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Energy efficiency measures and conversion of fossil fuel boiler systems in a detached house

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Abstract

There is a large potential to reduce primary energy use and CO2 emissions from the Swedish building stock. Here detached houses heated by oil, natural gas or electric boilers were assessed. CO2 emissions, primary energy use and heating costs were evaluated before and after implementing house envelope measures, conversions to more efficient heating systems and changes to biomass fuel use. The study included full energy chains, from natural resources to usable heat in the houses. The aim was to evaluate the societal economic cost effectiveness of reducing CO2 emission and primary energy use by different combinations of changes. The results demonstrated that for a house using an electric boiler, a conversion to a heat pump combined with house envelope measures could be cost efficient from a societal economic perspective. If the electricity was based on biomass, the primary energy use was at the same time reduced by 70% and the CO2 emission by 97%. Large emission reductions were also seen for conversions from oil and gas boilers to a biomass-based system. However, for these conversions the heating cost increased, leading to a mitigation cost of around €50/tonne C avoided. The price of oil and natural gas greatly influenced the competitiveness of the alternatives. House envelope measures were more cost-effective for houses with electric boilers as the cost of energy for this system is high. The results are specific to a Swedish context, but also give an indication of the potential in other regions, such as northern European and large parts of North America, which have both a cold climate and a widespread use of domestic boilers.

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Acknowledgements

We acknowledge the economic support provided by The Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning, and the European Union.

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  1. Department of Engineering and Sustainable Development, Mid Sweden University, 831 25, Östersund, Sweden

    Anna Joelsson & Leif Gustavsson

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  1. Anna Joelsson
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Correspondence to Anna Joelsson.

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Joelsson, A., Gustavsson, L. Energy efficiency measures and conversion of fossil fuel boiler systems in a detached house. Energy Efficiency 3, 223–236 (2010). https://doi.org/10.1007/s12053-009-9062-x

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