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Economic and Environmental Analysis of Investing in Solar Water Heating Systems

Author

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  • Alexandru Şerban

    (Faculty of Civil Engineering, Transilvania University of Brasov, 500152 Brasov, Romania)

  • Nicoleta Bărbuţă-Mişu

    (Faculty of Economics and Business Administration, Dunarea de Jos University of Galati, 47 Domneasca Street, 800008 Galati, Romania)

  • Nicoleta Ciucescu

    (Faculty of Economics, Vasile Alecsandri University of Bacau, 157 Marasesti Street, 600115 Bacau, Romania)

  • Simona Paraschiv

    (Faculty of Engineering, Dunarea de Jos University of Galati, 47 Domneasca Street, 800008 Galati, Romania)

  • Spiru Paraschiv

    (Faculty of Engineering, Dunarea de Jos University of Galati, 47 Domneasca Street, 800008 Galati, Romania)

Abstract

Solar water heating (SWH) systems can provide a significant part of the heat energy that is required in the residential sector. The use of SWH systems is motivated by the desire to reduce energy consumption and especially to reduce a major source of greenhouse gas (GHG) emissions. The purposes of the present paper consist in: assessing the solar potential; analysing the possibility of using solar energy to heat water for residential applications in Romania; investigating the economic potential of SWH systems; and their contribution to saving energy and reducing CO 2 emissions. The results showed that if solar systems are used, the annual energy savings amount to approximately 71%, and the reduction of GHG emissions into the atmosphere are of 18.5 tonnes of CO 2 over the lifespan of the system, with a discounted payback period of 6.8–8.6 years, in accordance with the savings achieved depending on system characteristics, the solar radiation available, ambient air temperature and on heating load characteristics. Financially, the installation of SWH systems determines net savings of 805–1151 Euro in a 25-year period in the absence of governmental subsidies. According to the sensitivity analysis, installing a SWH system with subsidies of up to 50% determines the reduction of the discounted payback period to 3.1–3.9 years and the increase of net savings to 1570–1916 Euro. These results indicate that investing in these systems is cost-effective for Romanian households as long as the governmental subsidies increase.

Suggested Citation

  • Alexandru Şerban & Nicoleta Bărbuţă-Mişu & Nicoleta Ciucescu & Simona Paraschiv & Spiru Paraschiv, 2016. "Economic and Environmental Analysis of Investing in Solar Water Heating Systems," Sustainability, MDPI, vol. 8(12), pages 1-21, December.
    • Handle: RePEc:gam:jsusta:v:8:y:2016:i:12:p:1286-:d:84704
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    2. Karki, Saroj & Haapala, Karl R. & Fronk, Brian M., 2019. "Technical and economic feasibility of solar flat-plate collector thermal energy systems for small and medium manufacturers," Applied Energy, Elsevier, vol. 254(C).
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    4. Ephraim Bonah Agyekum & Tahir Khan & Nimay Chandra Giri, 2023. "Evaluating the Technical, Economic, and Environmental Performance of Solar Water Heating System for Residential Applications–Comparison of Two Different Working Fluids (Water and Glycol)," Sustainability, MDPI, vol. 15(19), pages 1-24, October.
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