Thermal short circuit on groundwater heat pump

Galgaro, Antonio; Cultrera, Matteo

doi:10.1016/j.applthermaleng.2013.03.011

Cited by 50 publications

(20 citation statements)

References 40 publications

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“…Table 1 reports the complete parameter set, including default values and the ranges considered in this analysis. These parameters are representative of aquifers in which the application of the geothermal system hypothesised in this work could be considered [9][10][11]. The relative weight of each parameter was assessed by calculating the "sensitivity index" (SI), as suggested by Heiselberg et al [40], defined as:…”

Section: Model Setupmentioning

confidence: 99%

“…The energy efficiency of a GSHP strongly depends on site-specific properties of the ground, for both Borehole Heat Exchangers (BHEs) [4][5][6][7][8] and Ground Water Heat Pumps (GWHPs) [9][10][11][12]. GWHPs exchange heat with groundwater extracted through one or multiple water wells, and are increasingly employed as an air conditioning system, especially for large commercial and public buildings [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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Thermal Impact Assessment of Groundwater Heat Pumps (GWHPs): Rigorous vs. Simplified Models

et al. 2017

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Groundwater Heat Pumps (GWHPs) are increasingly adopted for air conditioning in urban areas, thus reducing CO 2 emissions, and this growth needs to be managed to ensure the sustainability of the thermal alteration of aquifers. However, few studies have addressed the propagation of thermal plumes from open-loop geothermal systems from a long-term perspective. We provide a comprehensive sensitivity analysis, performed with numerical finite-element simulations, to assess how the size of the thermally affected zone is driven by hydrodynamic and thermal subsurface properties, the vadose zone and aquifer thickness, and plant setup. In particular, we focus the analysis on the length and width of thermal plumes, and on their time evolution. Numerical simulations are compared with two simplified methods, namely (i) replacing the time-varying thermal load with its yearly average and (ii) analytical formulae for advective heat transport in the aquifer. The former proves acceptable for the assessment of plume length, while the latter can be used to estimate the width of the thermally affected zone. The results highlight the strong influence of groundwater velocity on the plume size and, especially for its long-term evolution, of ground thermal properties and of subsurface geometrical parameters.

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Section: Model Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal Impact Assessment of Groundwater Heat Pumps (GWHPs): Rigorous vs. Simplified Models

et al. 2017

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“…A commercial building in Rovigo, located in the Po River Plain (Italy), was chosen by Galgaro as a case study [14], and suggested that there are several heating/cooling timetables that reduce the risk of thermal feedback among wells and that these timetables may prevent the GWHP system from becoming uneconomical and energetically inefficient. Händel et al [9] developed a regional model based on the aquifer at Leibnitzer Feld (Austria), and found the geothermal energy systems in the groundwater have no lasting temperature effects.…”

Section: Introductionmentioning

confidence: 99%

Impact of Boundary Conditions on a Groundwater Heat Pump System Design in a Shallow and Thin Aquifer near the River

et al. 2017

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Abstract:The exploitation of shallow geothermal energy through a groundwater heat pump (GWHP) is always limited to thick and deep aquifers containing abundant water with a relatively stable temperature. Unfortunately, aquifers in hilly regions which occupy two thirds of China are usually thin and shallow. The boundary conditions in those hilly areas affect the groundwater flow that is used for geothermal energy production. To quantify the impact of boundary conditions on the shallow geothermal energy development, a shallow and thin aquifer near the Qingyi River in Anhui Province was chosen as a case study, and a three-dimensional heat-water model was developed using FEFLOW. The impact of the boundary conditions on the hydrodynamic and temperature fields of the aquifer was analyzed by using the developed model. Furthermore, the well locations of a pumping-recharging system near the river correspond to three different modes of pumping-recharging well layouts that were optimized based on the changes of pumping water temperature and the maximum drawdown. The simulation results indicated that the influence of atmospheric temperature on groundwater temperature is negligible below a depth of 11 m. When the river level is above 28 m, the optimal scheme of pumping-only was used (without considering recharging wells) with a certain distance from the river. This scheme not only operates efficiently, but also reduces the operation cost.

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“…With the increasing demand for renewable energy, groundwater heat pump (GWHP) system is being used more and more widely in the world, especially in Europe and North America. This reason of that phenomenon results from the increasing costs of conventional energy and improving the use of renewable energy with low carbon dioxide production [1] . GWHP system is a doublet well open-loop system, pumps groundwater from an extraction well, exploits groundwater calories, and finally dismisses groundwater into an injection well in the same aquifer [2] .…”

Section: Introductionmentioning

confidence: 99%

Impacts of Groundwater Heat Pump System on Microorganism Growth in Beijing Plain, China

Li¹,

Liu²,

Li³

et al. 2016

Proceedings of the 2016 International Conference on Mechatronics Engineering and Information Technology

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Here one demonstration project of groundwater heat pump (GWHP) system in Beijing plain, China, was selected to study impact of temperature, pH, and ratio of carbon and nitrogen in groundwater on the growth of microorganism. Results showed that pH, and ratio of carbon and nitrogen had little influence, while temperature played an important role. When temperature was higher or lower than 13.2 0 C, the amount of Escherichia coli and bacteria showed a decreasing trend roughly consistent with the normal distribution. Meanwhile, based on the monitored data, the relationship between groundwater temperature and the capacity of E. coli and bacteria were summarized.

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Thermal short circuit on groundwater heat pump

Cited by 50 publications

References 40 publications

Thermal Impact Assessment of Groundwater Heat Pumps (GWHPs): Rigorous vs. Simplified Models

Thermal Impact Assessment of Groundwater Heat Pumps (GWHPs): Rigorous vs. Simplified Models

Impact of Boundary Conditions on a Groundwater Heat Pump System Design in a Shallow and Thin Aquifer near the River

Impacts of Groundwater Heat Pump System on Microorganism Growth in Beijing Plain, China

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