Evaluating the Energy Efficiency of Hollow Precast Walls with Integrated Active Ventilation using the EDGE Certification Framework and Application
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This study evaluates the thermal and energy performance of an Active Double-Layered Precast Wall (ADLP) system for buildings in hot–humid climates using the EDGE (Excellence in Design for Greater Efficiencies) certification framework. While airflow-assisted wall systems can reduce heat transfer and cooling demand, their dynamic thermal behavior cannot be directly represented within the standard EDGE methodology. This study proposes a practical approach for translating airflow-dependent thermal performance into equivalent U-values compatible with EDGE energy assessment. The ADLP system incorporates a hollow cavity with controlled upward airflow to enhance convective heat removal and reduce heat gain through the building envelope. Analytical heat-transfer modeling and transient thermal analysis were used to evaluate wall performance under three airflow conditions: 0 m/s, 0.1 m/s, and 1.0 m/s. The resulting equivalent U-values were then applied within the EDGE App to assess whole-building energy performance for a two-storey residential building in Bangkok, Thailand. Results indicate that the effective wall U-value decreased from 0.590 W/m²·K under the unventilated condition to 0.256 W/m²·K and 0.177 W/m²·K at airflow velocities of 0.1 m/s and 1.0 m/s, respectively. Corresponding annual energy savings increased from 7.23% to 9.35% and 9.85%. The findings suggest that cavity ventilation can improve envelope thermal performance and reduce cooling-energy demand. The study presents a methodology for integrating active wall systems into certification-oriented energy assessments and supports the application of airflow-assisted envelopes in tropical climates.
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