Assessment of Energy Flexibility of Residential Buildings with Phase Change Materials in Uzbekistan Using the Flexibility Evaluation Tool

Uzbekistan's drastically changing continental climate and rapidly rising residential energy consumption mean that structures that have demand-side flexibility to facilitate the incorporation of renewable energy are needed shortly.The present research assesses the energy flexibility of residential buildings augmented with phase change materials (PCMs) utilising the standardised framework of the IEA EBC Annex 67 Flexibility Evaluation Tool (FET).We used dynamic Modelica simulations to get hourly heating and cooling loads for both reference and demand-responsive operation.An orthogonal experimental design (OED) comprising six PCM parameters and five levels was utilised to ascertain the predominant material properties affecting flexibility indicators, such as flexibility efficiency (Eflex), shifted loads (Sflex), peak shaving (PS), ramprate reduction (RR), and cost-weighted savings.The results indicate that PCM density, thickness, and latent heat significantly facilitate long-duration load shifting, but melting temperature predominantly influences peak demand decreases.The results show that better PCM integration greatly increases the flexibility of residential energy use in Uzbekistan, which helps with grid stability and the use of renewable energy.

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