An efficient hybrid model for thermal analysis of deep borehole heat exchangers

Zhao, Yazhou; Pang, Zhonghe; Huang, Yonghui; Ma, Zhibo

doi:10.1186/s40517-020-00170-z

Cited by 18 publications

(13 citation statements)

References 44 publications

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“…during the summer months (Piotrowska-Woroniak, 2021; Walch et al, 2021). However, from a thermal resource perspective the recharge must match the extraction to prevent heat mining and the eventual diminishing of the resource (Casasso and Sethi, 2019;Zhao et al, 2020). To test the impact of intermittency on our results, the reference model with geobattery recharge was modelled with sinusoidal heat extraction for 8 months and no extraction (geobattery It is important to note the model presented here is generic in order to demonstrate the geobattery concept and that there are several further assumptions made that have an impact on the results and conclusions regarding real world sustainability.…”

Section: Discussionmentioning

confidence: 99%

The Geobattery Concept: A Geothermal Circular Heat Network for the Sustainable Development of Near Surface Low Enthalpy Geothermal Energy to Decarbonise Heating

Fraser-Harris¹,

McDermott²,

Receveur³

et al. 2022

Earth Sci. Syst. Soc.

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Decarbonisation of heating represents a major challenge in efforts to reach Net Zero carbon emissions, especially for countries that rely heavily on the combustion of carbon-based fossil fuels to meet heating demand such as the United Kingdom. In this paper we explore the use of near surface low enthalpy geothermal energy accessed via commercial and domestic heat pump technology. These resources may become increasingly important in decarbonisation efforts but, while they are renewable, their sustainability is contingent on appropriate management. Here, we introduce a new geothermal circular heat network concept, known as a “geobattery,” which redistributes recyclable heat from emitters to users via elevated permeability pathways in the subsurface and offers a platform to manage shallow geothermal resources. If successfully implemented the concept has the potential to provide low carbon, resilient, low-cost heating that is sustainable both in terms of heat pump performance and the shallow geothermal resource. We demonstrate the concept based on the cooling requirements of a case study data centre with existing high energy use and the potential to inject the generated heat into elevated permeability pathways in the shallow subsurface. We show that thermal recharge under these conditions has the potential to arrest subsurface temperature declines associated with closely spaced borehole heat exchangers, ensure the long-term sustainability of shallow geothermal resources for generations to come, and play an important role in the decarbonisation of heating.

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Section: Discussionmentioning

confidence: 99%

The Geobattery Concept: A Geothermal Circular Heat Network for the Sustainable Development of Near Surface Low Enthalpy Geothermal Energy to Decarbonise Heating

Fraser-Harris¹,

McDermott²,

Receveur³

et al. 2022

Earth Sci. Syst. Soc.

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“…Clean and renewable energy resources are receiving increasing attention because of their advantages over fossil fuels, which have a significant impact on global warming and pollution. As one of the main options for replacing conventional energy sources, geothermal energy is becoming more and more attractive due to its wide availability, low operating costs and low CO 2 emissions [4]. The design phase of ground source heat pump systems is extremely important as many of the decisions made at this stage can affect the energy performance of the system as well as installation and operating costs [5].…”

Section: Introductionmentioning

confidence: 99%

Determination of the Selected Wells Operational Power with Borehole Heat Exchangers Operating in Real Conditions, Based on Experimental Tests

Piotrowska-Woroniak

2021

Energies

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On the basis of experimental studies, the operational power of four borehole heat exchangers (BHE) under real conditions was determined. The research was carried out in 2018–2019. The theoretical power of the BHE was verified with its operating power. The amount of thermal energy absorbed from the ground by individual BHEs, the operating temperatures obtained at the inlet and outlet of the exchanger, the annual brine flow rate, and the average operating power of the tested wells in two heating seasons were compared and analyzed. Both in 2018 and 2019, none of the examined exchangers achieved an average unit capacity of a well. The aim of the work is to verify the specific ground thermal efficiency indicators adopted for the design of the lower heat source, determined using the computational method and the TRT test with data obtained on the basis of experimental tests. The differences between the results of the tests of the operating parameters of the analyzed BHEs were shown. The data obtained in real conditions is valuable in the research and development of the BHE system.

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“…Clean and renewable energy resources are gaining popularity due to their advantages over fossil fuels, which have a significant impact on global warming and pollution. As one of the main options for replacing conventional energy sources, geothermal energy is becoming more and more attractive due to its wide availability, low operating costs, and low CO 2 emissions [5].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Ground Regeneration around Borehole Heat Exchangers between Heating Seasons in Cold Climates: A Case Study in Bialystok (NE, Poland)

Piotrowska-Woroniak

2021

Energies

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Based on the experimental studies, the process of ground regeneration around the borehole loaded with brine-water heat pumps working exclusively for heating purposes in the period of four consecutive heating seasons in a cold climate was presented. The research was conducted in north-eastern Poland. The aim of the work is to verify the phenomenon of thermal ground regeneration in the period between heating seasons on the basis of the recorded data and to check whether the ground is able to regenerate itself and at what rate. It was noticed that the ground does not fully regenerate, especially during heating seasons with lower temperatures. In the analyzed period, from 22 September 2016 to 12 October 2020, the ground probably cooled irreversibly by 1.5 °C. In order to illustrate and evaluate the speed of changes in the ground, the one’s profile with an undisturbed temperature field was presented for each month of the year. The presented results can be a very important source of information for the analysis of geothermal conditions occurring in the ground. They can be used to verify mathematical models and conduct long-term simulations that allow us to see the complexity of the processes taking place in the ground.

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An efficient hybrid model for thermal analysis of deep borehole heat exchangers

Cited by 18 publications

References 44 publications

The Geobattery Concept: A Geothermal Circular Heat Network for the Sustainable Development of Near Surface Low Enthalpy Geothermal Energy to Decarbonise Heating

The Geobattery Concept: A Geothermal Circular Heat Network for the Sustainable Development of Near Surface Low Enthalpy Geothermal Energy to Decarbonise Heating

Determination of the Selected Wells Operational Power with Borehole Heat Exchangers Operating in Real Conditions, Based on Experimental Tests

Assessment of Ground Regeneration around Borehole Heat Exchangers between Heating Seasons in Cold Climates: A Case Study in Bialystok (NE, Poland)

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