A review of ground investigations for ground source heat pump (GSHP) systems

Luo, Jun; Rohn, Joachim; Xiang, Wei; Bertermann, David; Blum, Philipp

doi:10.1016/j.enbuild.2016.02.038

Cited by 162 publications

(52 citation statements)

References 76 publications

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“…The manuscript focuses on different techniques inspired from the Earth science sector and available to assess the subsurface thermal conductivity for geothermal applications, distinguishing from previous TRT reviews focusing on analytical methods Raymond et al 2011b;Zhang et al 2014;Luo et al 2016b) and an additional historical review describing scientific and commercial developments of TRT apparatus (Spitler and Gehlin 2015).…”

Section: Introductionmentioning

confidence: 99%

Colloquium 2016: Assessment of subsurface thermal conductivity for geothermal applications

Raymond

2018

Can. Geotech. J.

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The construction of green buildings using geothermal energy requires knowledge of the ground thermal conductivity, assessed when designing the heating and cooling system of commercial buildings with ground-coupled heat pumps. The most commonly used method for active field assessment is the thermal response test (TRT), which consists of circulating heated water in a pilot ground heat exchanger (GHE) where temperature and flow rate are monitored. The transient thermal perturbation is analyzed to evaluate the subsurface thermal conductivity. Heat injection can also be performed with a heating cable in the GHE to conduct a TRT without water circulation, which can be affected by surface temperature variations. Mots-clés : géothermie, géothermique, géophysique thermique, pompe à chaleur, conductivité thermique, test de réponse thermique, échangeur de chaleur au sol.

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Section: Introductionmentioning

confidence: 99%

Colloquium 2016: Assessment of subsurface thermal conductivity for geothermal applications

Raymond

2018

Can. Geotech. J.

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“…The line inclination in the second measurement is 3.4, while in the first measurement is 1.96. Standard ILS procedure is used to determine thermal conductivity and borehole thermal resistance and results are listed in Table 1 [3,4]. Temperature curves from figures 12 and 13 are used to calculate the rate of temperature change over time.…”

Section: Comparison Of Trt's and Discussionmentioning

confidence: 99%

“…These properties cannot be influenced and they vary depending on the ground composition, porosity and the presence of groundwater. The properties of interest are, above all, thermal conductivity λ, W/(m·K) and specific heat capacity c, J/(kg·K) [3]. As the ground in most cases possess non-homogeneous structure, the ground thermal conductivity is expressed as effective value for a given location.…”

Section: Introductionmentioning

confidence: 99%

Ground Thermal Response and Recovery after Heat Injection: Experimental Investigation

Boban

Soldo

Stošić

et al. 2018

TFAMENA

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SummaryMonitoring the ground thermal response to a constant heat flux input is common method for determination of effective ground properties needed for sizing the ground coupled heat pumps. In this work, the experimental procedure included two TRT's with different average injection heat fluxes, 4.43 kW and 7.64 kW, applied to the same borehole. Recorded temperatures of fluids, circulated in an experimental borehole heat exchanger U-tube, are used to determine the ground thermal conductivity and the borehole thermal resistance with the infinite line source model (ILS). Additionally, thermocouples placed on the borehole wall up to the depth of 100 m enabled the measurement of temperature profiles of undisturbed ground and during the recovery period between the two TRTs. The results indicate that true undisturbed state after injected heat flux cannot be reached in short time while the use of higher injection heat flux reduces the influence of the ground's inhomogeneity on the results obtained.

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“…Kupiec et al [9], presented the mathematical model of a horizontal ground heat exchanger. Luo et al [10], presented ground investigations for different types of GSHP systems. Based on recently published literature [11], a simple heat and moisture transfer model to predict ground temperature for shallow ground heat exchangers was considered.…”

Section: Introductionmentioning

confidence: 99%

Coefficient of Performance Stabilisation in Ground Source Heat Pump Systems

Wołoszyn¹,

Gołaś²

2017

J. sustain. dev. energy water environ. syst.

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The number of installations with ground source heat pumps is steadily increasing. As they involve high investment costs, they require deliberate action and analysis. Research on the influence of design, materials and operating parameters on their coefficient of performance becomes of great importance. In this article the authors propose a new ground source heat pump system with horizontal ground heat exchanger and subsurface irrigation system. In order to examine the possibility of applying the system, the influence of soil moisture content on the heat pump coefficient of performance was investigated in this research. Conducting research on the real object is extremely expensive, so it was decided to conduct simulation studies using the finite element method. The presented results of research confirm that the soil moisture content has the greatest impact on the heat pump system coefficient of performance. The developed ground source heat pump system with subsurface irrigation system allow to reduce the length of ground heat exchanger loop.

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A review of ground investigations for ground source heat pump (GSHP) systems

Cited by 162 publications

References 76 publications

Colloquium 2016: Assessment of subsurface thermal conductivity for geothermal applications

Colloquium 2016: Assessment of subsurface thermal conductivity for geothermal applications

Ground Thermal Response and Recovery after Heat Injection: Experimental Investigation

Coefficient of Performance Stabilisation in Ground Source Heat Pump Systems

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