A Multiple Load Aggregation Algorithm for Annual Hourly Simulations of GCHP Systems

Bernier, Michel; Pinel, Patrice; Labib, Richard; Paillot, Raphaël

doi:10.1080/10789669.2004.10391115

Cited by 101 publications

(51 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To make the analytical results obtained by the line source theory for analysis outside of the borehole more accurate and comparable to numerical ones, several studies have focused on improvements [29][30][31][32]. Hellström [18], Kavanaugh [33], Bernier et al [34] and Hikari et al [35] focus on improvements on cylindrical source solution.…”

Section: Heat Transfer Inside the Boreholementioning

confidence: 99%

“…However, for long time periods, this process becomes computationally intensive. Some authors have focused on introducing efficient algorithms that lower the number of time steps [34,39], while others have used the convolution theorem in the frequency domain using fast Fourier transform to lower the computational burden of hourly temperature evaluations related to a time-varying heat load [28].…”

Section: Heat Transfer Inside the Boreholementioning

confidence: 99%

See 1 more Smart Citation

A Review of the Modelling of Thermally Interacting Multiple Boreholes

Koohi-Fayegh

Rosen

2013

Sustainability

View full text Add to dashboard Cite

Much attention is now focused on utilizing ground heat pumps for heating and cooling buildings, as well as water heating, refrigeration and other thermal tasks. Modeling such systems is important for understanding, designing and optimizing their performance and characteristics. Several heat transfer models exist for ground heat exchangers. In this review article, challenges of modelling heat transfer in vertical heat exchangers are described, some analytical and numerical models are reviewed and compared, recent related developments are described and the importance of modelling these systems is discussed from a variety of aspects, such as sustainability of geothermal systems or their potential impacts on the ecosystems nearby.

show abstract

Section: Heat Transfer Inside the Boreholementioning

confidence: 99%

Section: Heat Transfer Inside the Boreholementioning

confidence: 99%

A Review of the Modelling of Thermally Interacting Multiple Boreholes

Koohi-Fayegh

Rosen

2013

Sustainability

View full text Add to dashboard Cite

show abstract

“…Sample results from the model suggest that groundwater flow has a significant effect on ground heat exchanger performance only in highly porous or permeable geological media. Bernier et al (2004) contributed an algorithm that systematically aggregates previous time steps that do not markedly influence the current time step in a simulation, while still permitting more recent time steps to have greater effects. Computational time is conserved, with little, if any, reduction in simulation accuracy.…”

Section: Ground-coupled Heat Pumps and Ground Heat Exchangersmentioning

confidence: 99%

Applicability of Related Data, Algorithms, and Models to the Simulation of Ground-Coupled Residential Hot Water Piping in California

Warner¹,

Lutz²

2006

View full text Add to dashboard Cite

Residential water heating is an important consideration in California's building energy efficiency standard. Explicit treatment of ground-coupled hot water piping is one of several planned improvements to the standard. The properties of water, piping, insulation, backfill materials, concrete slabs, and soil, their interactions, and their variations with temperature and over time are important considerations in the required supporting analysis. Heat transfer algorithms and models devised for generalized, hot water distribution system, ground-source heat pump and ground heat exchanger, nuclear waste repository, buried oil pipeline, and underground electricity transmission cable applications can be adapted to the simulation of under-slab water piping. A numerical model that permits detailed examination of and broad variations in many inputs while employing a technique to conserve computer run time is recommended.

show abstract

“…Many geothermal energy studies have focused on modeling single ground boreholes, usually based on analytical [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] and numerical approaches [22][23][24][25][26][27][28][29][30][31][32]. The models vary in regarding how (1) heat conduction in the soil is solved and (2) heat transfer outside of the boreholes is coupled to the heat transfer inside of the borehole, and (3) the numerical methods are accelerated.…”

Section: Introductionmentioning

confidence: 99%

On Thermally Interacting Multiple Boreholes with Variable Heating Strength: Comparison between Analytical and Numerical Approaches

Koohi-Fayegh

Rosen

2012

Sustainability

View full text Add to dashboard Cite

Abstract:The temperature response in the soil surrounding multiple boreholes is evaluated analytically and numerically. The assumption of constant heat flux along the borehole wall is examined by coupling the problem to the heat transfer problem inside the borehole and presenting a model with variable heat flux along the borehole length. In the analytical approach, a line source of heat with a finite length is used to model the conduction of heat in the soil surrounding the boreholes. In the numerical method, a finite volume method in a three dimensional meshed domain is used. In order to determine the heat flux boundary condition, the analytical quasi-three-dimensional solution to the heat transfer problem of the U-tube configuration inside the borehole is used. This solution takes into account the variation in heating strength along the borehole length due to the temperature variation of the fluid running in the U-tube. Thus, critical depths at which thermal interaction occurs can be determined. Finally, in order to examine the validity of the numerical method, a comparison is made with the results of line source method.

show abstract

A Multiple Load Aggregation Algorithm for Annual Hourly Simulations of GCHP Systems

Cited by 101 publications

References 2 publications

A Review of the Modelling of Thermally Interacting Multiple Boreholes

A Review of the Modelling of Thermally Interacting Multiple Boreholes

Applicability of Related Data, Algorithms, and Models to the Simulation of Ground-Coupled Residential Hot Water Piping in California

On Thermally Interacting Multiple Boreholes with Variable Heating Strength: Comparison between Analytical and Numerical Approaches

Contact Info

Product

Resources

About