G-functions for bore fields with mixed parallel and series connections considering axial fluid temperature variations

Cimmino, Massimo

doi:10.22488/okstate.18.000015

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…Cimmino [39] later developed a "fast" method for calculating g-functions that takes advantage of symmetry with the borefield to simplify and reduce computations. Cimmino later extended this model to compute g-functions for GHE with series-or parallel-connected boreholes [40,41]. The code for this library is published online [42].…”

Section: Response Factor Modelsmentioning

confidence: 99%

An Enhanced Vertical Ground Heat Exchanger Model for Whole-Building Energy Simulation

Mitchell

Spitler

2020

Energies

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This paper presents an enhanced vertical ground heat exchanger (GHE) model for whole-building energy simulation (WBES). WBES programs generally have computational constraints that affect the development and implementation of component simulation sub-models. WBES programs require models that execute quickly and efficiently due to how the programs are utilized by design engineers. WBES programs also require models to be formulated so their performance can be determined from boundary conditions set by upstream components and environmental conditions. The GHE model developed during this work utilizes an existing response factor model and extends its capabilities to accurately and robustly simulate at timesteps that are shorter than the GHE transit time. This was accomplished by developing a simplified dynamic borehole model and then exercising that model to generate exiting fluid temperature response factors. This approach blends numerical and analytical modeling methods. The existing response factor models are then extended to incorporate the exiting fluid temperature response factor to provide a better estimate of the GHE exiting fluid temperature at short simulation timesteps.

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Section: Response Factor Modelsmentioning

confidence: 99%

An Enhanced Vertical Ground Heat Exchanger Model for Whole-Building Energy Simulation

Mitchell

Spitler

2020

Energies

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“…The two regions are joined by a condition of continuity of temperature and heat transfer rate at the borehole walls. The paper expands on earlier work (Cimmino 2018b), and includes expressions to evaluate fluid temperatures and heat extraction rates in boreholes with axially varying borehole wall temperature as well as a sample simulation of a borehole thermal energy storage consisting of 144 boreholes.…”

Section: Introductionmentioning

confidence: 99%

Semi-Analytical Method for g -Function Calculation of bore fields with series- and parallel-connected boreholes

Cimmino

2019

Science and Technology for the Built Environment

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A semi-analytical method for the calculation of g-functions of bore fields with mixed arrangements of series-and parallel-connected boreholes is presented. Borehole wall temperature variations are obtained from the temporal and spatial superposition of the finite line source (FLS) solution. The FLS solution is coupled to a quasi-steady-state solution of the fluid temperature profiles in the boreholes, considering the piping connections between the boreholes. The dimensionless borehole wall temperatures in the bore field and the inlet fluid temperature are obtained from the simultaneous solution of the heat transfer inside and outside the boreholes. The effective borehole wall temperature, i.e. the g-function, is defined based on the dimensionless inlet fluid temperature and a newly introduced effective bore field thermal resistance. The g-function evaluation method is validated against the DST model and its use is demonstrated in a sample simulation of a seasonal thermal energy storage system.

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G-functions for bore fields with mixed parallel and series connections considering axial fluid temperature variations

Abstract: A semi-analytical method based on the finite line source (FLS)

Cited by 2 publications

References 7 publications

An Enhanced Vertical Ground Heat Exchanger Model for Whole-Building Energy Simulation

An Enhanced Vertical Ground Heat Exchanger Model for Whole-Building Energy Simulation

Semi-Analytical Method for g -Function Calculation of bore fields with series- and parallel-connected boreholes

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