Heat transfer in the ground with a horizontal heat exchanger installed – Long-term thermal effects

Larwa, Barbara; Kupiec, Krzysztof

doi:10.1016/j.applthermaleng.2019.114539

Cited by 25 publications

(9 citation statements)

References 19 publications

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“…The work [19] presents a one-dimensional mathematical model in which it was assumed that the ground is a semi-infinite body whose physical properties are homogeneous and immutable with temperature. The heat source placed in the ground (corresponding to ground heat exchanger piping) is flat and located at a depth h GHE .…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Despite simplifications, the model seems to be a satisfying approximation when it is used for estimation of a long-term process in a semi-infinite body where the heat source is placed in a plane parallel to the surface, especially if the packing of the exchanger pipes is dense (for instance in a slinky configuration) [19].…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Zhang et al [18] proposed a quasi-three-dimensional heat transfer model for the prediction of ground temperature near the pipes of the heat exchanger. Larwa and Kupiec [19] investigated the long-term influence of a horizontal GHE operation on the ground temperature.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, it was investigated which parameters most strongly affect the value of the minimum ground temperature. The calculations use the ground heat transfer model described in [19].…”

Section: Introductionmentioning

confidence: 99%

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Numerical Analysis of Minimum Ground Temperature for Heat Extraction in Horizontal Ground Heat Exchangers

et al. 2021

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In this work, numerical simulation calculations were performed to investigate the minimum ground temperature that occurs when extracting thermal energy in a horizontal ground heat exchanger system in the Central European climate. The influence of ground thermal conductivity, heat flux extracted from the ground, periodic interruptions in the operation of the heat exchanger, periodic supply of heat energy to the ground, relative humidity of the ambient air, evaporation rate coefficient, and convective heat transfer coefficient on the ground minimum temperature were investigated. Based on the simulation, it was found that the high value of ground thermal conductivity favorably affects the operation of the installation with a ground heat exchanger. Both the reduction of the maximum heat flux taken from the ground, as well as periodic interruptions in the operation of the exchanger effectively protects the ground against excessive cooling. Further, it was found that heat supply to the ground in summer only slightly raises its minimum temperature, as well as the decrease of the relative humidity of the ambient air and evaporation rate coefficient. The change of the convective heat transfer coefficient has no significant impact on the minimum annual ground temperature.

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Section: Mathematical Modelmentioning

confidence: 99%

Section: Mathematical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…In addition, it was investigated which parameters most strongly affect the value of the minimum ground temperature. The calculations use the ground heat transfer model described in [19].…”

Section: Introductionmentioning

confidence: 99%

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Numerical Analysis of Minimum Ground Temperature for Heat Extraction in Horizontal Ground Heat Exchangers

et al. 2021

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“…A ground heat exchanger is an apparatus in which or through which heat is carried from one environment to another [1][2][3][4][5]. It is simply a pipeline or gravel bed placed in the ground through which ventilated air flows.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Yearly Effectiveness of a Diaphragm Ground Heat Exchanger Supported by an Ultraviolet Sterilamp

Rabczak

Kut

2020

Energies

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Ground heat exchangers supplement ventilation systems and provide notable power gains by heating ventilated air during winter and cooling it in summer. Additionally, they prevent recuperator exchangers from freezing. In atmospheric air, there are many types of contaminants and microorganisms that significantly affect the quality of ventilated air. The air that flows through the system of pipes of the heat exchanger may also become contaminated. In order to remove contamination from ventilated air, ultraviolet radiation may be used. This article presents a concept of using a UV-C (ultraviolet with a wavelength of 200–280 nm) lamp in the air duct in front of the air handling unit connected to the ground heat exchanger. The UV-C lamp, apart from clearing the air, may also decrease operational costs thanks to eliminating contamination that forms bacterial jelly on heat exchanger elements.

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Comparison of influence factors on horizontal ground heat exchanger performance through numerical simulation and gray correlation analysis

Shi

et al. 2022

Applied Thermal Engineering

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Heat transfer in the ground with a horizontal heat exchanger installed – Long-term thermal effects

Cited by 25 publications

References 19 publications

Numerical Analysis of Minimum Ground Temperature for Heat Extraction in Horizontal Ground Heat Exchangers

Numerical Analysis of Minimum Ground Temperature for Heat Extraction in Horizontal Ground Heat Exchangers

Analysis of Yearly Effectiveness of a Diaphragm Ground Heat Exchanger Supported by an Ultraviolet Sterilamp

Comparison of influence factors on horizontal ground heat exchanger performance through numerical simulation and gray correlation analysis

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