Related references
Note: Only part of the references are listed.
Article
Chemistry, Physical
Changnv Zeng et al.
Summary: Paraffin, high-density polyethylene (HDPE), and expanded graphite (EG) were used to produce shape-stabilized phase change material (SSPCM) plates for rebuilding granary walls. Experimental and numerical methods were used to evaluate the thermal regulation performance of the SSPCM granary walls. The optimal parameters were determined and a 30 mm thick SSPCM plate with a thermal conductivity of 0.2 W/m center dot K showed superior performance, greatly enhancing the energy-saving rate by 35.83%.
Article
Thermodynamics
Juliana Pessin et al.
Summary: In order to address Brazil's national energy crisis, geothermal energy piles (GEP) integrated with heat pumps offer an attractive and cost-effective solution for building cooling demand. However, there are limited field studies on GEP systems in Brazilian soils and climate conditions, posing a challenge for implementation. This study conducted an experimental investigation on GEPs constructed in São Paulo to provide valuable data for their design, focusing on the influence of heat exchange pipe configuration and the thermal response of GEPs in multi-layered ground. The findings highlight the significance of pipe configuration during pile heating process and the impact of soil layers on GEP temperature profile and nearby pile behavior, emphasizing the need to consider these factors in the design of GEPs.
APPLIED THERMAL ENGINEERING
(2023)
Article
Construction & Building Technology
Piotr Lapka et al.
Summary: This paper investigates the hygro-thermal properties of hemp concrete modified with gum Arabic (GA) admixture. The study examines the effects of modifying agents on density, porosity, thermal conductivity, vapor permeability, sorption/desorption curves, and capillary uptake. The findings show that the addition of GA affects density, porosity, thermal conductivity, water vapor permeability, sorption/desorption behavior, and capillary rise of hemp concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Thermodynamics
Kok Sin Woon et al.
Summary: Climate change is a major long-term threat to humanity. Transforming urban energy from carbon-intensive to carbon-free solutions is crucial for achieving carbon neutrality. This review discusses recent advances in green energy development in urban sectors, including industry, buildings, transportation, and waste treatment. It highlights the need for developing novel energy materials, improving energy storage capacity, reducing vulnerability of renewable sources, optimizing modeling, and enhancing engineering design. The challenges and recommendations for green energy development in environmental, economic, and societal aspects are summarized, along with the importance of minimizing energy consumption in waste treatment. Innovations in technology, institutional regulations, incentives, and behavioral changes are necessary for achieving carbon neutrality in urban environments.
Article
Thermodynamics
Weibo Yang et al.
Summary: In this study, a model test device with reduced size was used to investigate the thermo-mechanical behaviour of energy pile under different cyclic temperature loads. The results showed that the performance of energy pile operated in winter and summer modes was significantly affected by the cycle days. The temperature changes in the pile and soil accumulated with increasing cycle days, leading to a decrease in heat exchange and an increase in pile displacement and soil pressure. A 3-D mathematical model was established to further analyze the effects of various factors on the thermo-mechanical behaviour of energy pile. The study found that the cooling and heating cycles of energy pile with different building loads resulted in additional settlement, and the soil type had an influence on the heat exchange rate and displacement behavior of energy pile.
Article
Chemistry, Applied
Kai Chen et al.
Summary: This study investigates the cross-linking of QPI-GA coacervates with STPP to enhance their physicochemical properties. The cross-linked coacervates showed improved stability and higher retention of SPEO, making them suitable for flavor or active ingredient encapsulation.
Article
Engineering, Aerospace
Jing Sun et al.
Summary: This paper combines phase change paraffin microcapsule and aerated concrete to construct a new type of phase change aerated concrete. Four groups of specimens with different percentages of microcapsule phase change material (MPCM) were manufactured and tested for mechanical and thermal properties. The results showed that the optimal content of MPCM is 2.5%, which improves both the mechanical and thermal properties of the phase change aerated concrete.
JOURNAL OF AEROSPACE ENGINEERING
(2023)
Article
Construction & Building Technology
Wisal Ahmed et al.
Summary: The employment of recycled aggregate concrete (RAC) for sustainable infrastructure development has gained special interest due to the emphasis on resource conservation and environmental protection. This experimental study investigates the effect of elevated temperatures on the residual properties of RAC strengthened with chopped basalt fiber (BF) and pozzolana slurry treated recycled concrete aggregate (TRCA). The findings show significant enhancement in residual properties and improved matrix quality of the modified recycled concrete prepared by combined utilization of BF and TRCA.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2023)
Article
Construction & Building Technology
Mansour Ghalehnovi et al.
Summary: The bond-slip behavior between corroded reinforcing bar and concrete containing silica fume (SF) and marble waste powder (MWP) as ordinary portland cement (OPC) replacements was investigated in this study. The results showed that the bond strength between concrete and reinforcing bar increased by 27% and 13% when 10% SF and 5% or 20% MWP were used as OPC replacements, respectively. The samples containing SF and MWP also exhibited higher corrosion resistance.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2023)
Article
Construction & Building Technology
Aunchana Kijjanon et al.
Summary: This study investigates the properties of multibinder systems, including chloride penetration resistance, chloride binding capacity, electrical resistivity, and compressive strength. The results show that calcined kaolinite clay concrete performs better in terms of chloride penetration resistance and chloride binding ability compared to ordinary portland cement concrete. It also demonstrates higher compressive strength compared to OPC concrete and fly ash concrete. The ternary binder system of cement-fly ash-calcined kaolinite clay shows the best overall performance, with the C30F15 combination performing the best. Fly ash can also be beneficially integrated into the cement-calcined kaolinite clay binder system.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2023)
Article
Energy & Fuels
Kuan Zhao et al.
Summary: A novel type of microencapsulated phase change materials with excellent thermal stability and high heat storage capability were synthesized. When added to cement matrix, the building board with microPCMs showed significantly increased heat storage capacity and excellent thermal regulation performance.
Review
Energy & Fuels
Mohamed E. Zayed et al.
Summary: Accurate numerical modeling of the thermodynamic behavior of the ground heat exchanger is crucial for the optimal design of geothermal reservoirs. This paper presents the methods of numerical modeling of geothermal systems and outlines a critical review of geothermal reservoir modeling for heat extraction purposes. Various numerical methods and recent advances in parameters affecting the heat extraction performance are discussed.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Green & Sustainable Science & Technology
Xiaohua Bao et al.
Summary: Energy piles are a promising renewable energy technology for ground source heat pump systems. This study developed a concrete pile called PCM energy pile by using hollow steel balls encapsulating phase change materials (PCMs). Experimental results showed that the PCM energy pile had lower temperature changes but higher heat transfer power compared to traditional energy piles. However, the heat transfer power was influenced by the operation modes, and an optimal flow rate was required for the PCM energy pile. The proposed PCM energy pile was proven to be an effective solution for improving heat exchange capacity and conserving underground space resources.
Article
Construction & Building Technology
Osman Gencel et al.
Summary: The efficiency of solar thermal energy in cementitious mortar is enhanced by using a phase change material (PCM) with thermal energy harvesting/releasing ability. A new type of cement-based thermal energy storage mortar (CBTESM) was developed by substituting blast furnace slag (BFS)/capric acid (CA) shape-stabilized PCM (SSPCM) with varying amounts of sand. The results showed that the addition of BFS did not affect the crystalline structure of CA, and successful impregnation of melted CA into BFS was confirmed. The CBTESM samples with SSPCM additives exhibited decreased bulk density, compressive strength, and thermal conductivity. The addition of 15% SSPCM was found to meet the standard conditions in terms of compressive strength. The developed CBTESM significantly reduced indoor temperature and showed potential for energy savings and carbon emission reduction.
ENERGY AND BUILDINGS
(2022)
Article
Construction & Building Technology
Hongzhi Cui et al.
Summary: In this study, hollow steel balls are used to encapsulate phase change materials and improve the properties of concrete by adding steel fibers. The results show that increasing the steel fiber content and hollow steel ball thickness enhances the thermal conductivity and compressive strength of the concrete. However, excessive steel fiber content can lead to fiber agglomeration and decrease in thermal conductivity. Additionally, the proposed fiber-reinforced PCM-HSB concrete improves the heat capacity and bearing capacity of concrete, making it suitable for energy pile applications.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Energy & Fuels
John W. Lund et al.
Summary: Geothermal energy, as a renewable energy source, has been utilized for electricity generation and direct applications since the early 20th century. It has experienced significant growth, with many countries now operating geothermal power plants and utilizing the heat directly for various purposes. The global capacity and energy production from geothermal sources have increased steadily, providing a reliable and sustainable source of power.
Article
Construction & Building Technology
Gokhan Hekimoglu et al.
Summary: This study incorporated form-stable fly ash/lauric acid-myristic acid eutectic mixture composites into standard cement mortar to produce novel cement mortars with heat charging/discharging properties. The newly developed mortar exhibited superior thermal and mechanical characteristics, showing significant potential for thermal regulation and energy conservation in buildings.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Thermodynamics
Gokhan Hekimoglu et al.
Summary: In this study, a novel kind of cement mortar was produced with thermal energy storing/releasing properties by incorporating CA-SA eutectic PCM and SF to form FSC-PCM. The FSC-PCM showed great stability in terms of thermal properties, chemical structure, and cycling reliability. Replacement of OCM with FSC-PCM in different weight fractions resulted in improved thermoregulation performance in indoor environments, demonstrating potential for energy savings in buildings.
Article
Energy & Fuels
Renrong Li et al.
Summary: The paper presents experimental investigations on the influence of intermittent and continuous cooling on the thermal and mechanical responses of a foundation. It was found that fewer daily operating hours promoted natural ground thermal recovery and led to higher heat exchange rates with lower thermal loads on the foundation.
GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT
(2021)
Article
Multidisciplinary Sciences
Xiaohua Bao et al.
Summary: Laboratory tests were conducted on PCM energy piles and traditional concrete piles to evaluate their thermo-mechanical performance. The results showed that PCM energy piles can effectively reduce surrounding soil temperature, enhance heat storage capacity, and improve heat exchange efficiency compared to traditional concrete piles.
Review
Environmental Sciences
Saman Rashidi et al.
Summary: Geothermal energy is considered as an effective method for supplying thermal energy, with helical-shaped geothermal heat exchangers being popular due to their space-saving design and high coil density. However, installation costs remain a critical challenge for practical applications of these exchangers.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Construction & Building Technology
Zhiyong Xiong et al.
Summary: This study conducted a full scale in situ test of a large diameter over length energy pile in Nanjing, China, and found that the contribution of changes in the radial effective pressure at sand-pile interfaces to shaft friction should not be ignored during heating.
ENERGY AND BUILDINGS
(2021)
Article
Energy & Fuels
Weibo Yang et al.
Summary: Phase change concrete energy pile (PCCEP) is an underground energy structure with good thermal-mechanical performance, improving heat transfer efficiency and reducing thermal deformation, thermal stress, and pile tip soil pressure. Increasing inlet temperature enhances thermal performance but also increases pile top displacement, pile thermal stress, and pile tip soil pressure. Different intermittent operation modes show that longer operation times result in greater total heat storage capacity but lower hourly average heat storage capacity, as well as larger pile top residual displacement, pile thermal stress, and pile tip soil pressure.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Energy & Fuels
Alok Kumar Ansu et al.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2020)
Article
Engineering, Chemical
Ahmet Sari et al.
POLYMER ENGINEERING AND SCIENCE
(2020)
Article
Electrochemistry
Hong Chang et al.
JOURNAL OF NEW MATERIALS FOR ELECTROCHEMICAL SYSTEMS
(2020)
Review
Green & Sustainable Science & Technology
Abubakar Kawuwa Sani et al.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2019)
Article
Construction & Building Technology
Piti Sukontasukkul et al.
ADVANCES IN BUILDING ENERGY RESEARCH
(2019)
Article
Construction & Building Technology
Augustine Uchechukwu Elinwa et al.
CONSTRUCTION AND BUILDING MATERIALS
(2018)
Article
Biochemistry & Molecular Biology
Yuki Hasegawa et al.
Article
Thermodynamics
Sangwoo Park et al.
Review
Thermodynamics
Jevgeni Fadejev et al.
Article
Construction & Building Technology
Abdeliazim Mustafa Mohamed et al.
ADVANCES IN CIVIL ENGINEERING
(2017)
Article
Energy & Fuels
Hongzhi Cui et al.
Article
Construction & Building Technology
Augustine U. Elinwa et al.
CONSTRUCTION AND BUILDING MATERIALS
(2017)
Article
Construction & Building Technology
Zhenshuang Wang et al.
CONSTRUCTION AND BUILDING MATERIALS
(2016)
Article
Thermodynamics
Nan Wu et al.
JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER
(2016)
Article
Green & Sustainable Science & Technology
S. Focaccia et al.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2016)
Article
Construction & Building Technology
Ahmet Sari
ENERGY AND BUILDINGS
(2014)
Article
Energy & Fuels
Min Li et al.
Article
Energy & Fuels
Sedat Karaman et al.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2011)
