A numerical implementation of the Dynamic Thermal Network method for long time series simulation of conduction in multi-dimensional non-homogeneous solids

Rees, Simon; Fan, Denis

doi:10.1016/j.ijheatmasstransfer.2013.02.016

Cited by 15 publications

(6 citation statements)

References 27 publications

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“…Appropriate method and calculation tools for assessment of heat loss to the ground come into prominence in energy saving and proecological building design according to sustainable development paradigm. Therefore updating and developing calculation methods of heat exchange between the building and the ground [3,4,5,11] remains a very important and contemporary problem.…”

Section: Discussionmentioning

confidence: 99%

Comparison of the Calculations Results of Heat Exchange Between a Single-Family Building and the Ground Obtained with the Quasi-Stationary and 3-D Transient Models. Part 2: Intermittent and Reduced Heating Mode

Staszczuk

2017

Civil and Environmental Engineering Reports

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Section: Discussionmentioning

confidence: 99%

Comparison of the Calculations Results of Heat Exchange Between a Single-Family Building and the Ground Obtained with the Quasi-Stationary and 3-D Transient Models. Part 2: Intermittent and Reduced Heating Mode

Staszczuk

2017

Civil and Environmental Engineering Reports

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“…Having generated three sets of response data in the form of heat flux time series (as in the example shown in Figure 4), discrete weighting factors were calculated for the chosen time step size using Equation (9). The details of this process and how the weighting factors were reduced to a compact data set are described by Wentzel [35] and Rees and Fan [30]. An illustration of the weighting factor series for the admittive flux of a diaphragm wall is shown in Figure 6.…”

Section: Derivation Of Discrete Weighting Factorsmentioning

confidence: 99%

“…This allows for multiple boundary condition surfaces, arbitrary geometries, and heterogeneous thermal properties. The basis of the method is summarised in the following section of the paper; further details are available in reports of earlier work [30,31]. In order to validate the model, experimental heat transfer data was collected from two full-scale DWHE installations in a range of conditions representative of realistic operation.…”

Section: Introductionmentioning

confidence: 99%

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A Model of a Diaphragm Wall Ground Heat Exchanger

et al. 2020

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Ground thermal energy is a sustainable source that can substantially reduce our dependency on conventional fuels for heating and cooling of buildings. To exploit this source, foundation sub-structures with embedded heat exchanger pipes are employed. Diaphragm wall heat exchangers are one such form of ground heat exchangers, where part of the wall is exposed to the basement area of the building on one side, while the other side and the further depth of the wall face the surrounding ground. To assess the thermal performance of diaphragm wall heat exchangers, a model that takes the wall geometry and boundary conditions at the pipe, basement, and ground surfaces into account is required. This paper describes the development of such a model using a weighting factor approach, known as Dynamic Thermal Networks (DTN), that allows representation of the three-dimensional geometry, required boundary conditions, and heterogeneous material properties. The model is validated using data from an extended series of thermal response test measurements at two full-scale diaphragm wall heat exchanger installations in Barcelona, Spain. Validation studies are presented in terms of comparisons between the predicted and measured fluid temperatures and heat transfer rates. The model was found to predict the dynamics of thermal response over a range of operating conditions with good accuracy and using very modest computational resources.

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“…This network includes a combination of admittive and transmittive heat paths and time-varying conductances that are characterized by a series of response factors ( Figure 3-a). The method can be shown to be exact in both continuous and discrete forms and can be applied, in principle, to arbitrary geometries with heterogeneous thermal properties (Claesson, 2002;Rees and Fan, 2013;Wentzel, 2005). This makes the method very attractive for energy pile and DWHE problems.…”

Section: Heat Transfer Modelmentioning

confidence: 99%

Foundation wall heat exchanger model and validation study

Shafagh¹,

Rees²

2018

Proceedings of the IGSHPA Research Track 2018

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Making use of foundation substructural elements as ground heat exchangers is an attractive option for larger non-residential buildings. An alternative to Energy Piles is to use wall substructures-so called diaphragm or screen walls-with embedded pipes that are partly below ground and partly exposed to basement spaces. This paper will describe the development of a model of such a heat exchanger that uses a weighting factor approach known as Dynamic Thermal Networks (DTN). This approach allows for detailed representation of the wall section geometry and multiple boundary conditions. In this case thermal boundary conditions are applied at surfaces representing the adjacent ground and the semiexposed basement wall surface in addition to the pipe surface. The weighting factors for the model have been derived using a parametric numerical model that has been developed using the OpenFOAM library. Validation of the model has been carried out using data from an extended series of thermal response test (TRT) measurements at a full-scale diaphragm wall heat exchanger in Barcelona. In this paper, development of the model using the DTN approach will be briefly described along with the parametric numerical modelling approach used to derive the weighting factor data. Validation test procedures will be presented along with comparisons between the predicted and measured fluid temperatures and heat transfer rates. Given some uncertainty in the experimental thermal properties, the model was able to predict the dynamics of thermal response over a range of operating conditions with reasonable accuracy and using very modest computational resources.

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A numerical implementation of the Dynamic Thermal Network method for long time series simulation of conduction in multi-dimensional non-homogeneous solids

Cited by 15 publications

References 27 publications

Comparison of the Calculations Results of Heat Exchange Between a Single-Family Building and the Ground Obtained with the Quasi-Stationary and 3-D Transient Models. Part 2: Intermittent and Reduced Heating Mode

Comparison of the Calculations Results of Heat Exchange Between a Single-Family Building and the Ground Obtained with the Quasi-Stationary and 3-D Transient Models. Part 2: Intermittent and Reduced Heating Mode

A Model of a Diaphragm Wall Ground Heat Exchanger

Foundation wall heat exchanger model and validation study

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