Results 51 to 60 of about 369 (185)

The deeper the better? A thermogeological analysis of medium-deep borehole heat exchangers in low-enthalpy crystalline rocks

Geothermal Energy, 2022
The energy sector is undergoing a fundamental transformation, with a significant investment in low-carbon technologies to replace fossil-based systems. In densely populated urban areas, deep boreholes offer an alternative over shallow geothermal systems,
Kaiu Piipponen, Annu Martinkauppi, Kimmo Korhonen, Sami Vallin, Teppo Arola, Alan Bischoff, Nina Leppäharju   +6 more
doaj   +1 more source

Permafrost Distribution in the Canadian Rockies: Key Variables Influencing Patch‐Scale Variability

Permafrost and Periglacial Processes, Volume 37, Issue 3, Page 372-390, July/September 2026.
ABSTRACT The spatial distribution of permafrost in mountainous regions is influenced by various factors such as topography, climate, vegetation, and substrate. Despite the existence of comprehensive permafrost maps at national and global levels, they fail to accurately represent the patch‐scale (e.g., < 25 m) permafrost distribution in characteristic ...
Gerardo Zegers, Masaki Hayashi, Pablo A. Mendoza   +2 more
wiley   +1 more source

Spatial Variability of Permafrost and Active Layer Thickness in a Forested Hillslope of the Taiga Shield

Permafrost and Periglacial Processes, Volume 37, Issue 3, Page 306-322, July/September 2026.
ABSTRACT Under continued climate warming, understanding present‐day permafrost distribution and the controls on ground thaw are critical for predicting permafrost thaw trajectories and associated implications. This study presents a high‐resolution investigation of permafrost extent and active layer thickness (ALT) across a coniferous forested hillslope
Alana Muenchrath, Christopher Spence, Andrew Ireson   +2 more
wiley   +1 more source

Deciphering Freeze–Thaw Dynamics In Rockwalls: A Novel Approach for High Accuracy Regional‐Scale Modeling

Permafrost and Periglacial Processes, Volume 37, Issue 3, Page 430-448, July/September 2026.
ABSTRACT Using a large and novel array of instruments on five rockwalls in northern Gaspesia, their respective surface energy balances were calculated and their thermal regimes were measured and modeled to depths exceeding the seasonal frost penetration.
Tom Birien, Francis Gauthier
wiley   +1 more source

Ground Source Heat Pump in Heating System with Electronics Monitoring [PDF]

Journal of Electrical and Electronics Engineering, 2013
The monitoring system is implemented for a ground coupled heat pump in heating/ system. The borehole heat exchangers – which are 150 m long - are filled with a mixture of water and ethilene glycol calledbrine.
NEAMŢU Ovidiu, ROŞCA Marcel, BENDEA Codruţa, CODREAN Marius   +3 more
doaj  

Porosity and Permeability of Very Young Oceanic Crust: Implications for Hydrothermal Circulation at Mid‐Ocean Ridges

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 7, July 2026.
Abstract Porosity and permeability are crucial factors influencing hydrothermal flow in the oceanic crust. This paper provides a comprehensive overview of measurements and estimates of porosity and permeability. Although scientific drilling projects have yielded direct measurements of these properties, available data remain limited, particularly for ...
Weihao Lyu, Michele Paulatto, Carl Jacquemyn, Matthew D. Jackson, Yanghua Wang   +4 more
wiley   +1 more source

THERMAL PERFORMANCES OF VERTICAL GROUND HEAT EXCHANGERS IN DIFFERENT CONDITIONS [PDF]

Journal of Engineering Science and Technology, 2016
This study investigates thermal performance of vertical ground heat exchangers (GHEs) with different inlet water temperatures and borehole depths. The performances of three types of GHEs namely U-tube, double-tube and multi-tube GHEs are evaluated by ...
JALALUDDIN, AKIO MIYARA
doaj  

Retrogressive Thaw Slump Morphology and Dynamics in Saline Permafrost in Northeast Greenland

Journal of Geophysical Research: Earth Surface, Volume 131, Issue 7, July 2026.
Abstract Saline permafrost occupies a significant portion of permafrost in the Northern Hemisphere and extends several kilometers inland from the present Arctic coastline. However, its thermal conditions, mechanical degradation and geomorphological impacts are poorly understood.
S. Eppinger, T. H. Lorentzen, M. Angelopoulos, T. Ingeman‐Nielsen, D. A. Rudd, M. Marcer, M. Krautblatter   +6 more
wiley   +1 more source

Stable Water Isotopes Improve Calibration and Flow Path Identification in Integrated Hydrological Models

Water Resources Research, Volume 62, Issue 7, July 2026.
Abstract Hydrological models often exhibit equifinality, where different parameter sets produce similar hydrometric outputs but alter internal catchment processes and partitioning. Incorporating new information amongst calibration targets helps narrow the range of viable models.
Omar Ashraf Nimr, Hannu Marttila, Anna Autio, Pertti Ala‐Aho   +3 more
wiley   +1 more source

Relation Between Mean Fluid Temperature and Outlet Temperature for Single U-Tube Boreholes

Energies, 2020
Ground-coupled heat pump (GCHP) systems usually utilize buried vertical heat exchangers, named borehole heat exchangers (BHEs). The accurate design or simulation of a GCHP system requires the calculation of the time-dependent outlet temperature from the ...
Aminhossein Jahanbin, Claudia Naldi, Enzo Zanchini   +2 more
doaj   +1 more source