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TECHNICAL PAPERS

Theoretical Model of Borehole Heat Exchanger

[+] Author and Article Information
Tomasz Śliwa

Faculty of Drilling, Oil and Gas Drilling and Geoengineering Dpt., University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków, Polandsliwa@agh.edu.pl

Andrzej Gonet

Faculty of Drilling, Oil and Gas Drilling and Geoengineering Dpt., University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków, Polandgonet@agh.edu.pl

J. Energy Resour. Technol 127(2), 142-148 (Dec 13, 2004) (7 pages) doi:10.1115/1.1877515 History: Received November 25, 2002; Revised December 13, 2004

The paper deals with the possible use of existing oil wells for geothermal energy production. A mathematical model, describing the process of exploitation of a borehole heat exchanger, has been worked out. It was used for determining energy efficiency, employing the main parameter, i.e., flow of produced heat energy. The results of simulation of borehole heat exchanger operation in deep conditions of Iwonicz Zdrój field’s depleted deposits (Polish Carpathians) are presented. A considerable part of oil deposits in the Carpathian region—a cradle of the world’s oil industry—are to be decommissioned. Owing to the high density of population, the wells are planned to be adapted for borehole heat exchangers for clean energy production for local purposes. The decommissioning costs will be avoided.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of a borehole heat exchanger; 1–heating system; 2–circulation pump; 3–surface piping, 4–well casing, 5–inner isolation string; 6–heat pump; 7–sealing plug

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Figure 2

Dependence of heating power on time of BHE exploitation in well Elin 10 (24,27), at heat carrier flow rate equal to 10m3h−1; 1–for 870m depth and heat carrier injection temperature 2°C; 2–870m depth and heat carrier injection temperature 4°C; 3–590m depth and heat carrier injection temperature 2°C

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Figure 3

Dependence of output temperature in Elin 3 well (26-27) on the volume flow rate of heat carrier, at heat carrier injection temperature 2°C. 1–after one year days of exploitation, 2–after 30days of exploitation BHE.

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Figure 4

Dependence of difference between heating power and hydraulic power needed to overcome flow losses, depending on the flow rate of heat carrier in BHE Elin 3, at temperature of heat carrier injection 2°C; 1–hydraulic power, 2–heating power after 30days of exploitation, 3–heating power after 365days of exploitation

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Figure 5

Dependence of difference between heat power and hydraulic power values, related to heat carrier losses as a function of volume flow rate in BHE Elin 3, at temperature of injected carrier 2°C; 1–after 30days of exploitation; 2–after 365days of exploitation

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Figure 6

Heat flow in an elementary cylinder

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