Multi-injection rate thermal response test with forced convection in a groundwater-filled borehole in hard rock

Liebel, Heiko T.; Javed, Saqib; Vistnes, Gunnar

doi:10.1016/j.renene.2012.05.005

Cited by 28 publications

(11 citation statements)

References 5 publications

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“…The application of both of these datasets for the estimation of thermal resistance of standard grouted boreholes is affected by certain limitations. The thermal resistance and the vertical temperature profile of the groundwater-filled borehole is characterized by buoyancy-driven convective heat transfer rather than conduction in the borehole annulus [12,21]. On the other hand, the use of aluminium casing along the entire borehole length in the sandbox facility results in nearly uniform temperature along the borehole perimeter.…”

Section: Introductionmentioning

confidence: 99%

Accuracy of borehole thermal resistance calculation methods for grouted single U-tube ground heat exchangers

Javed

Spitler

2017

Applied Energy

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Section: Introductionmentioning

confidence: 99%

Accuracy of borehole thermal resistance calculation methods for grouted single U-tube ground heat exchangers

Javed

Spitler

2017

Applied Energy

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“…One of the fundamental key for their optimization is to obtain precise theoretical model for their designing. Indeed, their modelling is very complex because it requires a long-term steady-state temperature response; consequently, many simplified assumptions are usually introduced [25][26][27][28][29][30][31][32], even if these systems present transient responses, which would be taken into account. Moreover, their temperature response depends on the heat transfer inside the borehole and its heat conduction [26,27].…”

Section: Thermodynamic Analysis Of the Ghe (Ground Heat Exchanger)mentioning

confidence: 99%

Ground-source pump system for heating and cooling: Review and thermodynamic approach

Lucia

Simonetti

Chiesa

et al. 2017

Renewable and Sustainable Energy Reviews

129

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Ground source heat pump (GSHP) is an innovative and perspective technology able to use the ground as a thermal sink or heat source. If combined with system operating at relatively low temperature, it represents a high efficiency solution for the heating of buildings. Complementarily, during cooling operation it has a good advantage with respect to air-cooled systems, because the ground temperature is stably lower than the outdoor air one. Geothermal heat pump systems are able to reduce the environmental impact of buildings for space heating and cooling by using the ground as an energy renewable source. This paper presents a review on the GSHP systems presenting both a summary of different ground-source typologies of heat pumps and a thermodynamic approach for their modeling. The irreversible thermodynamic approach is here summarized and exposed for a complete GSHPs system. This analytical approach is particularly useful for implementing an optimization design tool for GSHP systems. Recently many works have 2 been published about exergy analysis of these systems. Those works suggest that future lines of development may be considered: a) the optimization based on the transient performance of GSHP systems and not on the sole design condition; b) the integration of irreversible thermodynamic optimization approach into the algorithms of control systems. The diffusion of optimized GSHP systems is essential in order to reduce fossil fuel consumption and CO 2 emissions, complying with the EU's directive.

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“…Some later researchers [18,60,61] have made tests with different heat rejection rates and even using both heat injection and heat extraction as part of a single test. The OSU team experimented with multiple heat pulses with different heat injection rates, but found no discernible advantage over the single pulse, single heat rejection test when attempting to estimate ground thermal conductivity.…”

Section: Development Of Test Proceduresmentioning

confidence: 99%

“…The OSU team experimented with multiple heat pulses with different heat injection rates, but found no discernible advantage over the single pulse, single heat rejection test when attempting to estimate ground thermal conductivity. For groundwater-filled boreholes, multiple pulse tests [18,61] have been useful in showing how borehole thermal resistance can change with heat transfer rate and temperature.…”

Section: Development Of Test Proceduresmentioning

confidence: 99%

Thermal response testing for ground source heat pump systems—An historical review

Spitler

Gehlin²

2015

Renewable and Sustainable Energy Reviews

237

112

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Multi-injection rate thermal response test with forced convection in a groundwater-filled borehole in hard rock

Cited by 28 publications

References 5 publications

Accuracy of borehole thermal resistance calculation methods for grouted single U-tube ground heat exchangers

Accuracy of borehole thermal resistance calculation methods for grouted single U-tube ground heat exchangers

Ground-source pump system for heating and cooling: Review and thermodynamic approach

Thermal response testing for ground source heat pump systems—An historical review

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