Based on numerical simulation,the characterisation law is investigated for a wall with missing external wall insulation under different indoor-outdoor temperature differences and external wind speed.The relative area of the defective area and the increase ratio of the energy consumption in the defective area specified in the standard are selected as the characterisation indices,while the relative area of the temperature anomaly area and the increase ratio of the energy consumption in the wall are proposed as new characterisation indices to characterise the thermal defects from the inside of the wall and the outside of the wall.By analysing the differences in temperature distribution and heat transfer calculation methods for defective wall faces,the reasons for the differences in characterising the different types of indicators in different environments are explored.The results show that due to the simplified calculation of the defect area division and the energy consumption increase ratio in the current stage of the standard,the results of characterising the same defect in different environments vary widely,with the variation of the relative area of the defect area on the outer surface and the energy consumption increase ratio of the defect area on the inner surface being 2.5%and 6.6%,which cannot accurately characterise the thermal defects.The relative area of the temperature anomaly region on the defective side and the increase ratio of the wall energy consumption are more stable in different environments,which is suitable for the characterisation of thermal defects.
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