Validation of vertical ground heat exchanger design methodologies

Cullin, James R.; Spitler, Jeffrey D.; Montagud, C.; Ruiz-Calvo, Félix; Rees, Simon; Naicker, Selvaraj; Konečný, Petr; Southard, Laura

doi:10.1080/10789669.2014.974478

Cited by 51 publications

(31 citation statements)

References 10 publications

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“…The SBM-based design tool GLHEPro and the ASHRAE handbook method have been validated using operational data from four different installations in the USA and Europe [57]. Actual on-site parameters, real thermal loads, and temperature constraints obtained from the experimental measurements taken over several years were used for the validation.…”

Section: Validation Of Borehole Design Tools and Approachesmentioning

confidence: 99%

Analysis and design methods for energy geostructures

Bourne–Webb

Burlon²,

Javed

et al. 2016

Renewable and Sustainable Energy Reviews

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Section: Validation Of Borehole Design Tools and Approachesmentioning

confidence: 99%

Analysis and design methods for energy geostructures

Bourne–Webb

Burlon²,

Javed

et al. 2016

Renewable and Sustainable Energy Reviews

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“…When the monthly load approach is applied to the BHE field design problem an additional peak load is usually included in the superposition scheme as discussed in recent studies by the Oklahoma State University research group (e.g. Cullin and Spitler, 2015).…”

Section: The Procedures For Comparing the Design Results In Terms Of Dmentioning

confidence: 99%

Investigation on the Effects of Different Time Resolutions in the Design and Simulation of Bhe Fields

Fossa¹,

Rolando²,

Priarone³

2017

Proceedings of the IGSHPA Technical/Research Conference and Expo 2017

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The correct design of a field of Borehole Heat Exchangers (BHE) requires the knowledge of ground thermal properties, heat pump performance and building heating and cooling demand. The sequence of heat pulses from (to) the ground by the heat pump can be described according to different time steps, from hours to months and even years. The monthly time step approach is often the preferred design choice which involves recursive calculations (temporal superposition techniques) and the availability of precalculated temperature response factors (or g-functions) for given BHE field geometries. Such a complex computing task is usually performed thanks to commercial codes in order to fulfil a carrier fluid temperature at the end of a given time horizon, typically 10 or 25 years. In this paper the monthly design approach (EED code and TecGeo proprietary code) is compared with the three thermal pulse approach (modified ASHRAE Method Tp8) and it is demonstrated that for a representative series of case studies the three pulse calculation, easy to be performed at engineering level, is able to provide the correct BHE field overall length with 8% accuracy with respect to the reference monthly calculations.

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“…However, due to the slow transitory nature of heat transfer phenomena in long boreholes, long-term experimental and monitoring studies have been scarce. This has been emphasized in the literature (Cimmino & Bernier, 2015;Cullin et al, 2015;Montagud et al, 2011;Spitler & Bernier, 2011, 2016. Spitler & Bernier (2016) identified the relevance and usefulness of long-term monitoring of thermally unbalanced borehole fields.…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

“…Some installations have been monitored over longer periods of 1 to 5 years (Cullin et al, 2015;Montagud, Corberán, Montero, & Urchueguía, 2011;Yavuzturk & Spitler, 2001) although none of the studies has been used to validate ground heat transfer models. In fact, validation of ground heat transfer models in real systems is harden by the long time scale involved.…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

Design of a laboratory borehole storage model

Mazzotti¹,

Jiang²,

Monzó³

et al. 2018

Proceedings of the IGSHPA Research Track 2018

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This paper presents the design process of a 4x4 Laboratory Borehole Storage (LABS) model through analytical and numerical analyses. This LABS is intended to generate reference Thermal Response Functions (TRFs) as well as to be a validation tool for borehole heat transfer models. The objective of this design process is to determine suitable geometrical and physical parameters for the LABS. An analytical scaling analysis is first performed and important scaling constraints are derived. In particular, it is shown that the downscaling process leads to significantly higher values for Neumann and convective boundary conditions whereas the Fourier number is invariant. A numerical model is then used to verify the scaling laws, determine the size of the LABS, as well as to evaluate the influence of top surface convection and borehole radius on generated TRFs. An adequate shape for the LABS is found to be a quarter cylinder of radius and height 1.0 m, weighing around 1.2 tonnes. Natural convection on the top boundary proves to have a significant effect on the generated TRF with deviations of at least 15%. This convection effect is proposed as an explanation for the difference observed between experimental and analytical results in Cimmino and Bernier (2015). A numerical reproduction of their test leads to a relative difference of 1.1% at the last reported time. As small borehole radii are challenging to reproduce in a LABS, the effect of the borehole radius on TRFs is investigated. It is found that Eskilson's radius correction (1987) is not fully satisfactory and a new correction method must be undertaken.

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Validation of vertical ground heat exchanger design methodologies

Cited by 51 publications

References 10 publications

Analysis and design methods for energy geostructures

Analysis and design methods for energy geostructures

Investigation on the Effects of Different Time Resolutions in the Design and Simulation of Bhe Fields

Design of a laboratory borehole storage model

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