Journal ArticleDOI
Fast fluid and ground temperature computation for geothermal ground-loop heat exchanger systems
Denis Marcotte,Philippe Pasquier +1 more
TLDR
In this paper, the hourly temperature computation can be seen as a convolution in the time domain that is most efficiently evaluated by fast Fourier transform (FFT) and an additional substantial reduction in computing time is obtained by subsampling the analytical function at a few selected times according to a geometric sequence and then using a good quality interpolant such as the cubic spline.About:
This article is published in Geothermics.The article was published on 2008-12-01. It has received 145 citations till now. The article focuses on the topics: Fast Fourier transform & Computation.read more
Citations
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Journal ArticleDOI
A moving finite line source model to simulate borehole heat exchangers with groundwater advection
TL;DR: In this article, a new analytical approach for the thermal analysis of ground source heat pumps (GSHPs) that considers axial and groundwater flow effects was developed, and compared with existing analytical solutions based on the finite and infinite line source theory is carried out.
Journal ArticleDOI
An improved thermal response test for U-tube ground heat exchanger based on optical fiber thermometers
TL;DR: In this paper, vertical temperature profiles were obtained using retrievable optical fiber sensors inserted into the U-tubes of two ground heat exchangers (GHEs) installed at Maebaru City (Fukuoka, Kyushu) and Kushiro City (Hokkaido), Japan.
Journal ArticleDOI
Field test and numerical investigation on the heat transfer characteristics and optimal design of the heat exchangers of a deep borehole ground source heat pump system
TL;DR: In this paper, the authors investigated the heat transfer characteristics of the heat exchanger of a deep borehole ground source heat pump (DBGSHP) through both field test and numerical simulation.
Journal ArticleDOI
Energy and geotechnical behaviour of energy piles for different design solutions
Niccolò Batini,Alessandro F. Rotta Loria,Paolo Conti,Daniele Testi,Walter Grassi,Lyesse Laloui +5 more
TL;DR: In this article, numerical sensitivity analyses were performed to investigate the thermo-mechanical response of a full-scale energy pile for different pipe configurations, foundation aspect ratios, mass flow rates of the fluid circulating in the pipes and fluid mixture compositions.
Journal ArticleDOI
A semi-analytical method to generate g-functions for geothermal bore fields
Massimo Cimmino,Michel Bernier +1 more
TL;DR: In this article, a new methodology for the generation of thermal response factors of geothermal bore fields using the concept of g-functions introduced by Eskilson was introduced, where boreholes are divided into segments to consider the variation of the heat extraction rates along the length of the boreholes and the analytical finite line source (FLS) solution is used to calculate the temperature variations at the wall of each borehole segment along the axial direction.
References
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Book
Conduction of Heat in Solids
H. S. Carslaw,John Conrad Jaeger +1 more
TL;DR: In this paper, a classic account describes the known exact solutions of problems of heat flow, with detailed discussion of all the most important boundary value problems, including boundary value maximization.
Journal ArticleDOI
An algorithm for the machine calculation of complex Fourier series
J.W. Cooley,John W. Tukey +1 more
TL;DR: Good generalized these methods and gave elegant algorithms for which one class of applications is the calculation of Fourier series, applicable to certain problems in which one must multiply an N-vector by an N X N matrix which can be factored into m sparse matrices.
The fast Fourier Transform
TL;DR: A computer algorithm that computes the discrete Fourier transform much faster than other algorithms, is explained and examples and detailed procedures are provided to assist the reader in learning how to use the algorithm.
Dissertation
Thermal analysis of heat extraction boreholes
TL;DR: T A B L E O F C O N T E N T S Nomenclature as mentioned in this paper was used in the work of the authors of this paper. But it was not used in this article.
Journal ArticleDOI
A finite line‐source model for boreholes in geothermal heat exchangers
TL;DR: An analytical solution of the transient temperature response in a semi-infinite medium with a line source of finite length has been derived, which is a more appropriate model for boreholes in geothermal heat exchangers, especially for their long-duration operation.