Estimation and experimental validation of borehole thermal resistance

Go, Gyu-Hyun; Lee, Seung-Rae; Yoon, Seok; Park, Hyunku; Park, SKhan

doi:10.1007/s12205-014-0454-x

Cited by 10 publications

(5 citation statements)

References 6 publications

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“…Comparisons with detailed numerical models have shown that the multipole method yields highly accurate results under all investigated scenarios [36,38,39,[47][48][49]. Young [47] compared borehole thermal resistances calculated with a boundary-fitted coordinates finite volume model and the tenth-order multipole method.…”

Section: Grout Resistancementioning

confidence: 99%

Accuracy of borehole thermal resistance calculation methods for grouted single U-tube ground heat exchangers

Javed

Spitler

2017

Applied Energy

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Section: Grout Resistancementioning

confidence: 99%

Accuracy of borehole thermal resistance calculation methods for grouted single U-tube ground heat exchangers

Javed

Spitler

2017

Applied Energy

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“…The model assumes that each pipe is a line heat source or a multipole to solve the steady state heat transfer problem by superposition to determine the heat flux of each pipe [55]. The multipole model is regarded as an accurate method to calculate the thermal resistance or circular cross section ground heat exchangers when compared with numerical analysis, as shown by Lamarche et al [56], Liao et al [57] and Go et al [58].…”

Section: D Numerical Simulationmentioning

confidence: 99%

Investigation on the thermal response of steel pipe energy piles with different backfill materials

Murari

Tsuha²,

Loveridge³

2022

Renewable Energy

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“…The grout inside the borehole is surrounded by soil as illustrated in Figure 1. Through calculating total thermal borehole resistance with Equation (1) it becomes possible to transform complex u-tube geometry consisting of fluid, pipe and grout into a single grout layer [8,9]:…”

Section: Numerical 2d Finite-volume Modelmentioning

confidence: 99%

“…The main notion behind Equation ( 7) is that it allows the physical domain which consists of concentric layers of grout and soil to be discretized into finite volumes. After control volume discretization is performed, Equations (8)(9)(10)(11)(12)(13)…”

Section: Numerical 2d Finite-volume Modelmentioning

confidence: 99%

“…In order to properly determine borehole thermal resistance, fluid, pipe and grout resistances need to be accounted for. Go et al [8] reviewed various methods of estimating thermal resistance of a borehole where they cited the method proposed by Shonder and Beck [9]. In, Shonder and Beck [9], they multiply the radius of the u-tube pipe by 2 to get the equivalent radius which ensures that the cross-sectional area of the equivalent cylinder is the same as that of two u-tubes.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical heat transfer comparison study of hybrid and non-hybrid ground source heat pump systems

2016

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Ground Source Heat Pump (GSHP) systems, if improperly designed may lead to overheating or overcooling of the ground. Good designs ensure properly balanced energy storage through adequately sizing ground-loops. Hybrid systems combine conventional Heating, Ventilating, and Air Conditioning (HVAC) with GSHPs in order to significantly reduce the high installation costs of GSHPs. The hybrid systems are designed in such a way that GSHPs provide the base building energy demands while the conventional HVAC is used only during the peak hours. In general, all buildings can be divided into two main categories: cooling dominant and heating dominant. If a building is cooling dominant, ground temperature increases with time and in heating dominant cases it decreases. A severe ground temperature increase/decrease is referred to as 'ground fouling' because it can render the GSHP inoperable, as temperature differences are required to maintain controlled heat flow. This paper compares long-term operation of hybrid and nonhybrid GSHP systems in order to investigate the effectiveness of hybridization at alleviating 'ground fouling'. A homespun 2D finite-volume model is proposed to study heat transfer in ground coupled heat pump systems and is verified against an analytical solution as well as experimental data. Through simulation of different building types, it is demonstrated that hybridization has potential to reduce 'ground fouling' but only in limited cases for which a large portion of the energy demands is being met by the conventional HVAC.

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Estimation and experimental validation of borehole thermal resistance

Cited by 10 publications

References 6 publications

Accuracy of borehole thermal resistance calculation methods for grouted single U-tube ground heat exchangers

Accuracy of borehole thermal resistance calculation methods for grouted single U-tube ground heat exchangers

Investigation on the thermal response of steel pipe energy piles with different backfill materials

Numerical heat transfer comparison study of hybrid and non-hybrid ground source heat pump systems

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