Buildings that integrate mixed renewable energy sources—such as solar PV, wind, and bioenergy—offer significant potential for reducing carbon emissions and energy costs. However, accurately reflecting their performance in Energy Performance Certificate (EPC) ratings can be challenging due to intermittent generation and variability in energy supply.
Key Challenges in EPC Modelling:
Intermittent Energy Production – Renewable systems like solar and wind produce variable outputs depending on weather and time of day. EPC software must account for these fluctuations to avoid overestimating energy efficiency.
System Interaction Effects – Hybrid energy systems often interact with conventional HVAC and mechanical systems. Accurately modeling these interactions is crucial to represent actual energy use.
Storage and Grid Integration – Energy storage solutions and grid feed-in arrangements introduce additional complexity, requiring sophisticated simulation to capture realistic performance.
Data Limitations – EPC assessments depend on accurate input data, such as system capacity, efficiency, and operational schedules. Missing or generalized data can increase modeling uncertainty.
Strategies to Improve Accuracy:
Advanced Simulation Tools – Use software capable of modeling variable renewable generation and hybrid system interactions.
Real-Time Monitoring Data – Incorporate performance data from installed systems to calibrate EPC predictions.
Expert Consultation – Engage EPC assessors experienced in renewable integration to ensure realistic ratings.
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