Influences of ground saturation and thermal boundary condition on energy harvesting using geothermal piles

Ghasemi‐Fare, Omid; Basu, Prasenjit

doi:10.1016/j.enbuild.2018.01.030

Cited by 59 publications

(12 citation statements)

References 40 publications

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“…Ghasemi-Fare et al [63] found that saturated ground cannot be completely elaborated by conductive heat transfer and the heat transfer through temperature-induced pore fluid should be taken into account in the evaluation of thermal performances. In wet configurations, heat transfer rate per unit surface area was measured to be higher than a dry one and comparing dry with 20% moist system, maximum rise in daily heat transfer rate was reported in April, May and June (22.7%, 23.7% and 24.1% respectively) [64].…”

Section: Literature Reviewmentioning

confidence: 99%

Techno-economic assessment and optimization of a hybrid renewable earth - air heat exchanger coupled with electric boiler, hydrogen, wind and PV configurations

2020

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Section: Literature Reviewmentioning

confidence: 99%

Techno-economic assessment and optimization of a hybrid renewable earth - air heat exchanger coupled with electric boiler, hydrogen, wind and PV configurations

2020

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“…Thermocouples with similar distances from the pile have experienced similar thermal changes throughout the test, with the slight higher temperature changes for the deeper sensors which can be due to the boundary conditions on the soil surface, allowing heat loss through heat convective flow from the soil surface. The effect of insulated and non-insulated boundary conditions at the ground surface has been discussed in literature [27]. Although the influence zone of 2D is reported for the radial heat transfer surrounding the energy pile, the temperature changes from 2D distance vertically under the pile toe has changed less than 15% of the pile temperature increase.…”

Section: Procedures and Test Programmentioning

confidence: 99%

Investigation of thermo-mechanical response of a geothermal pile through a small-scale physical modelling

et al. 2020

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Energy piles have been used around the world to harvest geothermal energy to heat and cool residential and commercial buildings. In order to design energy geo-structures, thermo-mechanical response of the geothermal pile must be carefully understood. In this paper, a small scale physical model is designed and a series of heating thermal cycles with various vertical mechanical loads are performed. The instrumented pile is installed inside a dry sand bed. Changes in pile head displacement, shaft strains and pile and sand temperatures are monitored using an LVDT, strain gauges and thermocouples, respectively. Prolonged heating cycles, which would continue until boundary temperature changes, would allow the investigation of excessive heat injection when service loads are active on the pile. The thermal response is discussed including confirmation of a temperature influence zone around the pile, the increase in soil temperature, and minimum vertical heat dispersion in the soil. The mechanical response includes plastic settlements when the vertical load passes 20% of ultimate capacity. Plastic settlements have been observed at the half of the capacity reported for the shorter thermal cycles in similar models. The decrease in the capacity indicates a reduction in elastic response of the soil during longer thermal cycles.

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“…One of the most important parameters that affects the performance of GSHP is the soil temperature. It fluctuates due to both the heat transfer from/to the heat exchangers and the natural heat transfer from the surrounding environment [57][58][59][60][61][62].…”

Section: Ground Temperature Datamentioning

confidence: 99%

Ground-Source Heat Pumps with Horizontal Heat Exchangers for Space Cooling in the Hot Tropical Climate of Thailand

et al. 2019

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The cooling of spaces in tropical regions, such as Southeast Asia, consumes a lot of energy. Additionally, rapid population and economic growth are resulting in an increasing demand for space cooling. The ground-source heat pump has been proven a reliable, cost-effective, safe, and environmentally-friendly alternative for cooling and heating spaces in various countries. In tropical countries, the presumption that the ground-source heat pump may not provide better thermal performance than the normal air-source heat pump arises because the difference between ground and atmospheric temperatures is essentially low. This paper reports the potential use of a ground-source heat pump with horizontal heat exchangers in a tropical country—Thailand. Daily operational data of two ground-source heat pumps and an air-source heat pump during a two-month operation are analyzed and compared. Life cycle cost analysis and CO2 emission estimation are adopted to evaluate the economic value of ground-source heat pump investment and potential CO2 reduction through the use of ground-source heat pumps, in comparison with the case for air-source heat pumps. It was found that the ground-source heat pumps consume 17.1% and 18.4% less electricity than the air-source heat pump during this period. Local production of heat pumps and heat exchangers, as well as rapid regional economic growth, can be positive factors for future ground-source heat pump application, not only in Thailand but also southeast Asian countries.

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Influences of ground saturation and thermal boundary condition on energy harvesting using geothermal piles

Cited by 59 publications

References 40 publications

Techno-economic assessment and optimization of a hybrid renewable earth - air heat exchanger coupled with electric boiler, hydrogen, wind and PV configurations

Techno-economic assessment and optimization of a hybrid renewable earth - air heat exchanger coupled with electric boiler, hydrogen, wind and PV configurations

Investigation of thermo-mechanical response of a geothermal pile through a small-scale physical modelling

Ground-Source Heat Pumps with Horizontal Heat Exchangers for Space Cooling in the Hot Tropical Climate of Thailand

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