The building envelope (walls, roofs, windows, etc.) is the first line of defense against energy loss. Statistics show that heat loss through the building envelope accounts for 30%-50% of total building energy consumption. Therefore, scientific monitoring and assessment of envelope thermal performance is a critical step toward building energy efficiency. Why Monitor Building Envelope Thermal Performance? The thermal performance of the building envelope directly affects indoor thermal comfort and HVAC loads. Poor performance can lead to significant heat loss in winter, heat infiltration in summer, large indoor temperature fluctuations, and increased condensation risk. Key Monitoring Parameters Thermal Transmittance (U-value): Represents the heat flow per unit area through the envelope when there is a 1K temperature difference. Field testing methods include the Heat Flow Meter Method and Infrared Thermography. Thermal Inertia Index (D-value): Reflects the envelope's ability to resist temperature fluctuations. High thermal inertia means more stable indoor temperatures and reduced peak HVAC loads. Air Tightness: The air tightness of windows and curtain walls directly affects infiltration heat loss. The Blower Door Test can quantify the overall building air tightness level. Sensor Deployment Scheme Monitoring locations include inner/outer wall surfaces (surface-mount temperature sensors), wall center (heat flux sensor), window frames/glass (infrared temperature sensors), and building perimeter (weather station). Data Analysis and Assessment By comparing measured U-value with design U-value, actual energy-saving effects can be evaluated: Energy Saving Rate = (1 - U_measured/U_design) × 100%. Case Study An office building was designed with a wall U-value of 0.45 W/(m²·K), but the measured value was 0.62 W/(m²·K), exceeding the design by 37.8%. After remediation, the measured U-value dropped to 0.48 W/(m²·K), saving approximately 12,000 kWh annually. Conclusion Building envelope thermal performance monitoring is fundamental to energy-efficient building management. Under the "dual carbon" goals, this work will become increasingly important.

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