Hybrid ventilation systems, combining mechanical and passive airflow strategies, are increasingly used to optimize indoor air quality and energy efficiency. However, incorporating seasonal variation into Energy Performance Certificate (EPC) assessments can be complex, as both natural and mechanical airflow contribute variably to the building’s thermal balance.
Key Challenges in EPC Modelling:
Seasonal Airflow Dynamics – Passive ventilation depends on outdoor temperature, wind patterns, and building orientation. Seasonal changes can significantly affect the efficiency of hybrid systems, making accurate EPC predictions challenging.
Interaction Between Mechanical and Passive Systems – Mechanical ventilation may override passive airflow under certain conditions. Modeling these interactions correctly is essential to avoid overestimating energy performance.
Data Requirements – EPC software requires detailed input on system capacities, operational schedules, control strategies, and seasonal variations in climate data. Incomplete data may introduce errors in EPC ratings.
Software Limitations – Standard EPC tools may not fully capture hybrid ventilation behavior, especially with dynamic seasonal adjustments, necessitating advanced simulation or expert calibration.
Strategies for Accurate EPC Assessment:
Advanced Simulation Tools – Use software that can model hybrid ventilation systems with variable seasonal performance.
Calibration with Real-World Data – Incorporate measured airflow rates, temperature fluctuations, and system operation to refine EPC predictions.
Engage Expert Assessors – Certified EPC assessors experienced with hybrid ventilation systems can ensure accurate ratings.
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