Results 271 to 280 of about 136,634 (354)

Borehole instabilities in the KTB main borehole

Journal of Geophysical Research: Solid Earth, 1997
Borehole instability has been a central problem for drilling operations and borehole measurements within the German Continental Deep Drilling Project (KTB) main borehole, which has been drilled entirely through crystalline rocks, mostly paragneisses and metabasites.
Borm, G., Engeser, B., Hoffers, B., Kutter, H., Lempp, C.   +4 more
openaire   +2 more sources

Accuracy of borehole thermal resistance calculation methods for grouted single U-tube ground heat exchangers

Applied Energy, 2017
Saqib Javed, Jeffrey D Spitler
exaly   +2 more sources

Automatic detection of fractures and breakouts patterns in acoustic borehole image logs using fast-region convolutional neural networks

, 2020
Borehole acoustic image logs present meaningful information about some petrophysical properties of a reservoir. The identification of these features, in addition to several supplementary data are very important to achieve a valid characterization of the ...
L. Dias, C. Bom, E. Faria, M. Valentín, M. Correia, M. Albuquerque, M. Albuquerque, Juliana. M. Coelho   +7 more
semanticscholar   +1 more source

Thermal evaluation of coaxial deep borehole heat exchangers

Renewable Energy, 2016
Henrik Holmberg, Erling Næss
exaly   +2 more sources

Deep coaxial borehole heat exchanger: Analytical modeling and thermal analysis

Energy, 2019
Borehole heat exchangers (BHEs) are often used to harvest geothermal energy at shallower depths. The standard increase in temperature with depth is generally ignored.
Yong Luo, Hongshan Guo, F. Meggers, Ling Zhang   +3 more
semanticscholar   +1 more source

Thermal response tests on deep borehole heat exchangers with geothermal gradient

, 2020
Vertical borehole heat exchangers are often coupled to heat pumps to transfer heat between the ground and the inside of a building. A transient heat transfer model has been developed for a coaxial borehole while taking into account the geothermal ...
R. Beier
semanticscholar   +1 more source

Large-scale living laboratory of seasonal borehole thermal energy storage system for urban district heating

, 2020
To obtain a better understanding of the characteristics of large-scale seasonal borehole thermal energy storage (BTES), a living laboratory was developed in Chifeng, China.
F. Guo, Xiaoyue Zhu, Junyue Zhang, Xudong Yang   +3 more
semanticscholar   +1 more source

Field test and numerical investigation on deep coaxial borehole heat exchanger based on distributed optical fiber temperature sensor

, 2020
The thermal performance of DCBHE is superior to conventional borehole heat exchanger (BHE) systems. In the current study, the field test using a DCBHE (2044 m) is conducted, based on a distributed optical fiber temperature sensor (DOFTS). The temperature
Yibin Huang, Yanjun Zhang, Yang-yang Xie, Yu Zhang, Xuefeng Gao, Jingchen Ma   +5 more
semanticscholar   +1 more source

Improved analytical modeling and system performance evaluation of deep coaxial borehole heat exchanger with segmented finite cylinder-source method

, 2020
The deep borehole heat exchanger is attracting more and more attention due to its higher performance. But there is no suitable analytical model for its fast simulation and system design.
Yongqiang Luo, Jinghua Yu, Tian Yan, Ling Zhang, Xiaobo Liu   +4 more
semanticscholar   +1 more source

Thermal performance analysis on the composition attributes of deep coaxial borehole heat exchanger for building heating

, 2020
Geothermal energy has considerable development potential in space heating. As a method of heat extraction, the deep coaxial borehole heat exchanger has superior thermal performance to that of the conventional borehole heat exchanger.
Yibin Huang, Yanjun Zhang, Yangyang Xie, Yu Zhang, Xuefeng Gao   +4 more
semanticscholar   +1 more source