Ground water level influence on thermal response test in Adana, Turkey

Bozdağ, Şaziye; Turgut, B.; Paksoy, Halime; Dikici, D.; Mazman, Muhsin; Evliya, Hunay

doi:10.1002/er.1378

Cited by 21 publications

(10 citation statements)

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“…The testing units come in various sizes, ranging from that of a suitcase to a trailer. More detailed descriptions of TRT units can be found in the study by Austin III (1998) and Gehlin and Spitler (2002), and several recent examples of TRT experiments and analysis have been reported (Roth et al 2004; Sanner et al 2005, 2007; Katzenbach et al 2007; Lim et al 2007; Bozdağ et al 2008; Esen and Inalli 2009; Sharqawy et al 2009b). Additional studies reported alternative methods for in situ measurement of the subsurface thermal conductivity, such as the estimation of properties with temperature profiling (Rohner et al 2005), tests performed with heating cables (Heidinger et al 2004; Raymond et al 2010), TRTs that included temperature measurements along the borehole (Fujii et al 2009) and the simulation of a TRT carried out while drilling (Gustafsson 2006).…”

Section: Field Test Methodologymentioning

confidence: 99%

A Review of Thermal Response Test Analysis Using Pumping Test Concepts

et al. 2011

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The design of ground-coupled heat pump systems requires knowledge of the thermal properties of the subsurface and boreholes. These properties can be measured with in situ thermal response tests (TRT), where a heat transfer fluid flowing in a ground heat exchanger is heated with an electric element and the resulting temperature perturbation is monitored. These tests are analogous to standard pumping tests conducted in hydrogeology, because a system that is initially assumed at equilibrium is perturbed and the response is monitored in time, to assess the system's properties with inverse modeling. Although pumping test analysis is a mature topic in hydrogeology, the current analysis of temperature measurements in the context of TRTs is comparatively a new topic and it could benefit from the application of concepts related to pumping tests. The purpose of this work is to review the methodology of TRTs and improve their analysis using pumping test concepts, such as the well function, the superposition principle, and the radius of influence. The improvements are demonstrated with three TRTs. The first test was conducted in unsaturated waste rock at an active mine and the other two tests aimed at evaluating the performance of thermally enhanced pipe installed in a fully saturated sedimentary rock formation. The concepts borrowed from pumping tests allowed the planning of the duration of the TRTs and the analysis of variable heat injection rate tests accounting for external heat transfer and temperature recovery, which reduces the uncertainty in the estimation of thermal properties.

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Section: Field Test Methodologymentioning

confidence: 99%

A Review of Thermal Response Test Analysis Using Pumping Test Concepts

et al. 2011

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“…Groundwater flow can influence heat transfer and an effective thermal conductivity varying, for example, up to 16 % has been found for TRTs carried out under different groundwater flow conditions (Bozdağ et al 2008). TRT with downhole temperature measurements analyzed with infinite line or cylindrical source equations can reveal zones of higher equivalent thermal conductivity that can be associated with groundwater flow if corresponding to facture zones (Fujii et al 2009).…”

Section: Trt Influenced By Groundwater Flowmentioning

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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“…Although numerical tools are available to optimize the operation of a GCHP system under the influence of groundwater flow [5,6], an estimate of the specific groundwater flux affecting a GHE field can be difficult to define accurately. Alternatively, different authors have performed thermal response tests (TRTs) on a single GHE subject to groundwater flow to evaluate the equivalent subsurface thermal conductivity impacted by advection [7,8]. Practitioners commonly using such a heat conduction approach to simulate the long-term operating temperature of GHEs, based on an equivalent subsurface thermal conductivity assumption, have tried to cope with systems influenced by groundwater flow.…”

Section: Introductionmentioning

confidence: 99%

Long-Term Temperature Evaluation of a Ground-Coupled Heat Pump System Subject to Groundwater Flow

et al. 2019

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The performance of ground-coupled heat pump systems (GCHPs) operating under significant groundwater flow can be difficult to predict due to advective heat transfer in the subsurface. This is the case of the Carignan-Salières elementary school located on the south shore of the St. Lawrence River near Montréal, Canada. The building is heated and cooled with a GCHP system including 31 boreholes subject to varying groundwater flow conditions due to the proximity of an active quarry being irregularly dewatered. A study with the objective of predicting the borehole temperatures in order to anticipate potential operational problems was conducted, which provided an opportunity to evaluate the impact of groundwater flow. For this purpose, a numerical model was calibrated using a full-scale heat injection test and then run under different scenarios for a period of twenty years. The heat exchange capacity of the GCHP system is clearly enhanced by advection when the Darcy flux changes from 6 × 10−8 m s−1 (no dewatering) to 8 × 10−7 m s−1 (high dewatering). This study further suggests that even the lowest groundwater flow condition can be beneficial to avoid a progressive cooling of the subsurface due to the unbalanced building loads, which can have important impacts for design of new systems.

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Ground water level influence on thermal response test in Adana, Turkey

Cited by 21 publications

References 0 publications

A Review of Thermal Response Test Analysis Using Pumping Test Concepts

A Review of Thermal Response Test Analysis Using Pumping Test Concepts

Colloquium 2016: Assessment of subsurface thermal conductivity for geothermal applications

Long-Term Temperature Evaluation of a Ground-Coupled Heat Pump System Subject to Groundwater Flow

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