Underground energy storage utilizing concrete building foundation: Experimental and numerical approach

Mousa, Magdy M.; Bayomy, Ayman M.; Wang, Julie; Dworkin, Seth B.; Saghir, M. Ziad

doi:10.1002/er.5789

Cited by 5 publications

(3 citation statements)

References 24 publications

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“…It is generally applicable to the following conditions: deep foundation pit projects with a depth of more than 10 meters; the envelope is also a part of the main structure and has strict requirements on waterproofing and impermeability; the reverse method is used for construction; and the ground and underground are synchronized. During construction, a diaphragm wall is generally used as the envelope wall; the space in the foundation pit is limited, the distance between the basement exterior wall and the red line is very close; and other enclosure forms cannot meet the operation requirements of the construction; in the ultradeep foundation pit, for example, 30 m–50 m deep foundation pit project, when other enclosures cannot satisfy the requirements, the diaphragm wall is often used as the envelope [ 23 ].…”

Section: Research Theory and Methodsmentioning

confidence: 99%

Deformation Analysis and Research of Building Envelope by Deep Learning Technology under the Reinforcement of the Diaphragm Wall

Wang

Zhao

2022

Computational Intelligence and Neuroscience

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The safety analysis of underground buildings is the most crucial problem in the construction industry. This work aims to optimize the safety analysis results of the underground building envelope and comprehensively improve the safety of the underground building. Long short-term memory (LSTM) can make long-term and short-term predictions, thus reducing the model’s prediction error. Applying it to the deformation analysis, data prediction of the underground building envelope can improve the accuracy of the deformation prediction of the envelope. This work deeply discusses deep learning technology and the principle of the LSTM model. Based on the safety analysis concept of the underground building envelope, LSTM underground building envelope deformation’s prediction model is established and comprehensively evaluated. The results show that in the prediction of horizontal displacement of foundation pit pile of diaphragm wall, the mean relative error (MRE) of the prediction results of the designed model range in 10%–18%, and the calculation time ranges 15–36 s. In the settlement displacement prediction, the model’s MRE is within the range of 5%–7%, and the calculation time is within the range of 17–40 s. With the increase of training times, the prediction accuracy of the model increases, and the calculation time becomes relatively stable. Compared with other models, the relative error of prediction results is about 5.4% at the highest and 1.8% at the lowest. This work provides technical support for improving the safety prediction accuracy of the underground building envelope and provides some reference value for the comprehensive development of the underground building industry.

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Section: Research Theory and Methodsmentioning

confidence: 99%

Deformation Analysis and Research of Building Envelope by Deep Learning Technology under the Reinforcement of the Diaphragm Wall

Wang

Zhao

2022

Computational Intelligence and Neuroscience

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“…The experimental setup and description are thoroughly covered in Mousa et al [116], [117], a rebar cage with a diameter of 9 cm was fastened in the mold base and its circular shape was maintained using a copper ring, as shown in Figure 3. The average underground temperature in Ontario, Canada was reported to be 8-10℃ [94].…”

Section: Methodsmentioning

confidence: 99%

Underground Energy Storage Utilizing Building Concrete Foundation with PCMs: Experimental and Numerical Approach

Mousa

2024

Preprint

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<p>Geothermal energy utilization has increased 90 times since 1995 [1], ground source heat pump (GSHP) has the largest share of this value in a way to reduce the burning of fossil fuels and contributing to the reduction of greenhouse gases (GHG) emissions. Space requirement and the high initial cost of borehole field hinder the widespread of GSHP. Building foundation piles as a GHE has been presented to eliminate these limitations. However, the foundation piles have a lower depth and small spacing compared to the borehole. To increase the storage capacity and to decrease the thermal radius of energy piles, phase change material (PCM) has been presented as a potential solution. In the current study, laboratory-scale energy piles were built with and without PCM, along with a 3-D finite element model. The numerical predictions were validated with the experimental measurements, allowing the investigations of more parameters numerically. The experimental and numerical results showed that PCM increased the storage capacity and decreased the temperature distribution of the lab-scaled pile. The validated model was then modified to study the effect of latent heat and melting temperature numerically. Increasing PCM latent heat increased the models’ storage capacity and decreased their temperature distribution. The validated numerical model was then scaled up to simulate an actual energy pile with a depth of 25 m and a diameter of 1.5 m. The pile’s performance was investigated with an actual building load for a complete year. While the actual heat pump performance curve was integrated into the numerical model. PCM enhanced the heat pump coefficient of performance (COP) by up to 5.2% during the melting of PCM, while its low thermal conductivity decreased the COP by up to 1.8% during the complete solid state. PCM cylinders’ location was also investigated at 6 different locations. In addition, two PCM melting temperature ranges were investigated in order to determine the effect of PCM melting range, the results showed that PCM with a melting temperature range of (4-6)°C is better than a melting range of (1-3)°C for the current study load. Finally, two different PCMs were used inside the same energy pile along the symmetry lines, which showed an average enhancement of 9%.</p>

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“…Thus, efficient energy usage has become necessary. One of the keys to reducing the cost and energy consumption of buildings is to integrate energy efficient designs 5 and to develop new materials for construction. 6 The integration of phase change materials (PCMs) into a building can be used for thermal energy storage (TES) and reduce This paper is an extended and revised article presented at the International Conference on Sustainable Energy and Green Technology 2019 (SEGT 2019) on 11-14 December 2019 in Bangkok, Thailand.…”

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confidence: 99%

Improvement of thermal performance of mortars by using heat storage aggregate made with industrial by‐product to reduce cooling load

Nochaiya

Sangnak

Thongtha

et al. 2021

Intl J of Energy Research

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The usage of waste materials as building materials can be an important method to reduce energy consumption and decrease natural resource usage in the construction industry. In this work, phase change materials (PCMs) were incorporated with industrial by-product materials as an aggregate to produce mortars, which can improve the energy efficiency and improve the environment of buildings. Bottom ash (BA), a by-product from coal-fired power plants, was directly impregnated into paraffin, a PCM, to produce a heat storage aggregate (HSA). The raw materials of the HSA production were characterized by X-ray diffraction, scanning electron microscope, and differential scanning calorimeter. The mortar mixes had a water to cement ratio of 1:2 and a sand to cement ratio of 2.5:1. Six mixtures were prepared with different HSA amounts of 0%, 10%, 20%, 30%, 40%, and 50% by volume. The compressive strength, density, and thermal properties of the mortars were investigated. The results and analyses showed that the compressive strength and density of the mortars decreased with increasing HSA amounts. The thermal conductivity of HSA mortars slightly decreased for increasing levels of HSA. In addition, HSA mortars showed a significant increase in time lags when the HSA content increased, up to approximately 165% to 197% higher than that of the control mortars. HSA levels in mortars can play an important role in improving the heat conductance into buildings.bottom ash, heat storage aggregate, paraffin, phase change materials, thermal properties | INTRODUCTIONRecently, energy demand has increased rapidly due to economic growth, and is responsible for decreasing fossil fuel resources in the world. 1 Around 35% of total

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Underground energy storage utilizing concrete building foundation: Experimental and numerical approach

Cited by 5 publications

References 24 publications

Deformation Analysis and Research of Building Envelope by Deep Learning Technology under the Reinforcement of the Diaphragm Wall

Deformation Analysis and Research of Building Envelope by Deep Learning Technology under the Reinforcement of the Diaphragm Wall

Underground Energy Storage Utilizing Building Concrete Foundation with PCMs: Experimental and Numerical Approach

Improvement of thermal performance of mortars by using heat storage aggregate made with industrial by‐product to reduce cooling load

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