Results 31 to 40 of about 204,167 (205)

Hybrid semi analytical method for geothermal U shaped heat exchanger

Case Studies in Thermal Engineering, 2018
In this paper, convective-conductive heat transfer processes between the all components of geothermal borehole heat exchanger (BHE) such as pipe-in, pipe-out and grout have been studied.
P. Jalili, D.D. Ganji, S.S. Nourazar
doaj   +1 more source

Investigation of Steady-State Heat Extraction Rates for Different Borehole Heat Exchanger Configurations from the Aspect of Implementation of New TurboCollector™ Pipe System Design

Energies, 2019
When considering implementation of shallow geothermal energy as a renewable source for heating and cooling of buildings, special care should be taken in the hydraulic design of the borehole heat exchanger system.
Tomislav Kurevija, Adib Kalantar, Marija Macenić, Josipa Hranić   +3 more
doaj   +1 more source

Pipe materials for borehole heat exchangers

European Geothermal Congress 2016, 2016
This paper investigates and evaluates alternative options of higher thermal conductivity as borehole heat exchanger (BHE) piping materials, such as mild steel, galvanized steel, various coating options, stainless steel, copper and its alloys, aluminum, titanium, as well as reinforced polymers and other plastic materials including thermally enhanced ...
Mendrinos, Dimitrios, Katsantonis, Spyridon, Karytsas, Constantine   +2 more
openaire   +1 more source

Impact of Employing Hybrid Nanofluids as Heat Carrier Fluid on the Thermal Performance of a Borehole Heat Exchanger

Energies, 2021
In this numerical study, 4 types of hybrid nanofluid, including Ag-MgO/water, TiO2-Cu/water, Al2O3-CuO/water, and Fe3O4-multi-wall carbon nanotube/water, have been considered potential working fluid in a single U-tube borehole heat exchanger.
H. Javadi, J. Urchueguía, S. S. M. Ajarostaghi, Borja Badenes   +3 more
semanticscholar   +1 more source

Hybridisation of geothermal source with ORC-based load loop for uninterrupted generation of steady power

International Journal of Sustainable Energy, 2022
The dynamic performance of a hybrid power plant configuration comprising of a ground heat exchanger and an organic Rankine cycle (ORC) for power generation at the load end is studied.
Anukool Choudhary, Rudrodip Majumdar, Sandip K. Saha   +2 more
doaj   +1 more source

Comparison of simulation tools for optimizing borehole heat exchanger field operation

Geothermal Energy
Model predictive control (MPC) is a promising approach for optimizing the performance of borehole heat exchangers (BHEs) in ground-source heat pump systems. The central element of MPC is the forward model that predicts the thermal dynamics in the ground.
Elisa Heim, Phillip Stoffel, Stephan Düber, D. Knapp, A. Kümpel, Dirk Müller, N. Klitzsch   +6 more
semanticscholar   +1 more source

A novel method of acquiring geothermal energy from unconsolidated sandstone reservoir by multi-directional wells deep borehole heat exchanger

Case Studies in Thermal Engineering, 2021
The clogging problem during injection seriously limits the development and utilization of geothermal resources in unconsolidated sandstone area.
Yanxin Wang, Xianbiao Bu
doaj   +1 more source

Thermal stresses in borehole heat exchangers

International Journal for Numerical and Analytical Methods in Geomechanics, 2015
SummaryThe backfilling materials of borehole heat exchangers (BHE), particularly the grout material, must provide a suitable thermal contact and ensure durability to the induced thermal stresses because of the heat loading. In this paper, the thermal stresses that occurred in BHEs because of heat injection or extraction is investigated with an ...
Erol, Selcuk, François, Bertrand
openaire   +2 more sources

Measurements and Design Calculations for a Deep Coaxial Borehole Heat Exchanger in Aachen, Germany

International Journal of Geophysics, 2013
This study aims at evaluating the feasibility of an installation for space heating and cooling the building of the university in the center of the city Aachen, Germany, with a 2500 m deep coaxial borehole heat exchanger (BHE). Direct heating the building
Lydia Dijkshoorn, Simon Speer, Renate Pechnig   +2 more
doaj   +1 more source

Numerical Analysis of Inlet–Outlet Leg Barriers in Vertical Borehole Heat Exchangers: A Strategy to Mitigate the Thermal Resistance

Geotechnics
The efficiency of heat transfer through borehole heat exchangers is influenced by the thermal resistances of both the borehole and the surrounding soil. Optimizing these resistances can improve the heat transfer performance and reduce system costs.
Asfia Nishat, Hossam Abuel-Naga
doaj   +1 more source