An analytical model for transient heat transfer in ground-coupled heat exchangers of closed-loop geothermal systems

Ghoreishi‐Madiseh, Seyed Ali; Kuyuk, Ali Fahrettin; Brito, Marco Antonio Rodrigues de

doi:10.1016/j.applthermaleng.2019.01.020

Cited by 39 publications

(18 citation statements)

References 16 publications

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“…To attack the climate change, it is significant to develop alternative energy technologies like solar [4], wind [5], biomass [6] and geothermal energy [7,8], which are able to provide energy in more efficient and healthy way. In this context, geothermal heat pump (GHP) system has already turned into a dominant choice for energy supply in commercial and residential buildings owing to its high Coefficient of Performance (COP) [9]. The global GHP capacity is anticipated to increase by about 150% from 2013 to 2020 [10], as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Techno-economic assessment of the horizontal geothermal heat pump systems: A comprehensive review

Cui

Zhu

Twaha

et al. 2019

Energy Conversion and Management

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Geothermal heat pump has been widely recognized as one of the promising technologies for building applications because of its high energy efficiency and low operating expense, however the high capital investment and installation costs discourage building owners to choose such a system. The horizontal geothermal heat pump system with reduced cost is a viable option that would be utilized widely, the aim of this paper is to catalogue and critique a range of effective approaches for the horizontal geothermal heat pump systems in different regions based on techno-economic assessment data. A ground heat exchanger is a vital component of the horizontal geothermal heat pump. The state-of-the-art analytical and numerical models of the linear-loop, slinky-coil and spiral-coil ground heat exchangers are generalized, in addition to their advantages and disadvantages. A large number of economic evaluation methods for analysing the financial performance of the horizontal geothermal heat pump system are presented. At the end, the standpoints, recommendations and potential future study on the horizontal geothermal heat pump system are deliberated.

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Section: Introductionmentioning

confidence: 99%

Techno-economic assessment of the horizontal geothermal heat pump systems: A comprehensive review

Cui

Zhu

Twaha

et al. 2019

Energy Conversion and Management

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“…with (16) To avoid the matrix inversion, R ∆ is found with a faster resolution using an additional matrix [S], and this yields Eq. 17:…”

Section: Nodal Network Methodsmentioning

confidence: 99%

“…Multiple heat source systems also exist in other domains: the geothermal heat exchangers [16,17,18,19,20,21], the winding heads of electric machines [22,23] and other specific systems such as the heated pavement system to de-ice an airfield runway [24,25]. These multiple heat source issues can be solved using numerical methods like the Finite Element Methods.…”

Section: Subjectmentioning

confidence: 99%

A fast compact model to simulate the heat exchanges in a bundle of electric wires

Petitgirard

Baucour

Chamagne

et al. 2020

Thermal Science and Engineering Progress

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The challenges of improving wiring harness designs in automotive, aerospace or transport fields are safety, ecology, weight, and cost. To this end, harnesses require superior thermal management, which involves considering several thermal sources with an uncontrolled layout. To date, the primary methods employed for thermal resolution are based on commercial softwares with meshing capabilities because evaluating temperature evolution influenced by several sources in an uncontrolled wire layout is difficult. This study presents a faster alternative method in which an equation based on the Infinite Line Source (ILS) model is used to create a nodal network. A more efficient matrix mathematical application is adapted to solve faster the ILS model. The ILS model relies on a fully connected node network. The wire bundle is a complex system with a variable environment and an uncontrolled wire layout. This work improves and adapts a fast mathematical model to complex geometries. Thus, the adaptation required by the model involves many assumptions. This new approach was tested on 2-wire and 10-wire layouts and then compared with results obtained by using a commercial software: Ansys Fluent. Some gaps exist between these methods. We propose a corrective model that uses equivalent conductivity to solve that issue.

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“…Most analytical and numerical methods are not always able to actually predict the temperature distribution in the ground [13]. More about the numerical methods and simulations used in the calculations of BHE and heat transfer in the ground can be found in [2,12,[39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58].…”

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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An analytical model for transient heat transfer in ground-coupled heat exchangers of closed-loop geothermal systems

Cited by 39 publications

References 16 publications

Techno-economic assessment of the horizontal geothermal heat pump systems: A comprehensive review

Techno-economic assessment of the horizontal geothermal heat pump systems: A comprehensive review

A fast compact model to simulate the heat exchanges in a bundle of electric wires

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

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