Browsing NTNU Open by Author "Frengstad, Bjørn S."
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Design considerations for borehole thermal energy storage (BTES): A review with emphasis on convective heat transfer
Skarphagen, Helge; Banks, David; Frengstad, Bjørn S.; Gether, Harald (Journal article; Peer reviewed, 2019)Borehole thermal energy storage (BTES) exploits the high volumetric heat capacity of rock-forming minerals and pore water to store large quantities of heat (or cold) on a seasonal basis in the geological environment. The ... -
Design of Groundwater Heat Pump Systems. Principles, Tools, and Strategies for Controlling Gas and Precipitation Problems
Gjengedal, Sondre; Stenvik, Lars Aaberg; Storli, Pål-Tore Selbo; Ramstad, Randi Kalskin; Hilmo, Bernt Olav; Frengstad, Bjørn S. (Journal article; Peer reviewed, 2019)The utilization of groundwater heat pump systems is increasing in Norway, which are currently widely employed for heating and cooling applications in the town center of Melhus. The investigations of the Melhus installations ... -
Fouling and clogging surveillance in open loop GSHP systems: A systematic procedure for fouling and clogging detection in the whole groundwater circuit
Gjengedal, Sondre; Ramstad, Randi Kalskin; Hilmo, Bernt Olav; Frengstad, Bjørn S. (Journal article; Peer reviewed, 2020)Fouling and clogging are some of the major water quality problems encountered in open loop ground source heat pump (GSHP) systems and aquifer thermal energy storage (ATES) systems. Here we present a surveillance strategy ... -
How to avoid gas clogging in groundwater heat pump systems: a case study from the Lena terrasse system in Melhus, Norway
Stenvik, Lars Aaberg; Gjengedal, Sondre; Ramstad, Randi Kalskin; Frengstad, Bjørn S. (Peer reviewed; Journal article, 2022)Vacuum pressures are unfavorable in water pipes since they pose a risk to degassing dissolved gases from the water and air in-leakage. If the water flow rate through the pipeline is too low, gas bubbles will rise to local ... -
Multi-criteria studies and assessment supporting the selection of locations and technologies used in co2-egs systems
Pajak, Leszek; Sowiżdżał, Anna; Gładysz, Paweł; Tomaszewska, Barbara; Miecznik, Maciej; Andresen, Trond; Frengstad, Bjørn S.; Chmielowska, Anna (Peer reviewed; Journal article, 2021)The paper describes application of the cross-impact method in the process of selecting locations and technologies used in a geothermal system based on energy accumulated in a dry rock formation, where CO2 is used as the ... -
Numerical modeling of a potential CO2-supplied enhanced geothermal system (CO2-EGS) in the Åsgard field, Norway
Miecznik, Maciej; Tyszer, Magdalena; Sowizdzal, Anna; Andresen, Trond; Frengstad, Bjørn S.; Stenvik, Lars Aaberg; Pierzchala, Karol; Gladysz, Pawel (Journal article, 2024)The principle of Enhanced Geothermal System (EGS) technology is that water injected at a sufficiently high pressure will lead to the fracturing of naturally impermeable rocks, and as a result, this will create hydraulic ... -
Online remote-controlled and cost-effective fouling and clogging surveillance of a groundwater heat pump system
Gjengedal, Sondre; Stenvik, Lars Aaberg; Ramstad, Randi Kalskin; Ulfsnes, Jan Ivar; Hilmo, Bernt Olav; Frengstad, Bjørn S. (Peer reviewed; Journal article, 2021)Fouling and clogging of groundwater wells and heat exchangers are among the major operational challenges for groundwater heat pump (GWHP) and aquifer thermal energy storage (ATES) systems. This article presents the application ...