II index weights