A simplified model of energy pile for ground-source heat pump systems

Lee, C.K.; Lam, H.N.

doi:10.1016/j.energy.2013.03.077

Cited by 50 publications

(16 citation statements)

References 14 publications

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“…[5]) or finite difference analysis (e.g. [6], [7], [8]). Numerical simulation is also commonly used as a research tool, for example to investigation of pipe arrangements and thermal performance (e.g.…”

Section: Model State Of the Artmentioning

confidence: 99%

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A resistive-capacitive model of pile heat exchangers with an application to thermal response tests interpretation

Maragna

Loveridge

2019

Renewable Energy

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• A new finite cylindrical source model with adiabatic surface is developed. • A new resistive-capacitive semi-analytical pile heat exchanger model is developed. • The new model improves the assessment of pile thermal performance. • Neglecting heat capacitance in the pile leads to an underestimation of performance. • The new model is successfully used to interpret a thermal r esponse test.

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Section: Model State Of the Artmentioning

confidence: 99%

“…Regressions over the five coefficients of the HFCS model Gmax X, A1 A2 A3 established for 10 -4 t* 1.2×106 and 10 H* 200.…”

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confidence: 99%

A resistive-capacitive model of pile heat exchangers with an application to thermal response tests interpretation

Maragna

Loveridge

2019

Renewable Energy

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“…In literature, very little information seems to be available about the global thermal performance of energy piles during the whole operational life, whereas many papers deal with the local heat transfer characteristics of these devices [18][19][20]. Instead, several numerical investigations have been carried out on borehole heat exchangers global characteristics, such as in [21].…”

Section: Introductionmentioning

confidence: 98%

Energy and economic savings using geothermal heat pumps in different climates

Morrone¹,

Coppola²,

Raucci³

2014

Energy Conversion and Management

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“…A large number of different software types is being used in these investigations. Finite difference methods (FDM) used by TRNSYS [18,26] and IDA-ICE [27][28][29][30] are widely adopted, due to their ability to account for variable ground surface temperatures [31,32]. In some recent approaches, these can even be combined with probabilistic analysis [33].…”

Section: Introductionmentioning

confidence: 99%

Energy Pile Field Simulation in Large Buildings: Validation of Surface Boundary Assumptions

2019

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As the energy efficiency demands for future buildings become increasingly stringent, preliminary assessments of energy consumption are mandatory. These are possible only through numerical simulations, whose reliability crucially depends on boundary conditions. We therefore investigate their role in numerical estimates for the usage of geothermal energy, performing annual simulations of transient heat transfer for a building employing a geothermal heat pump plant and energy piles. Starting from actual measurements, we solve the heat equations in 2D and 3D using COMSOL Multiphysics and IDA-ICE, discovering a negligible impact of the multiregional ground surface boundary conditions. Moreover, we verify that the thermal mass of the soil medium induces a small vertical temperature gradient on the piles surface. We also find a roughly constant temperature on each horizontal cross-section, with nearly identical average values when either integrated over the full plane or evaluated at one single point. Calculating the yearly heating need for an entire building, we then show that the chosen upper boundary condition affects the energy balance dramatically. Using directly the pipes’ outlet temperature induces a 54% overestimation of the heat flux, while the exact ground surface temperature above the piles reduces the error to 0.03%.

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A simplified model of energy pile for ground-source heat pump systems

Cited by 50 publications

References 14 publications

A resistive-capacitive model of pile heat exchangers with an application to thermal response tests interpretation

A resistive-capacitive model of pile heat exchangers with an application to thermal response tests interpretation

Energy and economic savings using geothermal heat pumps in different climates

Energy Pile Field Simulation in Large Buildings: Validation of Surface Boundary Assumptions

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