Results 11 to 20 of about 369 (185)

Thermal Response Measurement and Performance Evaluation of Borehole Heat Exchangers: A Case Study in Kazakhstan

Energies, 2022
The purpose of the present work was to determine the thermal performance of borehole heat exchangers, considering the influences of their geometric configurations and the thermophysical properties of the soil, grout and pipe wall material.
Tangnur Amanzholov, Abzal Seitov, Abdurashid Aliuly, Yelnar Yerdesh, Mohanraj Murugesan, Olivier Botella, Michel Feidt, Hua Sheng Wang, Yerzhan Belyayev, Amankeldy Toleukhanov   +9 more
doaj   +1 more source

Uncertainty quantification of borehole heat exchanger design length based on a global sensitivity analysis [PDF]

E3S Web of Conferences, 2023
Ground heat exchangers are essential components of ground-source heat pump systems. One of the most-used ground heat exchanger types is a borehole heat exchanger (BHE).
Shin Euntak, Kim Yoonseong, Kim Young-sang, Choi Wonjun   +3 more
doaj   +1 more source

Geothermal power based ULTDH for cooling and heating purposes [PDF]

E3S Web of Conferences, 2019
Ultra-low temperature district heating systems facilitate use of waste and renewable heat sources. The article presents a possible scheme of operation and optimisation of small ultra-low temperature district heating system consisting of waste heat source,
Ciapała Bartłomiej, Janowski Mirosław
doaj   +1 more source

Dynamic and Static Investigation of Ground Heat Exchangers Equipped with Internal and External Fins

Applied Sciences, 2020
Using fins on the inner and outer surfaces of pipes is one method to improve the heat transfer rate of ground heat exchangers (GHEs), thereby reducing the borehole depth and construction and operation costs.
Atefeh Maleki Zanjani, Kobra Gharali, Armughan Al-Haq, Jatin Nathwani   +3 more
doaj   +1 more source

Investigation of the Heat Transfer Performance of Multi-Borehole Double-Pipe Heat Exchangers in Medium-Shallow Strata

Energies, 2022
Just as the double-pipe heat exchanger is being utilized in an increasing number of applications, its research content is also deepening. For this paper, based on the air-conditioning cold and heat source project of a building in Handan, Hebei Province ...
Wenjing Li, Wenke Zhang, Zhenxing Li, Haiqing Yao, Ping Cui, Fangfang Zhang   +5 more
doaj   +1 more source

Research on Fresh and Hardened Sealing Slurries with the Addition of Magnesium Regarding Thermal Conductivity for Energy Piles and Borehole Heat Exchangers

Energies, 2021
Currently, renewable energy is increasingly important in the energy sector. One of the so-called renewable energy sources is geothermal energy. The most popular solution implemented by both small and large customers is the consumption of low-temperature ...
Tomasz Sliwa, Tomasz Kowalski, Dominik Cekus, Aneta Sapińska-Śliwa   +3 more
doaj   +1 more source

The analysis of long-term borehole heat exchanger system exploitation

Computer Assisted Methods in Engineering and Science, 2017
The key issue in designing borehole heat exchangers (BHE) is the long-term performance of the ground source heat pump (GSHP) systems. The performance directly reflects economic profitability and depends on a large number of parameters including rock ...
Marek Jaszczur, Tomasz Śliwa
doaj   +1 more source

Drilling Deeper in Shallow Geoexchange Heat Pump Systems—Thermogeological, Energy and Hydraulic Benefits and Restraints

Energies, 2023
In the last decade, due to climate change concerns and new environmental regulations in the EU, there was a tremendous rise in installed heat pump systems in new homes and buildings.
Tomislav Kurevija, Marija Macenić, Martina Tuschl   +2 more
doaj   +1 more source

An Analytical Model for Transient Heat Transfer with a Time-Dependent Boundary in Solar- and Waste-Heat-Assisted Geothermal Borehole Systems: From Single to Multiple Boreholes

Applied Sciences, 2021
With the increasing engineering applications of geothermal borehole heat exchangers (BHEs), accurate and reliable mathematical models can help advance their thermal design and operations. In this study, an analytical model with a time-dependent heat flux
Mohammed A. Hefni, Minghan Xu, Ferri Hassani, Seyed Ali Ghoreishi-Madiseh, Haitham M. Ahmed, Hussein A. Saleem, Hussin A. M. Ahmed, Gamal S. A. Hassan, Khaled I. Ahmed, Agus P. Sasmito   +9 more
doaj   +1 more source

Simulation-Based Comparison Between the Thermal Behavior of Coaxial and Double U-Tube Borehole Heat Exchangers

Energies, 2019
In this study, the thermal behavior of the coaxial and double U borehole heat exchangers was investigated using numerical simulations in both the long- and short-term.
Davide Quaggiotto, Angelo Zarrella, Giuseppe Emmi, Michele De Carli, Luc Pockelé, Jacques Vercruysse, Mario Psyk, Davide Righini, Antonio Galgaro, Dimitrios Mendrinos, Adriana Bernardi   +10 more
doaj   +1 more source