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1.
Economic analysis of geothermal heat source for residential area project
Sašo Poberžnik, Darko Goričanec, Jurij Krope, 2007, original scientific article

Abstract: The article discusses the economic analysis of heat source for residential area project. The energy source is geothermal energy. Every house has its own borehole heat exchanger (BHE) and heat pump in basement. In this system low temperature floor and wall heating was carried out. The economic analysis was performed as a pilot study for real system with all installation needed to runthe system. The analysis has been done using the method of the net present value. In the research the coefficient of profitability and the period of timein which the investment is going to return itself were established. The system has been compared to the conventional system that uses fossil fuel (Liquidized naphtha gas- LNG) to heat the building and domestic hot water.
Keywords: geothermal heat, area projects, borehole heat exchanger, economic analysis
Published: 31.05.2012; Views: 1256; Downloads: 31
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2.
Response functions and thermal influence for various multiple borehole configurations in ground coupled heat pump systems
Metka Pešl, Darko Goričanec, 2007, original scientific article

Abstract: Ground coupled heat pump (GCHP) utilizes the immense renewable storage capacity of the ground as a heat source or sink to provide space heating, cooling, and domestic hot water. GCHP systems are generally comprised of watersource heat pumps and ground heat exchangers (GHEs). Consisting of closedloop of pipes buried in boreholes, ground heat exchangers (GHEs) are devised for extraction or injection of thermal energy from/into the ground. Despite the low energy and lower maintenance benefits of ground-source heat pump systems, little work has been undertaken in detailed analysis. Many models, either numerical or analytical, have been proposed to analyze the thermal response of vertical heat exchangers that are used in ground coupled heat pump systems (GCHP). In both approaches, most of the models are valid after few hours of operation since they neglect the heat capacity of the borehole. In this paper, we present for three various multiple borehole configurations a comparison between g-functions, which will be calculated after an analytical model of final line source and g-functions, obtain with numerical model derived from the work of Eskilson. A case study is presented to show how the ground temperature changes with time for various multiple borehole configurations.
Keywords: geothermal heat exchanger, heat transfer, heat conduction, thermal influence
Published: 31.05.2012; Views: 1422; Downloads: 36
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