Sensitivity analysis of efficiency thermal energy storage on selected rock mass and grout parameters using design of experiment method

Wołoszyn, Jerzy; Gołaś, Andrzej

doi:10.1016/j.enconman.2014.03.059

Cited by 30 publications

(11 citation statements)

References 19 publications

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“…Furthermore, the high influence of the thermal conductivity of the rock and grout on storage efficiency is in agreement with the results of the sensitivity analysis presented in ref. [40].…”

Section: Results Of the Further Investigations Using The Htip Modelmentioning

confidence: 99%

In Situ Experiment and Numerical Model Validation of a Borehole Heat Exchanger in Shallow Hard Crystalline Rock

et al. 2018

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Accurate and fast numerical modelling of the borehole heat exchanger (BHE) is required for simulation of long-term thermal energy storage in rocks using boreholes. The goal of this study was to conduct an in situ experiment to validate the proposed numerical modelling approach. In the experiment, hot water was circulated for 21 days through a single U-tube BHE installed in an underground research tunnel located at a shallow depth in crystalline rock. The results of the simulations using the proposed model were validated against the measurements. The numerical model simulated the BHE's behaviour accurately and compared well with two other modelling approaches from the literature. The model is capable of replicating the complex geometrical arrangement of the BHE and is considered to be more appropriate for simulations of BHE systems with complex geometries. The results of the sensitivity analysis of the proposed model have shown that low thermal conductivity, high density, and high heat capacity of rock are essential for maximising the storage efficiency of a borehole thermal energy storage system. Other characteristics of BHEs, such as a high thermal conductivity of the grout, a large radius of the pipe, and a large distance between the pipes, are also preferred for maximising efficiency.

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Section: Results Of the Further Investigations Using The Htip Modelmentioning

confidence: 99%

In Situ Experiment and Numerical Model Validation of a Borehole Heat Exchanger in Shallow Hard Crystalline Rock

et al. 2018

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“…Based on the combination of innovative space-filling criteria and specialized optimization schemes [38,39], the optimized Latin hypercube sampling strategy (OLHS), served as a kind of excellent technique of Design of Experiment (DOE), was employed in the present study. Compared to the conventional Latin hypercube sampling method, OLHS, as a more efficient sampling strategy, requires fewer sample points and achieves a specific level of accuracy [40].…”

Section: Design Of Experiments and Meta-modelingmentioning

confidence: 99%

Optimization of combustion chamber geometry for natural gas engines with diesel micro-pilot-induced ignition

Wang

Liu

et al. 2016

Energy Conversion and Management

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a b s t r a c tSmokeless, low nitrogen oxides (NOx), and high thermal efficiency have been achieved through the lean-burn concept for natural gas engine with diesel micro-pilot-induced ignition (MPII). However, the combustion chamber is usually not specialized for natural gas combustion, and increases in the unburned hydrocarbon (HC) and carbon monoxide (CO) emissions are still a challenge for this type of engines. This paper describes optimization of the combustion chamber geometry to reduce the HC and CO emissions and improve the combustion efficiency in the MPII natural gas engine. The 3-D computational fluid dynamics (CFD) simulation model coupled with a chemical reaction mechanism is described. The temporal development of the short-pulsed diesel spray in a high pressure constant-volume vessel is measured and used to calibrate the spray model in the CFD simulation. The simulation models are validated by the experimental data of the in-cylinder pressure trace, apparent heat release rate (AHRR) and exhaust gas emissions from a single-cylinder MPII natural gas engine. To generate the various combustion chamber geometries, the bowl outline is parameterized by the two cubic Bezier curves while keeping the compression ratio constant. The available design space is explored by the multi-objective non-dominated sorting genetic algorithm II (NSGA-II) with Kriging-based meta-model. With the optimization, the HC and CO emissions are reduced by 56.47% and 33.55%, respectively, while the NOx emissions, the maximum rate of pressure rise and the gross indicated thermal efficiency that are employed as the constraints are slightly improved. Finally, the mechanism of the reduction in HC and CO emissions with the optimized combustion chamber geometry is investigated and discussed in details.

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“…A great number of 3D numerical models have been developed based on the numerical approaches, such as FEM [112,140,147], FVM [148][149][150][151] and FDM [152][153][154]. In terms of the computational requirements, many methods are used to decrease the grids of the BHE elements, including Al-Khoury model [99][100][101], Nabi model [151,152], Mottaghy and Dijkshoorn model [153], Diersch model [154,155], Cui model [156], 3D MTRCM [131] and MDF models [157][158][159]. This section describes a detailed review on 3D heat transfer models for the vertical BHE system.…”

Section: D Heat Transfer Models Of Bhesmentioning

confidence: 99%

A comprehensive review on 2D and 3D models of vertical ground heat exchangers

Cui

Zhu

Twaha

et al. 2018

Renewable and Sustainable Energy Reviews

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The ground source heat pumps (GSHPs) have been extensively applied to commercial and residential buildings owing to their high-energy efficiencies and low running costs. The key component of the GSHP is a ground heat exchanger (GHE). The stateof-the-art two-dimensional (2D) and three-dimensional (3D) heat transfer models for borehole heat exchanger (BHE) and energy pile (EP) systems are reviewed in this paper. The physical procedures of heat transfer and the derivation of energy conservation within different channels of BHE (e.g., U-, W-, helical-shaped or coaxial-shaped) are summarized, in addition to the primary merits and demerits of each model. The main influencing factors on 2D and 3D model solutions including axial heat transfer, friction heat, spacing shack, thermal resistance, thermal short-circuiting between the inlet-pipe and outlet-pipe, are analysed and compared. Furthermore, various applications of these 2D and 3D models are elaborated. Finally, the recommendations, standpoints and potential future research on BHE heat transfer model are highlighted. It is believed that the work presented will contribute to the record of information and experiences necessary to develop BHEs for GSHP systems.

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Sensitivity analysis of efficiency thermal energy storage on selected rock mass and grout parameters using design of experiment method

Cited by 30 publications

References 19 publications

In Situ Experiment and Numerical Model Validation of a Borehole Heat Exchanger in Shallow Hard Crystalline Rock

In Situ Experiment and Numerical Model Validation of a Borehole Heat Exchanger in Shallow Hard Crystalline Rock

Optimization of combustion chamber geometry for natural gas engines with diesel micro-pilot-induced ignition

A comprehensive review on 2D and 3D models of vertical ground heat exchangers

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