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A Spatially-Explicit Economic and Financial Assessment of Closed-Loop Ground-Source Geothermal Heat Pumps: A Case Study for the Residential Buildings of Valle d’Aosta Region

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  • Antonio Novelli

    (Planetek Italia, Via Massaua 12, 70132 Bari, Italy
    Institute for Renewable Energy, European Academy of Bolzano (EURAC Research), Viale Druso 1, 39100 Bolzano, Italy)

  • Valentina D’Alonzo

    (Institute for Renewable Energy, European Academy of Bolzano (EURAC Research), Viale Druso 1, 39100 Bolzano, Italy)

  • Simon Pezzutto

    (Institute for Renewable Energy, European Academy of Bolzano (EURAC Research), Viale Druso 1, 39100 Bolzano, Italy)

  • Rubén Aarón Estrada Poggio

    (Institute for Renewable Energy, European Academy of Bolzano (EURAC Research), Viale Druso 1, 39100 Bolzano, Italy)

  • Alessandro Casasso

    (Department of Environment, Land and Infrastructure Engineering (DIATI), Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy)

  • Pietro Zambelli

    (Institute for Renewable Energy, European Academy of Bolzano (EURAC Research), Viale Druso 1, 39100 Bolzano, Italy)

Abstract

Ground Source Heat Pumps (GSHPs) take advantage of the high thermal inertia of the ground to achieve a higher energy efficiency compared to Air Source Heat Pumps. GSHPs, therefore, have the potential to reduce heating, cooling, and domestic hot water costs, however the high installation cost of borehole heat exchangers (BHEs) limits the growth of such installations. Nevertheless, GSHPs can be profitable under certain conditions (climate, expensive fuels, subsidies, etc.), which can be identified using geo-referenced data and Geographical Information Systems (GIS). The proposed work investigates the economic and financial ability of GSHPs to cover the heat demand of the residential building stock of the Italian region Valle d’Aosta. To identify the opportunities offered by GSHPs in the Valle d’Aosta region, more than 40,000 residential buildings were analyzed using a GIS-based method. The return on the investment was then assessed based on the occurrence of two conditions—the Italian subsidies of the “Conto Termico” and the installation of rooftop photovoltaic (PV) systems—which contribute to the reduction of the initial and operation costs, respectively. The life-cycle costs of the four resulting combinations were compared with conventional systems composed of an oil/gas boiler and an air-source chiller. One of the main findings of this study is that subsidies exert a key role in the financial feasibility of GSHPs, especially for replacing gas boilers, whereas the presence of a PV system has a minor influence on the financial analysis carried out.

Suggested Citation

  • Antonio Novelli & Valentina D’Alonzo & Simon Pezzutto & Rubén Aarón Estrada Poggio & Alessandro Casasso & Pietro Zambelli, 2021. "A Spatially-Explicit Economic and Financial Assessment of Closed-Loop Ground-Source Geothermal Heat Pumps: A Case Study for the Residential Buildings of Valle d’Aosta Region," Sustainability, MDPI, vol. 13(22), pages 1-22, November.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:22:p:12516-:d:677826
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    References listed on IDEAS

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    Cited by:

    1. Romanov, D. & Leiss, B., 2022. "Geothermal energy at different depths for district heating and cooling of existing and future building stock," Renewable and Sustainable Energy Reviews, Elsevier, vol. 167(C).
    2. Edoardo Ruffino & Bruno Piga & Alessandro Casasso & Rajandrea Sethi, 2022. "Heat Pumps, Wood Biomass and Fossil Fuel Solutions in the Renovation of Buildings: A Techno-Economic Analysis Applied to Piedmont Region (NW Italy)," Energies, MDPI, vol. 15(7), pages 1-25, March.
    3. Carlos Lorente Rubio & Jorge Luis García-Alcaraz & Juan Carlos Sáenz-Diez Muro & Eduardo Martínez-Cámara & Agostino Bruzzone & Julio Blanco-Fernández, 2022. "Environmental Impact Comparison of Geothermal Alternatives for Conventional Boiler Replacement," Energies, MDPI, vol. 15(21), pages 1-15, November.
    4. Erika Buday-Bódi & Ali Irfan & Richard William McIntosh & Zsolt Zoltán Fehér & József Csajbók & Csaba Juhász & László Radócz & Arnold Szilágyi & Tamás Buday, 2022. "Subregion-Scale Geothermal Delineation Based on Image Analysis Using Reflection Seismology and Well Data with an Outlook for Land Use," Sustainability, MDPI, vol. 14(6), pages 1-21, March.

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