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Energy Effectiveness or Economic Profitability? A Case Study of Thermal Modernization of a School Building

Author

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  • Piotr Michalak

    (Department of Power Systems and Environmental Protection Facilities, Faculty of Mechanical Engineering and Robotics, AGH University of Science and Technology, Mickiewicza 30, 30-059 Kraków, Poland)

  • Krzysztof Szczotka

    (Department of Power Systems and Environmental Protection Facilities, Faculty of Mechanical Engineering and Robotics, AGH University of Science and Technology, Mickiewicza 30, 30-059 Kraków, Poland)

  • Jakub Szymiczek

    (Department of Power Systems and Environmental Protection Facilities, Faculty of Mechanical Engineering and Robotics, AGH University of Science and Technology, Mickiewicza 30, 30-059 Kraków, Poland)

Abstract

Thermal refurbishment of buildings results in certain energy, financial, and environmental effects. Such investments are financially supported in Poland after meeting the legally defined conditions of thermal protection and energy consumption. This paper presents a complex thermal modernization of a school building, performed by following Polish regulations. A detailed description of the studied object was given, and the calculation procedure was described. Then an optimal variant of an investment and an ex-post analysis were described. Simple payback time (SPBT) of modernization measures was from 15.8 years (insulation of the ceiling under the unheated attic) to 87 years for insulation of the wooden external wall, with 35.6 years for the whole project, which is shorter than the predicted lifespan of the whole building (50–70 years). Annual calculated heating demand decreased from 464.78 to 168.73 GJ, resulting in the primary energy consumption indicator (EP) of 484.44 and 129.46 kWh/m 2 , respectively. Thermal refurbishment with the replacement of an old boiler into a new wood-pellet one resulted in a significant reduction of SO 2 and dust emissions from 451 to 27.5 kg and from 399 to 13 kg, respectively.

Suggested Citation

  • Piotr Michalak & Krzysztof Szczotka & Jakub Szymiczek, 2021. "Energy Effectiveness or Economic Profitability? A Case Study of Thermal Modernization of a School Building," Energies, MDPI, vol. 14(7), pages 1-21, April.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:7:p:1973-:d:529404
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    References listed on IDEAS

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    3. Anna Barwińska-Małajowicz & Radosław Pyrek & Krzysztof Szczotka & Jakub Szymiczek & Teresa Piecuch, 2023. "Improving the Energy Efficiency of Public Utility Buildings in Poland through Thermomodernization and Renewable Energy Sources—A Case Study," Energies, MDPI, vol. 16(10), pages 1-21, May.
    4. Karim Mohamed Ragab & Mehmet Fatih Orhan & Kenan Saka & Yousef Zurigat, 2022. "A Study and Assessment of the Status of Energy Efficiency and Conservation at School Buildings," Sustainability, MDPI, vol. 14(17), pages 1-31, August.
    5. Anna Barwińska Małajowicz & Miroslava Knapková & Krzysztof Szczotka & Miriam Martinkovičová & Radosław Pyrek, 2022. "Energy Efficiency Policies in Poland and Slovakia in the Context of Individual Well-Being," Energies, MDPI, vol. 16(1), pages 1-29, December.
    6. Marek Borowski, 2022. "Hotel Adapted to the Requirements of an nZEB Building—Thermal Energy Performance and Assessment of Energy Retrofit Plan," Energies, MDPI, vol. 15(17), pages 1-17, August.
    7. Beata Sadowska & Joanna Piotrowska-Woroniak & Grzegorz Woroniak & Wiesław Sarosiek, 2022. "Energy and Economic Efficiency of the Thermomodernization of an Educational Building and Reduction of Pollutant Emissions—A Case Study," Energies, MDPI, vol. 15(8), pages 1-31, April.
    8. Robert Dylewski & Janusz Adamczyk, 2022. "Building Energy: Economics and Environment," Energies, MDPI, vol. 15(20), pages 1-2, October.
    9. Dariusz Bajno & Agnieszka Grzybowska & Łukasz Bednarz, 2021. "Old and Modern Wooden Buildings in the Context of Sustainable Development," Energies, MDPI, vol. 14(18), pages 1-31, September.
    10. Krzysztof Szczotka & Anna Barwińska-Małajowicz & Jakub Szymiczek & Radosław Pyrek, 2023. "Thermomodernization as a Mechanism for Improving Energy Efficiency and Reducing Emissions of Pollutants into the Atmosphere in a Public Utility Building," Energies, MDPI, vol. 16(13), pages 1-24, June.
    11. Piotr Michalak, 2021. "Experimental and Theoretical Study on the Internal Convective and Radiative Heat Transfer Coefficients for a Vertical Wall in a Residential Building," Energies, MDPI, vol. 14(18), pages 1-22, September.
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    13. Piotr Michalak, 2023. "Simulation and Experimental Study on the Use of Ventilation Air for Space Heating of a Room in a Low-Energy Building," Energies, MDPI, vol. 16(8), pages 1-17, April.

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