High-rise buildings with atrium spaces often use intermittent passive ventilation to enhance indoor air quality while reducing energy consumption. These systems leverage natural forces such as buoyancy and wind to facilitate airflow without continuous mechanical support. Accurately capturing their impact in Energy Performance Certificate (EPC) assessments can be challenging due to the variable nature of passive airflow.
Key EPC Modeling Challenges:
Dynamic Airflow Patterns – Passive ventilation depends on fluctuating environmental factors, making airflow rates highly variable. Traditional EPC software often relies on simplified assumptions that may not capture these dynamics accurately.
Integration with Mechanical HVAC Systems – The interaction between intermittent passive ventilation and active HVAC systems can affect heating and cooling loads, requiring careful modeling to prevent misrepresentation of energy use.
Data Availability – Accurate EPC assessment requires specific input data, including vent operation schedules, airflow rates, and control strategies, which are often difficult to obtain.
Strategies to Improve EPC Accuracy:
Advanced Simulation Tools – Use software capable of modeling dynamic airflow and passive-mechanical interactions.
Detailed Performance Data – Collect real-world measurements of airflow, occupancy patterns, and vent usage.
Expert Consultation – Engage EPC assessors with experience in passive building systems to ensure realistic modeling.
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