Evaluation of temperature profiling quality in determining energy efficiencies of borehole heat exchangers

Śliwa, T.; Sojczyńska, Anna; Rosen, Marc A.; Kowalski, T.

doi:10.1016/j.geothermics.2018.12.005

Cited by 23 publications

(13 citation statements)

References 27 publications

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“…These changes in thermal field are slow in the geothermal zone, so we can consider it to be in a quasistatic state of heat flow. A temperature log through this zone of linear rise of temperatures can be used to estimate the thermal conductivity of the formation with Fourier's Law (Equation ( 2)) [46].…”

Section: Discussionmentioning

confidence: 99%

“…We have presented the attempt to evaluate the effective thermal conductivity of the ground around a certain segment of the length of BHE using the Fourier's Law. This method was mentioned earlier in [46] in their paper and is usually adopted in regional heat flow density estimation [50,51]. Our measurements were based on the assumption that the temperature field is undisturbed in depths larger than 70 m in our particular setting.…”

Section: Discussionmentioning

confidence: 99%

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Inquiry into the Temperature Changes of Rock Massif Used in Energy Production in Relation to Season

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Látal

Grafova

et al. 2021

Sensors

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This research was undertaken to perform and evaluate the temperature measurement in the ground utilized as an energy source with the goal to determine whether significant temperature variations occur in the subsurface during the heating season. The research infrastructure situated on our University campus was used to assess any variations. The observations were made at the so called “Small Research Polygon” that consists of 8 monitoring boreholes (Borehole Heat Exchangers) situated around a borehole used as an energy source. During the heating season, a series of monthly measurements are made in the monitoring boreholes using a distributed temperature system (DTS). Raman back-scattered light is analysed using Optical Frequency Time Domain Reflectometry (OTDR). Our results indicate that no noticeable changes in temperature occur during the heating season. We have observed an influence of long-term variations of the atmospheric conditions up to the depth of a conventional BHE (≈100 m). The resulting uncertainty in related design input parameters (ground thermal conductivity) was evaluated by using a heat production simulation. Production data during one heating season at our research facilities were evaluated against the design of the system. It is possible to construct smaller geothermal installations with appropriate BHE design that will have a minimal impact on the temperature of the surrounding rock mass and the system performance.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Inquiry into the Temperature Changes of Rock Massif Used in Energy Production in Relation to Season

Клемпа

Látal

Grafova

et al. 2021

Sensors

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“…Energy storage can also store energy until it is economic to deploy, and enhance efficiency and energy management (Al-Zareer et al 2020b ). There are various types of energy storage (Koohi-Fayegh and Rosen 2020 ), including thermal energy storage (Dincer and Rosen 2021a ), underground storage using borehole heat exchangers (Sliwa et al 2019 ) and batteries (Al-Zareer et al 2020b ). Energy storage is increasingly being employed in building and HVAC systems (Dincer and Rosen 2015 ), and in renewable energy systems involving hybrid energy schemes (Rekioua 2020 ) and microgrids (Al-Ghussain et al 2020 ).…”

Section: Technologies For Enhancing Energy Sustainabilitymentioning

confidence: 99%

Energy Sustainability with a Focus on Environmental Perspectives

Rosen

2021

Earth Syst Environ

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Energy sustainability is a key consideration for anthropogenic activity and the development of societies, and more broadly, civilization. In this article, energy sustainability is described and examined, as are methods and technologies that can help enhance it. As a key component of sustainability, the significance and importance of energy sustainability becomes clear. Requirements to enhance energy sustainability are described, including low environmental and ecological impacts, sustainable energy resources and complementary energy carriers, high efficiencies, and various other factors. The latter are predominantly non-technical, and include living standards, societal acceptability and equity. The outcomes and results are anticipated to inform and educate about energy sustainability, to provide an impetus to greater energy sustainability.

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“…TRT allows for the determination of the effective thermal conductivity. Thermal conductivity can also be determined by analyzing the undisturbed temperature profile in the borehole [104]. The natural temperature profile can be examined with the NIMO-T probe.…”

Section: Type Of Pipes Materialsmentioning

confidence: 99%

Geothermal Boreholes in Poland—Overview of the Current State of Knowledge

et al. 2021

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Geothermal energy can be useful after extraction from geothermal wells, borehole heat exchangers and/or natural sources. Types of geothermal boreholes are geothermal wells (for geothermal water production and injection) and borehole heat exchangers (for heat exchange with the ground without mass transfer). The purpose of geothermal production wells is to harvest the geothermal water present in the aquifer. They often involve a pumping chamber. Geothermal injection wells are used for injecting back the produced geothermal water into the aquifer, having harvested the energy contained within. The paper presents the parameters of geothermal boreholes in Poland (geothermal wells and borehole heat exchangers). The definitions of geothermal boreholes, geothermal wells and borehole heat exchangers were ordered. The dates of construction, depth, purposes, spatial orientation, materials used in the construction of geothermal boreholes for casing pipes, method of water production and type of closure for the boreholes are presented. Additionally, production boreholes are presented along with their efficiency and the temperature of produced water measured at the head. Borehole heat exchangers of different designs are presented in the paper. Only 19 boreholes were created at the Laboratory of Geoenergetics at the Faculty of Drilling, Oil and Gas, AGH University of Science and Technology in Krakow; however, it is a globally unique collection of borehole heat exchangers, each of which has a different design for identical geological conditions: heat exchanger pipe configuration, seal/filling and shank spacing are variable. Using these boreholes, the operating parameters for different designs are tested. The laboratory system is also used to provide heat and cold for two university buildings. Two coefficients, which separately characterize geothermal boreholes (wells and borehole heat exchangers) are described in the paper.

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Evaluation of temperature profiling quality in determining energy efficiencies of borehole heat exchangers

Cited by 23 publications

References 27 publications

Inquiry into the Temperature Changes of Rock Massif Used in Energy Production in Relation to Season

Inquiry into the Temperature Changes of Rock Massif Used in Energy Production in Relation to Season

Energy Sustainability with a Focus on Environmental Perspectives

Geothermal Boreholes in Poland—Overview of the Current State of Knowledge

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