A review on the performance of geothermal energy pile foundation, its design process and applications

Sani, Abubakar Kawuwa; Singh, Rao Martand; Amis, Tony; Cavarretta, I.

doi:10.1016/j.rser.2019.02.008

Cited by 159 publications

(59 citation statements)

References 82 publications

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“…In total, the numerical simulations of the thermal cycles were carried out for a duration of 10 years for each soil type and degree of saturation condition. Two cases were investigated during the numerical simulations: (1) where all the GEPs in the group were heated and cooled collectively, and (2) where alternate GEPs were heated.…”

Section: Numerical Simulationmentioning

confidence: 99%

“…Within the pipes, a heat carrier fluid (HCF) is circulated to exchange heat energy with the shallow earth surface. The combined system is often referred to as a ground source heat pump (GSHP) or geothermal energy piles (GEP) system [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…Hence, this paper investigates, via the use of finite element modelling (FEM), the longterm thermo-hydraulic (TH) behaviour of a group of GEPs under cyclic heat injection and extraction process. Two scenarios are studied, namely: (1) the whole piles in the group are thermally activated; (2) where alternate piles are thermally activated in the group in order to reduce the applied thermal load by half. This is especially important where excessive temperature development is anticipated during the operation of the system.…”

Section: Introductionmentioning

confidence: 99%

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Long-Term Thermal Performance of Group of Energy Piles in Unsaturated Soils under Cyclic Thermal Loading

Sani

Singh

2021

Energies

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Geothermal energy piles (GEPs) are an environmentally friendly heat exchange technology that dualizes the role of the structural foundation pile for load support and in meeting the building heating/cooling need. Energy loops made from high-density polyethylene, which allow heat carrier fluid circulation, are fitted into the pile foundation elements to extract or inject and store heat energy in the soil surrounding the pile. This paper reports the results of a numerical study investigating the long-term behaviour of a group of energy piles embedded in unsaturated soils (sand and clay) under continuous cyclic heating and cooling load. Additionally, two scenarios were investigated where: (1) the whole GEPs were heated and cooled collectively; (2) alternate piles were heated and cooled. It was found that the trend of temperature magnitude at all the observed locations decreases with time as a result of the continuous heating and cooling cycles. Furthermore, subjecting alternate GEPs to the heating and cooling cycles result in lower temperature development in comparison to thermally activating all the GEPs in the group. This is attributed to the applied thermal load, which is 0.5 times that considered in the first case. However, this might not be the case where equal thermal load is applied on the GEPs in the two cases investigated.

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Section: Numerical Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Long-Term Thermal Performance of Group of Energy Piles in Unsaturated Soils under Cyclic Thermal Loading

Sani

Singh

2021

Energies

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“…The detailed parameters for the measurement equipment are shown in Table 5. ORC is shown by the green line, which includes evaporation (5-1), expansion (1-2), condensation (2)(3)(4), and a pressure increase process (4)(5). According to uncertainty analysis theory, the uncertainties on the parameters are given by the basic equation 37 The uncertainties are shown in Table 6.…”

Section: Measurement Equipment and Uncertainty Of The Experimental mentioning

confidence: 99%

“…RCC includes four thermodynamic processes, which are shown by the black line: compression process (a,b), condensation process (b-e), throttling process (e,f), and evaporation process (f-a). ORC is shown by the green line, which includes evaporation (5-1), expansion (1-2), condensation (2)(3)(4), and a pressure increase process (4)(5). The red and blue lines express the variation in the heat source and cold source in the two cycles, respectively.…”

Section: Measurement Equipment and Uncertainty Of The Experimental mentioning

confidence: 99%

Performance investigation of the heat pump and power generation integration system

Zhang

Deng

2019

Int J Energy Res

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Summary A novel heat pump and power generation integration system (HPPGIS) using solar energy as a low temperature heat source was presented in this study. This system could be operated in both an organic Rankine cycle power generation (ORC‐PG) mode and a reverse Carnot cycle heat pump (RCC‐HP) mode. Compared with a single heat pump and power generation system, this system improved the utilization efficiency of solar energy, thus showing potential for the generation of economic benefits. Contrastive analyses of different working fluids using ORC‐PG and RCC‐HP systems were conducted first, leading to the selection of R142b and R245fa as optimal fluids. Then, an experimental investigation of the system was carried out under different conditions. A heat pump and ORC system model was proposed and validated by comparing experimental and simulated values. The experimental results indicated that the HPPGIS had good feasibility and stability in both modes. In the ORC‐PG mode, HPPGIS had a power output of 1.29 kW and a thermal efficiency of 4.71% when the water inlet temperature of the evaporator was 90.03°C. In the RCC‐HP mode, HPPGIS had a COP of 3.16 and a heat capacity of 33.24 kW when the water outlet temperature of the condenser was 106.23°C.

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A novel coupled thermo‐mechanical solution for layered isotropic media under various time‐dependent loadings

Zhao

2023

Num Anal Meth Geomechanics

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This study proposes a novel coupled thermo‐mechanical solution for the response of layered isotropic media subjected to time‐varying loads by applying the transformed differential quadrature method (TDQM). Different from the methods of dealing with time partial derivatives with the Laplace transform, this solution discretizes the temporal domain according to the differential quadrature rule, resulting in a more convergent solution under various time‐varying loads. Then, the governing equations are transformed into the Hankel transformed domain that can be solved by the proposed TDQM. Examples are examined to verify the proposed solution and to discuss the convergence of the method. Meanwhile, the coupled thermo‐mechanical responses of the media subjected to time‐harmonic loads are obtained by the TDQM and the method using the Laplace transform, respectively. Comparisons are made to show the better convergence and efficiency of the TDQM. Furthermore, key parameters including the linear expansion coefficients, the thermal diffusivity and the stratification are investigated. Compared with the traditional differential quadrature method (DQM), the TDQM introduces the integral transform theorem to simplify the derivation process and reduce the number of algebraic equations. Consequently, it avoids the difficulty of large‐scale matrix inversion when solving multi‐dimensional problems, and divides the solution process into small‐scale matrix inversion and numerical transform inversion, which has advantages in solution accuracy and efficiency.

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A review on the performance of geothermal energy pile foundation, its design process and applications

Cited by 159 publications

References 82 publications

Long-Term Thermal Performance of Group of Energy Piles in Unsaturated Soils under Cyclic Thermal Loading

Long-Term Thermal Performance of Group of Energy Piles in Unsaturated Soils under Cyclic Thermal Loading

Performance investigation of the heat pump and power generation integration system

A novel coupled thermo‐mechanical solution for layered isotropic media under various time‐dependent loadings

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