An Enhanced Vertical Ground Heat Exchanger Model for Whole-Building Energy Simulation

Mitchell, Matt S.; Spitler, Jeffrey D.

doi:10.3390/en13164058

Cited by 9 publications

(4 citation statements)

References 52 publications

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“…For example, the fluid temperature change is strongly related to pipe length, while total exchanged heat flux can be increased with length only until the temperature difference between fluid and undisturbed ground exists. The spatial temperature distribution or fluid temperature profile gives insight into possible limitations of heat exchange that occur due to exhausted temperature difference [95] or thermal short-circuiting inside GHE [26,33,37,95,105,106]. For EAHE and HGHE systems, fluid temperature profiles are not of great interest unless used for more detailed validation of the models or the investigation of the surrounding soil's influence on the GHE performance [10].…”

Section: Performance Indicators For the Evaluation Of Ghesmentioning

confidence: 99%

Application and Design Aspects of Ground Heat Exchangers

et al. 2021

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With the constant increase in energy demand, using renewable energy has become a priority. Geothermal energy is a widely available, constant source of renewable energy that has shown great potential as an alternative source of energy in achieving global energy sustainability and environment protection. When exploiting geothermal energy, whether is for heating or cooling buildings or generating electricity, a ground heat exchanger (GHE) is the most important component, whose performance can be easily improved by following the latest design aspects. This article focuses on the application of different types of GHEs with attention directed to deep vertical borehole heat exchangers and direct expansion systems, which were not dealt with in detail in recent reviews. The article gives a review of the most recent advances in design aspects of GHE, namely pipe arrangement, materials, and working fluids. The influence of the main design parameters on the performance of horizontal, vertical, and shallow GHEs is discussed together with commonly used performance indicators for the evaluation of GHE. A survey of the available literature shows that thermal performance is mostly a point of interest, while hydraulic and/or economic performance is often not addressed, potentially resulting in non-optimal GHE design.

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Section: Performance Indicators For the Evaluation Of Ghesmentioning

confidence: 99%

Application and Design Aspects of Ground Heat Exchangers

et al. 2021

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“…Sliwa et al [1] developed a methodology for determining the energy efficiency of borehole heat exchangers based on temperature profiling. In the case of vertical heat exchangers, the ground temperature distributions concern considerable depths as a function of the length of the boreholes [2][3][4][5][6][7]. Horizontal ground heat exchangers usually require knowledge of temperature distributions in the ground up to several meters [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

The Study of Soil Temperature Distribution for Very Low-Temperature Geothermal Energy Applications in Selected Locations of Temperate and Subtropical Climate

et al. 2022

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The publication presents the results of research on soil temperature distribution at a depth of 0.25–3 m in three measurement locations. Two boreholes were located in Białystok in the temperate climatic zone and one measuring well was installed in Belmez in the subtropical climatic zone. Measurements were made in homogeneous soil layers in sand (Białystok) and in clay (Białystok and Belmez). Based on the results of the measurements, a simplified model of temperature distributions as a function of depth and the number of days in a year was developed. The presented model can be used as a boundary condition to determine heat losses of district heating pipes located in the ground and to estimate the thermal efficiency of horizontal heat exchangers in very low-temperature geothermal energy applications.

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“…Most analytical and numerical methods are not always able to actually predict the temperature distribution in the ground [13]. More about the numerical methods and simulations used in the calculations of BHE and heat transfer in the ground can be found in [2,12,[39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58].…”

Section: Introductionmentioning

confidence: 99%

Determination of the Selected Wells Operational Power with Borehole Heat Exchangers Operating in Real Conditions, Based on Experimental Tests

Piotrowska-Woroniak

2021

Energies

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On the basis of experimental studies, the operational power of four borehole heat exchangers (BHE) under real conditions was determined. The research was carried out in 2018–2019. The theoretical power of the BHE was verified with its operating power. The amount of thermal energy absorbed from the ground by individual BHEs, the operating temperatures obtained at the inlet and outlet of the exchanger, the annual brine flow rate, and the average operating power of the tested wells in two heating seasons were compared and analyzed. Both in 2018 and 2019, none of the examined exchangers achieved an average unit capacity of a well. The aim of the work is to verify the specific ground thermal efficiency indicators adopted for the design of the lower heat source, determined using the computational method and the TRT test with data obtained on the basis of experimental tests. The differences between the results of the tests of the operating parameters of the analyzed BHEs were shown. The data obtained in real conditions is valuable in the research and development of the BHE system.

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An Enhanced Vertical Ground Heat Exchanger Model for Whole-Building Energy Simulation

Cited by 9 publications

References 52 publications

Application and Design Aspects of Ground Heat Exchangers

Application and Design Aspects of Ground Heat Exchangers

The Study of Soil Temperature Distribution for Very Low-Temperature Geothermal Energy Applications in Selected Locations of Temperate and Subtropical Climate

Determination of the Selected Wells Operational Power with Borehole Heat Exchangers Operating in Real Conditions, Based on Experimental Tests

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