Conceptual design of solar/geothermal hybrid system focusing on technical, economic and environmental parameters

Mohammad Nahavandinezhad and Alireza Zahedi

Renewable Energy, 2022, vol. 181, issue C, 1110-1125

Abstract: The costs of gas transportation and its environmental/security impacts in Iran have led to evaluating geothermal/solar renewable sources instead. Regarding the high potential of geothermal/solar in Sistan/Baluchestan province, Iran, which have still no access to the global gas network, these resources create a desirable plan. This paper attempted to present/compare four possible solar-assisted ground source heat pumps to supply four purposes of electricity demand, heating/cooling, and domestic hot water. First, the energy needed in the region was designed with DesignBuilder. Then, each proposed system was modeled in Polysun software using a photovoltaic-thermal and a vertical geothermal heat exchanger. Afterward, all probable plans were evaluated and compared technically, economically, and environmentally. The results indicated that the maximum/minimum values of the coefficient of heat pump performance for direct heat exchanger and series systems were 4.39/3.87. Also, the optimal plan was introduced with 4957/10667 kWh electricity consumption/production. Besides, an economic analysis was estimated for the optimal strategy with an investment return of 7years. The designed system prevented 5089kgCO2 emissions annually. By means of this integrating hybrid system, Sistan/Baluchestan province would become a significant renewable power plant globally, and a considerable techno-economic and environmental challenge would be dissolved in Iran.

Keywords: Coefficient of heat pump performance; Domestic hot water; Ground source heat pump; Polysun; Solar-assisted ground source heat pump; Solar-assisted heat pumps (search for similar items in EconPapers)
Date: 2022
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Citations: View citations in EconPapers (6)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:181:y:2022:i:c:p:1110-1125

DOI: 10.1016/j.renene.2021.09.110

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