Distributed thermal response tests on pipe-in-pipe borehole heat exchangers

Acuña, José; Palm, Björn

doi:10.1016/j.apenergy.2013.01.024

Cited by 172 publications

(107 citation statements)

References 16 publications

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“…The first method consists in temperature logging along the borehole, usually by lowering a temperature probe into the U-pipe and measuring the temperature at several depth intervals or by installed temperature sensors or fiber optic cables along the [17,18]. The second method consists in circulating the fluid inside the pipe loops without heat injection and recording the temperature at the pipe inlet and outlet.…”

Section: Introductionmentioning

confidence: 99%

Effect of undisturbed ground temperature on the design of closed-loop geothermal systems: A case study in a semi-urban environment

et al. 2017

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This paper presents temperature measurements in four Borehole Heat Exchangers (BHEs), equipped with fiber optics and located in a semi-urban environment (campus of the University of Liege, Belgium). A 3D numerical model is also presented to simulate the heat loss from the surrounding structures into the subsurface. The mean undisturbed ground temperature was estimated from data during the preliminary phase of a thermal response test (water circulation in the pipe loops), as well as from borehole logging measurements. The measurements during water circulation can significantly overestimate the ground temperature (up to 1.7 °C in this case study) for high ambient air temperature during the test, resulting in an overestimation of the maximum extracted power and of the heat pump coefficient of performance (COP). To limit the error in the COP and the extracted power to less than 5%, the error in the undisturbed temperature estimation should not exceed ±1.5 °C and ±0.6 °C respectively. In urbanised areas, configurations of short BHEs (length < 40 m) could be economically advantageous (decreased installation and operation costs) compared to long BHEs, especially for temperature gradient lower than -0.05 °C/m.

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Section: Introductionmentioning

confidence: 99%

Effect of undisturbed ground temperature on the design of closed-loop geothermal systems: A case study in a semi-urban environment

et al. 2017

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“…They show the reliability of the technique for the interpretation of thermal response test. Acuna et al [135] similarly performed a distributed thermal response test with the fiber optic cables enclosed in the U-pipe. Such measures have helped to demonstrate and quantify a significant difference between the average thermal resistance of drilling obtained by thermal response tests and estimated thermal resistances along the drilling using distributed measurements.…”

Section: Using Dts To Measure Temperaturementioning

confidence: 99%

Geophysical Methods for Monitoring Temperature Changes in Shallow Low Enthalpy Geothermal Systems

Hermans

Nguyen

Robert³

et al. 2014

Energies

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Low enthalpy geothermal systems exploited with ground source heat pumps or groundwater heat pumps present many advantages within the context of sustainable energy use. Designing, monitoring and controlling such systems requires the measurement of spatially distributed temperature fields and the knowledge of the parameters governing groundwater flow (permeability and specific storage) and heat transport (thermal conductivity and volumetric thermal capacity). Such data are often scarce or not available. In recent years, the ability of electrical resistivity tomography (ERT), self-potential method (SP) and distributed temperature sensing (DTS) to monitor spatially and temporally temperature changes in the subsurface has been investigated. We review the recent advances in using these three methods for this type of shallow applications. A special focus is made regarding the petrophysical relationships and on underlying assumptions generally needed for a quantitative interpretation of these geophysical data. We show that those geophysical methods are mature to be used within the context of temperature monitoring and that a combination of them may be the best choice regarding control and validation issues. OPEN ACCESSEnergies 2014, 7 5084

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“…However, the fluid temperature was assumed to be constant during the circulation period, thus simplifying the problem. In another study, Acuña and Palm [47] proposed the use of optical fibers to measure the borehole wall temperature. The technique consisted of a fiber optic cable pressed against the borehole wall with a flexible plastic pipe that is filled with water once it is installed in the ground.…”

Section: Layered Soil Profilementioning

confidence: 99%

A computationally efficient pseudo-3D model for the numerical analysis of borehole heat exchangers

Brunetti

Saito

et al. 2017

Applied Energy

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Distributed thermal response tests on pipe-in-pipe borehole heat exchangers

Cited by 172 publications

References 16 publications

Effect of undisturbed ground temperature on the design of closed-loop geothermal systems: A case study in a semi-urban environment

Effect of undisturbed ground temperature on the design of closed-loop geothermal systems: A case study in a semi-urban environment

Geophysical Methods for Monitoring Temperature Changes in Shallow Low Enthalpy Geothermal Systems

A computationally efficient pseudo-3D model for the numerical analysis of borehole heat exchangers

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