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Environmental and Economic Optimisation of Single-Family Buildings Thermomodernisation
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Environmental and Economic Optimisation of Single-Family Buildings Thermomodernisation
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Journal Article
Environmental and Economic Optimisation of Single-Family Buildings Thermomodernisation
2025
Overview
This study offers a detailed environmental, energy, and economic evaluation of thermal modernisation options for an existing single-family home in southern Poland. A total of 24 variants, combining different heat sources (solid fuel, biomass, natural gas, and heat pumps) with various levels of building insulation, were analysed using energy performance certification methods. Results show that, from an energy perspective, the most advantageous scenarios are those utilising brine-to-water or air-to-water heat pumps supported by photovoltaic systems, reaching final energy demands as low as 43.5 kWh/m2year and primary energy demands of 41.1 kWh/m2year. Biomass boilers coupled with solar collectors delivered the highest renewable energy share (up to 99.2%); however, they resulted in less notable reductions in primary energy. Environmentally, all heat pump options removed local particulate emissions, with CO2 reductions of up to 87.5% compared to the baseline; biomass systems attained 100% CO2 reduction owing to renewable fuels. Economically, biomass boilers had the lowest unit energy production costs, while PV-assisted heat pumps faced the highest overall costs despite their superior environmental benefits. The findings highlight the trade-offs between ecological advantages, energy efficiency, and investment costs, offering a decision-making framework for the modernisation of sustainable residential heating systems.
