Results 131 to 140 of about 204,167 (205)

Modeling insulated borehole heat exchangers

Environmental Earth Sciences, 2016
In the heating sector, borehole heat exchangers have become popular for supplying renewable energy. They tap into the subsurface to extract geothermal energy for heating purposes. For advanced applications, borehole heat exchangers require insulation in the upper part of the borehole either to meet legal requirements or to improve their performance.
Daniel Otto Schulte, Bastian Welsch, Anke Boockmeyer, Wolfram Rühaak, Kristian Bär, Sebastian Bauer, Ingo Sass   +6 more
openaire   +1 more source

Numerical investigation on the capacity and efficiency of a deep enhanced U-tube borehole heat exchanger system for building heating

, 2021
Deep geothermal energy has become widely exploited in recent years through the use of closed loop systems for building heating. Intended to meet high heating demand in densely populated neighbourhoods, an enhanced U-tube borehole heat exchanger (EUBHE ...
Chaofan Chen, Wanlong Cai, D. Naumov, Kun Tu, Hongwei Zhou, Yuping Zhang, O. Kolditz, H. Shao   +7 more
semanticscholar   +1 more source

Borehole thermal resistance of U-tube borehole heat exchanger

Géotechnique Letters, 2016
Thermal resistance of U-tube borehole heat exchangers (UBHE) is one of the factors that controls their design. Several equations are available in the literature to estimate the thermal resistance of UBHE. However, these equations produce different results and no definitive recommendation is available regarding their validity.
H. M. Abuel-Naga, R. R. Al-Chalabi
openaire   +1 more source

Effects of temperature-dependent property variations on the output capacity prediction of a deep coaxial borehole heat exchanger

Renewable Energy, 2021
This study aims to understand the effects of property variations on prediction discrepancies in the output capacity (i.e., output power) of deep coaxial borehole heat exchangers under different operational conditions.
Xincheng Hu, Jonathan C. Banks, Yunting Guo, Guangping Huang, W. Liu   +4 more
semanticscholar   +1 more source

Numerical modeling of a coaxial borehole heat exchanger to exploit geothermal energy from abandoned petroleum wells in Hinton, Alberta

, 2020
Deep petroleum wells are often associated with high bottom-hole temperatures and can provide a cost-effective way to produce geothermal energy. The goal of this study is to develop a reliable simulation model to demonstrate the feasibility of extracting ...
Xincheng Hu, Jonathan C. Banks, Lin-ping Wu, W. Liu   +3 more
semanticscholar   +1 more source

Theoretical Model of Borehole Heat Exchanger

Journal of Energy Resources Technology, 2004
The paper deals with the possible use of existing oil wells for geothermal energy production. A mathematical model, describing the process of exploitation of a borehole heat exchanger, has been worked out. It was used for determining energy efficiency, employing the main parameter, i.e., flow of produced heat energy.
Tomasz Śliwa, Andrzej Gonet
openaire   +1 more source

Reconstruction of experimental thermal response functions from monitoring data of a borehole heat exchanger field

2024 Research Conference Proceedings of the IGSHPA
Thermal response functions are commonly used to describe the heat exchange capability of ground heat exchangers. When convolved with the ground thermal load, they allow for a quick and efficient prediction of the temperature evolution. Typically, thermal
Elisa Heim, Philippe Pasquier, Gabriel Dion, Phillip Stoffel, N. Klitzsch   +4 more
semanticscholar   +1 more source

Regeneration of shallow borehole heat exchanger fields: A literature review

Energy and Buildings
borehole
Xenia Kirschstein, Max Ohagen, Joscha Reber, P. Vardon, N. Bishara   +4 more
semanticscholar   +1 more source

Borehole heat exchanger with nanofluids as heat carrier

Geothermics, 2018
Abstract This paper presents numerical study on the use of nanofluids to replace conventional ethylene glycol/water mixture as heat carrier in a BoreHole Heat Exchanger. Nanofluids contain suspended metallic nanoparticles: increasing their concentration, in comparison to the base fluid, the thermal conductivity increases and the volumetric heat ...
Giuseppe Diglio, Carlo Roselli, Maurizio Sasso, Umavathi Jawali Channabasappa   +3 more
openaire   +1 more source

FREEZING PROBLEMS IN BOREHOLE HEAT EXCHANGERS

2007
There are approximately 300,000 borehole systems in Sweden with an annual growth rate of 30,000 systems. Such borehole systems are mainly used for heating of single family houses but in recent years several hundred larger systems, for both heating and cooling, have been constructed.
Bo Nordell, Anna-Karin Ahlström
openaire   +1 more source