scholarly journals Numerical Modeling and Conjugate Heat Transfer Analysis of Single U-Tube Vertical Borehole Heat Exchangers

2020 ◽  
Author(s):  
Talha Khan
Keyword(s):  
Heat Transfer ◽  
Numerical Modeling ◽  
Heat Exchangers ◽  
Conjugate Heat Transfer ◽  
Heat Transfer Analysis ◽  
Borehole Heat Exchangers ◽  
Vertical Borehole

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.

Heat transfer analysis of U-type deep borehole heat exchangers of geothermal energy

2021 ◽  
Vol 237 ◽  
pp. 110794
Author(s):  
Wenke Zhang ◽  
Jianhua Wang ◽  
Fangfang Zhang ◽  
Wei Lu ◽  
Ping Cui ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Exchangers ◽  
Geothermal Energy ◽  
Heat Transfer Analysis ◽  
Deep Borehole ◽  
Borehole Heat Exchangers
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