Semi-transparent roof structures, such as glass or polycarbonate canopies, are increasingly used in modern architecture to maximize daylighting and aesthetic appeal. While they offer visual and comfort benefits, they introduce complexities in EPC (Energy Performance Certificate) assessments, primarily due to radiative heat transfer. Accurately modeling how solar radiation enters, transmits, and is absorbed is crucial for realistic energy performance ratings.
Key Considerations for EPC Assessment:
Variable Solar Heat Gain – Semi-transparent materials allow direct and diffuse sunlight into interior spaces, impacting heating and cooling loads. EPC software must account for the dynamic nature of solar gain throughout the day and year.
Thermal Bridging and Surface Temperatures – Radiative heat transfer affects roof surface temperatures, which influences internal thermal comfort and HVAC energy demand.
Interaction with Shading and Interior Finishes – Interior surfaces and shading systems alter how radiation is absorbed or reflected, impacting the building’s overall energy performance.
Calibration with Measured Data – For high-accuracy EPC ratings, actual thermal and daylight measurements help validate predictive models.
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