Numerical simulation of ground source heat pump systems considering unsaturated soil properties and groundwater flow

Li, Chaofeng; Cleall, Peter John; Mao, Jinfeng; Muñoz-Criollo, José Javier

doi:10.1016/j.applthermaleng.2018.04.142

Cited by 69 publications

(15 citation statements)

References 43 publications

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“…Sensitivity analysis also showed the results that both the design parameters and operational parameters have a major influence on the GSHP performance [9]. The influence of unsaturated condition and groundwater flow on the performance of GSHPs was examined, which showed that groundwater level affected the performance of the GSHP system [10]. Therefore, it is important to subsurface conditions.…”

Section: Introductionmentioning

confidence: 99%

“…The installation potential of GSHP systems was investigated using field survey 2 of 18 data [12] and numerical simulation [1,13,14]. Many studies showed that groundwater flow velocity increases the heat exchange rate (HER) and temperature distribution in the vicinity of the ground heat exchanger (GHE) [10,[15][16][17][18][19]. The development and uptake of this system in Japan are gradually increasing.…”

Section: Introductionmentioning

confidence: 99%

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Proposal for a Method Predicting Suitable Areas for Installation of Ground-Source Heat Pump Systems Based on Response Surface Methodology

Kaneko¹,

Tomigashi²,

Ishihara³

et al. 2020

Energies

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The installation potential of ground-source heat pump (GSHP) systems has been studied based on the spatial interpolation of numerical simulation results using ground heat exchanger (GHE) models. This study is the first to create an estimation formula for the heat exchange rate (HER) to obtain a solution equivalent to the numerical analysis results considering the average method when supplying three-dimensional (3D) hydrogeological information that affects the HER to a two-dimensional (2D) map. It was found that the main factors affecting the HER were groundwater flow velocity, subsurface temperature, and thermal conductivity. The response surface methodology was utilized to approximate the HER using the above-mentioned three parameters. The estimated HER showed very strong agreement with that calculated by the GHE models. The application of the estimation formula to the simulation of the 3D groundwater flow and heat transport model of the Sendai Plain (Japan) better reflects the hydrogeological information of the regional model than conventional maps. The proposed method improves the spatial resolution of maps and allows for the easy creation of the HER estimation formula.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Proposal for a Method Predicting Suitable Areas for Installation of Ground-Source Heat Pump Systems Based on Response Surface Methodology

Kaneko¹,

Tomigashi²,

Ishihara³

et al. 2020

Energies

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“…Cappoza et al [21] verified the moving infinite line source theory in a real case study and used it for boreholes heat transfer simulations. Besides, some numerical models were proposed [22,23] with the aid of some simulation software such as the COMSOL multiphysics and the FLUENT, which can account for some complexities of the heat transfer problems. However, simulating the heat transfer process of a large GHE with many boreholes usually requires large numbers of grids and long calculating time during the calculating.…”

Section: Introductionmentioning

confidence: 99%

Research on heat transfer characteristics and borehole field layout of ground heat exchangers to alleviate thermal accumulation with groundwater advection

Sun

2021

THERM SCI

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The heat transfer performance of ground heat exchanger is significant to the ground source heat pump. The soil thermal parameters, the groundwater advection and the different borehole field layout are important factors to affect the performance of ground heat exchanger. Therefore, the influence of groundwater advection velocity, soil physical parameters and different borehole field layout on the soil temperature distribution and evolution around the ground heat exchanger has been analyzed and studied with unbalanced seasonal thermal load based on the moving finite line heat source model with groundwater advection. The results show that the heat accumulation is easy to occur as the time develops when the groundwater advection is taken into consideration. No matter what type of geological condition is employed, a reasonable borehole field layout can effectively avoid heat accumulation problems under the condition of keeping the same amount boreholes without changing the original ground area. The borehole field layout dispersed along the center line of the advection and concentrated in the advection downstream relatively can effectively reduce the heat accumulation.

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“…There are many technologies to convert solar energy into a usable energy for human needs, but this energy has to be available even during the period of low sunlight (Stojanović and Akander, 2010). To face this issue, one solution is solar energy storage in a proper medium during summer, to be preserved and later discharged for utilization in the demanded period for example space heating in winter (Xu et al, 2014 andLi et al, 2018). Several studies have demonstrated the relevance of this method that already used in geologic storage medium.…”

Section: Introductionmentioning

confidence: 99%

Thermo-hydro-mechanical behavior of an embankment thermal storage

Lahoori

Rosin-Paumier

Masrouri

2021

JGS Special Publication

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In geotechnical engineering, thermal energy storage in embankments can be considered as a new economically efficient, and environmentally friendly structure for space heating. In these structures, horizontal heat exchanger tubes could be installed inside the different layers of compacted soil to store the heat in the medium during the summer, to be extracted in the winter. Seasonally temperature variations caused by heat exchangers can affect Thermo-Hydro-Mechanical (THM) properties of the compacted soil in the embankment. Both the short and long term behavior of this compacted soil should be investigated. The aim of this study was to investigate the effect of temperature variations in the range of 5° to 50 °C, on THM behavior of a compacted sandy lean clay in saturated state. To achieve this, temperature-controlled oedometric and direct shear tests were performed. The results showed that, the effect of the temperature on mechanical properties are more pronounced under a vertical stress higher than the yield stress. Heating changed the void ratio during consolidation phase but has a negligible effect on the shear characteristics. The results also showed that the cooling slightly changed the shear parameters.

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Numerical simulation of ground source heat pump systems considering unsaturated soil properties and groundwater flow

Cited by 69 publications

References 43 publications

Proposal for a Method Predicting Suitable Areas for Installation of Ground-Source Heat Pump Systems Based on Response Surface Methodology

Proposal for a Method Predicting Suitable Areas for Installation of Ground-Source Heat Pump Systems Based on Response Surface Methodology

Research on heat transfer characteristics and borehole field layout of ground heat exchangers to alleviate thermal accumulation with groundwater advection

Thermo-hydro-mechanical behavior of an embankment thermal storage

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