Experimental study of several types of ground heat exchanger using a steel pile foundation

Jalaluddin,; Miyara, Akio; Tsubaki, Koutaro; Inoue, S.; Yoshida, Kentaro

doi:10.1016/j.renene.2010.08.011

Cited by 171 publications

(77 citation statements)

References 11 publications

(3 reference statements)

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“…To confirm reliability of numerical simulation models implemented in present study, the heat transfer rate obtained from present simulation results were compared with experimental and numerical results of Jalaluddin et al [17,18]. For comparison with previous results, the assumptions used i.e., (i) hybrid mesh generation method; (ii) CFD code; (iii) similar parameters; (iv) similar boundary conditions and initial conditions; (v) experimental data in site.…”

Section: Model Validationmentioning

confidence: 80%

“…From previous study of Jalaluddin et al [17,18], it is shown that double tube (coaxial) vertical GHE has higher thermal performance than other U-tube and multi-tube vertical GHEs. That's why double tube vertical GHE has considered for optimization.…”

Section: Introductionmentioning

confidence: 96%

“…The three types: U-tube, double-tube, and multi-tube GHEs were experimentally and numerically tested in the cooling mode under the same conditions [17,18]. From previous study of Jalaluddin et al [17,18], it is shown that double tube (coaxial) vertical GHE has higher thermal performance than other U-tube and multi-tube vertical GHEs.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Optimization of Double Tube GHE for Ground Source Heat Pump

Ali¹

2017

IJSGE

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Abstract:In this paper, a two-dimensional axisymmetric numerical simulation model was developed for optimization of double (coaxial) tube vertical ground heat exchangers (GHEs) in cooling mode. Details of the heat transfer rates and pressure drops for each model are presented and analyzed. The results of the numerical study of optimization of double tube vertical GHEs have been done by considering heat transfer rates and pressure drops. The effect of different inlet and outlet tube diameters, and mass flow rates were numerically investigated. Effect of the different materials on heat transfer and longtime operation also discussed. The double tube vertical GHEs are more effective in laminar flow condition considering balance between heat transfer and pressure drop. The results indicate that since in laminar flow condition, pressure drop is not significantly high, it is possible to reduce the inlet and outlet diameter of double tube GHEs if double tube GHEs operate in laminar flow condition. The heat transfer rate decreased only 17% but diameter of the inlet tube can be reduced from 130 mm to 40 mm with fixed outlet diameter 20 mm. Heat transfer rate can also be enhanced by reducing the outlet tube diameter for a fixed inlet tube diameter. Long time operation suggested the possibility of installation of multiple double tube GHE at 2.0 m apart.

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Section: Model Validationmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 96%

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Numerical Optimization of Double Tube GHE for Ground Source Heat Pump

Ali¹

2017

IJSGE

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“…The literature on heat exchangers is voluminous and continues to be active today (e.g., Refs. [5][6][7][8][9][10]). The field covers two main aspects of this class of flow systems: fluid flow and heat transfer performance, and ways (criteria) of evaluating performance [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Counterflow heat exchanger with core and plenums at both ends

Bejan

Alalaimi

Lorente

et al. 2016

International Journal of Heat and Mass Transfer

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a b s t r a c tThis paper illustrates the morphing of flow architecture toward greater performance in a counterflow heat exchanger. The architecture consists of two plenums with a core of counterflow channels between them. Each stream enters one plenum and then flows in a channel that travels the core and crosses the second plenum. The volume of the heat exchanger is fixed while the volume fraction occupied by each plenum is variable. Performance is driven by two objectives, simultaneously: low flow resistance and low thermal resistance. The analytical and numerical results show that the overall flow resistance is the lowest when the core is absent, and each plenum occupies half of the available volume and is oriented in counterflow with the other plenum. In this configuration, the thermal resistance also reaches its lowest value. These conclusions hold for fully developed laminar flow and turbulent flow through the core. The curve for effectiveness vs number of heat transfer units (N tu ) is steeper (when N tu < 1) than the classical curves for counterflow and crossflow.

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“…We investigated experimentally the performance of three types of GHEs, including U-tube, double-tube, and multi-tube GHEs, in cooling mode with continuous operation [15] and discontinuous short time period of operation [16]. In continuous operation, the heat exchange rates are high in the beginning of operation.…”

Section: Introductionmentioning

confidence: 99%