scholarly journals Borehole Heat Exchangers: heat transfer simulation in the presence of a groundwater flow

2014 ◽  
Vol 501 ◽  
pp. 012033 ◽  
Author(s):  
A Angelotti ◽  
L Alberti ◽  
I La Licata ◽  
M Antelmi
Keyword(s):  
Heat Transfer ◽  
Groundwater Flow ◽  
Heat Exchangers ◽  
Heat Transfer Simulation ◽  
Borehole Heat Exchangers

scholarly journals Numerical modelling of vertical borehole heat exchangers performance under Lithuanian Quaternary conditions

Baltica ◽  
2019 ◽  
Vol 31 (2) ◽  
pp. 146-153
Author(s):  
Audrius Indriulionis ◽  
Žygimantas Palaitis ◽  
Petras Šinkūnas ◽  
Robert Mokrik
Keyword(s):  
Heat Transfer ◽  
Numerical Model ◽  
Groundwater Flow ◽  
Heat Exchangers ◽  
Heat Transfer Model ◽  
Capital City ◽  
Transfer Model ◽  
Practical Tool ◽  
Borehole Heat Exchangers ◽  
Vertical Borehole

The vertical borehole heat exchangers were surrounded by the heterogeneous multilayered geological environment and groundwater flow that affected the performance of borehole plants. In this paper, the field investigation of vertical borehole ground heat exchangers in capital city Vilnius (Visoriai), Lithuania is presented. The numerical heat transfer model considering seven different geological strata was developed using the cylindrical heat sink model for vertical borehole inside by solving the soil mass and heat transfer equations with groundwater flow. The numerical multilayered ground vertical borehole heat transfer model was calculated and validated by in-situ thermal response test data. The numerical model results were also compared with the homogeneous finite difference model expressed by the temperature response functions (well known as “g-functions”). The practical realization of g-functions was designed in the Earth Energy Designer as a practical tool for geoengineers designing the vertical borehole plants. The temperature profiles at borehole wall at different heating times were presented and explored together with relative errors. The numerical model will be used as a practical tool for the Lithuanian Geological Survey under the Ministry of Environment to estimate the underground conditions for the consumption of shallow geothermal energy.

Thermal response test analysis for U-pipe vertical borehole heat exchangers under groundwater flow conditions

2021 ◽  
Vol 165 ◽  
pp. 391-404
Author(s):  
Teresa Magraner ◽  
Álvaro Montero ◽  
Antonio Cazorla-Marín ◽  
Carla Montagud-Montalvá ◽  
Julio Martos
Keyword(s):  
Groundwater Flow ◽  
Heat Exchangers ◽  
Thermal Response ◽  
Thermal Response Test ◽  
Flow Conditions ◽  
Test Analysis ◽  
Response Test ◽  
Borehole Heat Exchangers ◽  
Vertical Borehole

scholarly journals Impact of Groundwater Flow and Energy Load on Multiple Borehole Heat Exchangers

Ground Water ◽  
2014 ◽  
Vol 53 (4) ◽  
pp. 558-571 ◽  
Author(s):  
S. Emad Dehkordi ◽  
Robert A. Schincariol ◽  
Bo Olofsson
Keyword(s):  
Groundwater Flow ◽  
Heat Exchangers ◽  
Borehole Heat Exchangers

scholarly journals Simulation Analysis on the Heat Performance of Deep Borehole Heat Exchangers in Medium-Depth Geothermal Heat Pump Systems

Energies ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 754 ◽  
Author(s):  
Jiewen Deng ◽  
Qingpeng Wei ◽  
Shi He ◽  
Mei Liang ◽  
Hui Zhang
Keyword(s):  
Heat Transfer ◽  
Heat Pump ◽  
Heat Exchangers ◽  
Geothermal Energy ◽  
Heat Transfer Performance ◽  
Deep Borehole ◽  
Geothermal Heat ◽  
Temperature Heat ◽  
Geothermal Heat Pump ◽  
Borehole Heat Exchangers

Deep borehole heat exchangers (DBHEs) extract heat from the medium-depth geothermal energy with the depth of 2–3 km and provide high-temperature heat source for the medium-depth geothermal heat pump systems (MD-GHPs). This paper focuses on the heat transfer performance of DBHEs, where field tests and simulation are conducted to analyze the heat transfer process and the influence factors. Results identify that the heat transfer performance is greatly influenced by geothermal properties of the ground, thermal properties and depth of DBHEs and operation parameters, which could be classified into external factors, internal factors and synergic adjustment. In addition, the long-term operation effects are analyzed with the simulation, results show that with inlet water temperature setting at 20 °C and flow rate setting at 6.0 kg/s, the average outlet water temperature only drops 0.99 °C and the average heat extraction drops 9.5% after 20-years operation. Therefore, it demonstrates that the medium-depth geothermal energy can serve as the high-temperature heat source for heat pump systems stably and reliably. The results from this study can be potentially used to guide the system design and optimization of DBHEs.

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