Article
Green & Sustainable Science & Technology
Pushpendra Kumar Singh Rathore, Shailendra Kumar Shukla
Summary: This study investigated the combined effect of loading Expanded Graphite and Expanded Vermiculite on the low-cost PCM, and explored the performance of ss-CPCM. The experiment found that adding 7% EG can increase the thermal conductivity of ss-CPCM, significantly improve its heating and cooling rates, and demonstrate good thermal stability and the ability to regulate indoor temperature.
Article
Energy & Fuels
Prakhar Dixit, Jagadeeswara Reddy Vennapusa, Sumit Parvate, Jitendra Singh, Aravind Dasari, Sujay Chattopadhyay
Summary: A phase change material (PCM) composite was prepared by impregnating propyl palmitate in expanded perlite for thermal buffering in building applications. The composite showed stable phase change enthalpy and thermal stability during 1000 thermal cycles, with the model-predicted temperatures closely matching experimental values. COMSOL Multiphysics 5.5 simulation further validated the thermal buffering performance of the composite in building applications.
Article
Energy & Fuels
Yingjie Huo, Ting Yan, Xiaole Chang, Weiguo Pan
Summary: In this study, a CuS with a flower ball shape was synthesized and loaded onto cotton yarn to develop a photosensitive interfacial material with excellent photothermal conversion properties. Four sandwich-shaped photothermal composite phase change materials (CPCMs) were prepared using different ratios of expanded graphite (EG) and 1-octadecanol (OC). The developed CPCMs exhibited good thermal storage performance, photothermal conversion efficiency, and thermal stability, showing potential for solar thermal storage applications.
Article
Energy & Fuels
Pushpendra Kumar Singh Rathore, Krishna Kumar Gupta, Bhaskar Patel, R. K. Sharma, Naveen Kumar Gupta
Summary: This study presents a comprehensive analysis of the thermal energy storage performance of beeswax as a phase change material. The addition of bentonite clay and graphite as additives improved the stability and thermal conductivity of the material.
JOURNAL OF ENERGY STORAGE
(2023)
Review
Construction & Building Technology
Pushpendra Kumar Singh Rathore, Naveen Kumar Gupta, Devanand Yadav, Shailendra Kumar Shukla, Sanjay Kaul
Summary: This study discusses the thermophysical properties of building envelope and building materials, with a focus on the applicability of phase change materials (PCM) in building envelopes. It provides an overview of the latest literature in which PCM is directly incorporated in building materials and offers future recommendations based on identified research gaps.
SUSTAINABLE CITIES AND SOCIETY
(2022)
Review
Environmental Sciences
Ravin Sehrawat, Ravinder Kumar Sahdev, Sumit Tiwari
Summary: This study explores the uncertainty in the demand and supply of solar energy due to different geographical regions and proposes the utilization of various thermal energy storage systems to overcome this issue. Phase change materials (PCMs) are preferred for their high-energy storage density, although their low thermal conductivity is a challenge. To address this, metallic foam, carbon fiber, and metallic fins are integrated into the PCM container. The inclusion of metallic foam, limited to 0.1-3% of the PCM weight, slightly impacts thermal conductivity but increases costs. Additionally, adding carbon at 0.1-9% of the PCM weight improves PCM performance. The inclusion of metallic fins enhances thermal conductivity, with different shapes and sizes. Studies indicate that metallic foam composites outperform carbon composites and metallic fins.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Environmental
Jiaming Bao, Deqiu Zou, Sixian Zhu, Qun Ma, Yinshuang Wang, Yunping Hu
Summary: An innovative technique was presented to encapsulate phase change materials by constructing a thermal expansion void inside microencapsulated phase change materials (MEPCMs) through a "double-layer coating, sacrificial inner layer" method. This method improves the thermal performance and thermal cycle life of MEPCMs, providing a solution to the rupture problem caused by the thermal expansion of phase change materials. It also offers a new perspective for the microencapsulation of other metals at medium or high temperatures.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Green & Sustainable Science & Technology
Yadong Bian, Kejian Wang, Julian Wang, Yongsheng Yu, Mingyue Liu, Yajun Lv
Summary: Researchers developed a strong adsorbent expanded perlite-aerogel (AEP) composite matrix to address the poor thermal stability and leakage issues of PCMs, demonstrating excellent adsorption rate and thermal stability.
Article
Green & Sustainable Science & Technology
M. Samykano
Summary: Thermal energy storage using phase change materials (PCM) has shown great potential in addressing energy fluctuation issues in solar energy. However, the low thermal conductivity of PCM hinders its storage and heat transfer capabilities. Recent research has focused on thermally enhanced PCMs as a solution for improving thermal conductivity and heat transfer. Various techniques such as increasing heat transfer surface area, using highly conductive porous foam materials, and utilizing nano dispersed PCMs have been explored. The use of porous materials/foam dispersed PCM has shown significantly improved heat transfer and storage capacity. Additionally, organic PCMs are widely used due to their long-term stability, low or no supercooling, low or no corrosion, and recyclability.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Engineering, Environmental
Ke Lei, Jiaming Bao, Xiangyu Zhao, Hao Wang, Deqiu Zou
Summary: The research demonstrates that loading nano-Fe into the core material can effectively suppress supercooling in metal-based MEPCM, with the best effect achieved at a concentration of 0.9%. A particle size of 50 nm showed better supercooling suppression compared to 100 nm.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Energy & Fuels
Zhixuan Fan, Yunchao Zhao, Xuying Liu, Yu Shi, Dahua Jiang
Summary: In this study, a ternary eutectic of lauric acid, palmitic acid, and paraffin was prepared and adsorbed into expanded perlite to form a composite phase change material. The LPP/EP material showed superior thermal properties, good thermal stability, and better thermal storage performance compared to EP alone.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Energy & Fuels
Wondu Lee, Jooheon Kim
Summary: This study prepared novel phase change material composites with high thermal conductivity and latent heat by grafting palmitic acid and expanded graphite onto poly(dimethylsiloxane) (PDMS). These composites show potential in thermal management and electronic packaging fields.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Thermodynamics
Jerome Soto, Mariam Jadal, Nicolas de Guyenro, Didier Delaunay
Summary: The study shows that during thermal aging of the paraffin-compressed expanded natural graphite (CENG) composite, phase change causes structural expansion, but has a non-significant impact on heat transfer rate. Delamination mainly affects the thermal conductivity in the axial direction, while heat transfer predominantly occurs in the planar direction.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2021)
Article
Energy & Fuels
Takahiro Kawaguchi, Hiroki Sakai, Ryosuke Ishida, Yuto Shimizu, Ade Kurniawan, Takahiro Nomura
Summary: This study presents an improved method for the preparation of microencapsulated PCM with high heat storage density and cyclic durability, showing promise for future medium-to-high temperature heat applications.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Energy & Fuels
Chao Ma, Jing Wang, Yu Wu, Yongchao Wang, Zhijiang Ji, Shuai Xie
Summary: The main aim of this paper is to enhance the thermal conductivity of erythritol as phase change material. By incorporating expanded graphite and calcium pimelate, the composite PCM shows improved cycle stability and significantly enhanced thermal conductivity, making it a promising candidate for waste heat recovery and solar energy medium temperature heat collection.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Environmental Sciences
Shi-Wei Liu, Xiaoming Wang, Lu Zhang, Wei-Ming Kong, Hong-Kai Gao, Cun-De Xiao
Summary: The study investigates the effects of glaciers on runoff in 25 upstream catchments of the Tarim River Basin in western China. The findings show that considering glacier mass balance and glacier fraction improves the performance of the Budyko framework, especially for catchments with a high glacier fraction.
ADVANCES IN CLIMATE CHANGE RESEARCH
(2022)
Review
Green & Sustainable Science & Technology
Janitha Migunthanna, Pathmanathan Rajeev, Jay Sanjayan
Summary: Geopolymer binders using waste clay bricks as a precursor material show promising potential for use in pavement construction as an alternative cementitious material. Blending waste clay bricks with other materials or using them as the sole precursor can enhance the mechanical properties of geopolymer binders. Further research is recommended to explore the development, durability, and field performance of geopolymer concrete.
Article
Construction & Building Technology
Kala Kondepudi, Kolluru V. L. Subramaniam, Behzad Nematollahi, Shin Hau Bong, Jay Sanjayan
Summary: The rheological behavior of concrete mixtures made with AAFS binder paste was investigated, and its relation with 3D Concrete Printing performance was analyzed. The thixotropy of the mixtures mainly depended on the composition of the AAFS binder paste, regardless of aggregate content. Additives like nano-clay were used to control the rheology of the paste and enhance internal structure buildup. The yield stress of the concrete mixture was influenced by paste content, aggregate surface area, and solid packing.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Construction & Building Technology
Sayanthan Ramakrishnan, Sasitharan Kanagasuntharam, Jay Sanjayan
Summary: In-line activation of cementitious materials by encapsulating and introducing accelerators has been studied in this research. The results showed that the encapsulated accelerator rapidly transformed the concrete from a pumpable state to a stiffened state with improved mechanical properties. The flowability of the fresh printable mix was maintained before activation. The study also found that the homogeneity of the concrete reduced with increasing capsule dosage.
CEMENT & CONCRETE COMPOSITES
(2022)
Review
Green & Sustainable Science & Technology
Darshana Jayasooriya, Pathmanathan Rajeev, Jay Sanjayan
Summary: This study investigates the effects of graphene and graphene oxide on cement-based composites, particularly continuously reinforced concrete pavements (CRCP). Graphene-based nanomaterials show promise in overcoming various CRCP distresses, and the possibilities and hinderances of using graphene as reinforcement in cement-based composites are discussed. The potential of using graphene in CRCP is explored.
Article
Construction & Building Technology
Arun R. Arunothayan, Behzad Nematollahi, Kamal H. Khayat, Akilesh Ramesh, Jay G. Sanjayan
Summary: The rheological behavior of 3DP-UHPFRC was investigated, and it was found that the inclusion of steel fibers and nano-clay reduced workability and increased static yield stress, dynamic yield stress, and apparent viscosity. However, the effects became negligible at higher fiber or NC contents.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Construction & Building Technology
Nan Zhang, Jay Sanjayan
Summary: This study presents theoretical formulations for concrete extrusion resistance as a function of nozzle parameters. Results show that the extrusion resistances are related to the extrusion velocity of concrete and the cone angle and length of the nozzle. Based on the results, a customized nozzle was used to investigate the effects of print parameters on printing quality. It was found that the reduction of printing speed increased the limits of layer thickness.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Construction & Building Technology
Kirubajiny Pasupathy, Sayanthan Ramakrishnan, Jay Sanjayan
Summary: This study investigates the feasibility of alkali-activated brick waste powder as a binder for 3D printable geopolymer mixes. The effects of brick waste content on the fresh properties and hardened properties of the mixes were studied. The results showed that the fresh properties of the printable mixes improved with the addition of brick waste, while the hardened properties were affected by the content of brick waste.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Automation & Control Systems
Boda Ning, Qing-Long Han, Qiang Lu, Jay Sanjayan
Summary: This article focuses on the cooperative control of double-integrator type multirobot systems with uncertain control gain. Three different collective behaviors are investigated, including leaderless consensus, leader-following consensus, and formation control. Novel continuous controllers are designed based on sliding variables to achieve finite-time state agreement and leader tracking. Experimental studies are conducted to demonstrate the effectiveness of the proposed controllers for formation control of nonholonomic mobile robots.
IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS
(2023)
Article
Construction & Building Technology
K. Dhasindrakrishna, Kirubajiny Pasupathy, Sayanthan Ramakrishnan, Jay Sanjayan
Summary: The effects of dosage and alkali treatment of hemp fibre (HF) on the properties of alkali-activated cement foam (AACF) were investigated. Alkali-treated HF increased compressive and flexural strength, with the optimum dosage being 0.7%. However, HF did not improve the fire resistance at higher temperatures, causing a higher proportion of strength loss compared to the control.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Dileep Kumar, Morshed Alam, Abhijeet Jayeshbhai Doshi
Summary: This study investigated the impact of integrating phase change materials (PCM) into lightweight concrete (LWC) panels on thermal comfort and energy use in buildings. Experimental measurements were used to simulate overheating and energy consumption of six different LWC panels with varying thermal conductivity and storage. The results showed that thermal mass has a greater influence on severe discomfort hours than thermal resistance, but this influence depends on the panel's position relative to the insulation layer. The presence of insulation reduced energy savings, and cooling energy consumption was more influenced by thermal mass while heating was more influenced by wall resistance.
Article
Construction & Building Technology
Nan Zhang, Jay Sanjayan
Summary: Quick mixing technology at the nozzle is a potential approach to improve productivity in 3D concrete printing. This study investigated the effects of rheological modifiers, CMC and nano-clay, on concrete mixing. Results showed that mixing resistance varied with different modifiers, with CMC being more influential. The quick mixing method resulted in better dispersion of modifiers but required more energy.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Construction & Building Technology
Nan Zhang, Jay Sanjayan
Summary: Quick Nozzle Mixing is a technique that solves the conflicting rheological requirements of buildability and pumpability in 3D concrete printing. The study investigates the mixing mechanism of concrete and the properties of mixing water with five surfactants. The results show that the surfactants play a significant role in mixing efficiency, with varying degrees of wetting ability.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Construction & Building Technology
Sasitharan Kanagasuntharam, Sayanthan Ramakrishnan, Shravan Muthukrishnan, Jay Sanjayan
Summary: This study explores the use of magneto-rheological additives in 3D concrete printing to improve buildability. Carbonyl iron powder (CIP) was used as the additive, and two magnetic activation strategies were considered. The study found that CIP significantly increased the static yield strength of fresh mixtures when the magnetic field was continuously present. However, short-duration exposure to the magnetic field had only a slight effect on the yield strength. The inclusion of CIP also improved the compressive strength and reduced the volume of permeable voids in hardened mixtures, but excessive CIP dosage resulted in strength reductions.
JOURNAL OF BUILDING ENGINEERING
(2023)
Review
Construction & Building Technology
Roshan Jayathilakage, Pathmanathan Rajeev, Jay Sanjayan
Summary: This study provides a comprehensive review of traditional and non-traditional methods for characterizing the rheological parameters of 3D concrete printing (3DCP) material. Experimental studies were conducted to compare different testing methods and identify their similarities, dissimilarities, pros, and cons. It was found that standard rheology measurement techniques have limitations when used for 3DCP material due to its unique properties, and non-conventional and novel techniques are needed for accurate rheological characterization.
Article
Energy & Fuels
Shitong Fang, Houfan Du, Tao Yan, Keyu Chen, Zhiyuan Li, Xiaoqing Ma, Zhihui Lai, Shengxi Zhou
Summary: This paper proposes a new type of nonlinear VIV energy harvester (ANVEH) that compensates for the decrease in peak energy output at low wind speeds by introducing an auxiliary structure. Theoretical and experimental results show that ANVEH performs better than traditional nonlinear VIV energy harvesters under various system parameter variations.
Article
Energy & Fuels
Wei Jiang, Shuo Zhang, Teng Wang, Yufei Zhang, Aimin Sha, Jingjing Xiao, Dongdong Yuan
Summary: A standardized method was developed to evaluate the availability of solar energy resources in road areas, which combined the Analytic Hierarchy Process (AHP) and the Geographic Information System (GIS). By analyzing critical factors and using a multi-indicator evaluation method, the method accurately evaluated the utilization of solar energy resources and guided the optimal location selection for road photovoltaic (PV) projects. The results provided guidance for the application of road PV projects and site selection for route corridors worldwide, promoting the integration of transportation and energy.
Article
Energy & Fuels
Chang Liu, Jacob A. Wrubel, Elliot Padgett, Guido Bender
Summary: The study investigates the effects of coating defects on the performance of the anode porous transport layer (PTL) in water electrolyzers. The results show that an increasing fraction of uncoated regions on the PTL leads to decreased cell performance, with continuous uncoated regions having a more severe impact compared to multiple thin uncoated strips.
Article
Energy & Fuels
Marcos Tostado-Veliz, Xiaolong Jin, Rohit Bhakar, Francisco Jurado
Summary: In this paper, a coordinated charging price mechanism for clusters of parking lots is proposed. The research shows that enabling vehicle-to-grid characteristics can bring significant economic benefits for users and the cluster coordinator, and vehicle-to-grid impacts noticeably on the risk-averse character of the uncertainty-aware strategies. The developed pricing mechanism can reduce the cost for users, avoiding to directly translate the energy cost to charging points.
Article
Energy & Fuels
Duan Kang
Summary: Building an energy superpower is a key strategy for China and a long-term goal for other countries. This study proposes an evaluation system and index for measuring energy superpower, and finds that China has significantly improved its ranking over the past 21 years, surpassing other countries.
Article
Energy & Fuels
Fucheng Deng, Yifei Wang, Xiaosen Li, Gang Li, Yi Wang, Bin Huang
Summary: This study investigated the synergistic blockage mechanism of sand and hydrate in gravel filling layer and the evolution of permeability in the layer. Experimental models and modified permeability models were established to analyze the effects of sand particles and hydrate formation on permeability. The study provided valuable insights for the safe and efficient exploitation of hydrate reservoirs.
Article
Energy & Fuels
Hao Wang, Xiwen Chen, Natan Vital, Edward Duffy, Abolfazl Razi
Summary: This study proposes a HVAC energy optimization model based on deep reinforcement learning algorithm. It achieves 37% energy savings and ensures thermal comfort for open office buildings. The model has a low complexity, uses a few controllable factors, and has a short training time with good generalizability.
Article
Energy & Fuels
Moyue Cong, Yongzhuo Gao, Weidong Wang, Long He, Xiwang Mao, Yi Long, Wei Dong
Summary: This study introduces a multi-strategy ultra-wideband energy harvesting device that achieves high power output without the need for external power input. By utilizing asymmetry, stagger array, magnetic coupling, and nonlinearity strategies, the device maintains a stable output voltage and high power density output at non-resonant frequencies. Temperature and humidity monitoring are performed using Bluetooth sensors to adaptively assess the device.
Article
Energy & Fuels
Tianshu Dong, Xiudong Duan, Yuanyuan Huang, Danji Huang, Yingdong Luo, Ziyu Liu, Xiaomeng Ai, Jiakun Fang, Chaolong Song
Summary: Electrochemical water splitting is crucial for hydrogen production, and improving the hydrogen separation rate from the electrode is essential for enhancing water electrolyzer performance. However, issues such as air bubble adhesion to the electrode plate hinder the process. Therefore, a methodology to investigate the two-phase flow within the electrolyzer is in high demand. This study proposes using a microfluidic system as a simulator for the electrolyzer and optimizing the two-phase flow by manipulating the micro-structure of the flow.
Article
Energy & Fuels
Shuo Han, Yifan Yuan, Mengjiao He, Ziwen Zhao, Beibei Xu, Diyi Chen, Jakub Jurasz
Summary: Giving full play to the flexibility of hydropower and integrating more variable renewable energy is of great significance for accelerating the transformation of China's power energy system. This study proposes a novel day-ahead scheduling model that considers the flexibility limited by irregular vibration zones (VZs) and the probability of flexibility shortage in a hydropower-variable renewable energy hybrid generation system. The model is applied to a real hydropower station and effectively improves the flexibility supply capacity of hydropower, especially during heavy load demand in flood season.
Article
Energy & Fuels
Zhen Wang, Kangqi Fan, Shizhong Zhao, Shuxin Wu, Xuan Zhang, Kangjia Zhai, Zhiqi Li, Hua He
Summary: This study developed a high-performance rotary energy harvester (AI-REH) inspired by archery, which efficiently accumulates and releases ultralow-frequency vibration energy. By utilizing a magnetic coupling strategy and an accumulator spring, the AI-REH achieves significantly accelerated rotor speeds and enhanced electric outputs.
Article
Energy & Fuels
Yi Yang, Qianyi Xing, Kang Wang, Caihong Li, Jianzhou Wang, Xiaojia Huang
Summary: In this study, a novel hybrid Quantile Regression (QR) model is proposed for Probabilistic Load Forecasting (PLF). The model integrates causal dilated convolution, residual connection, and Bidirectional Long Short-Term Memory (BiLSTM) for multi-scale feature extraction. In addition, a Combined Probabilistic Load Forecasting System (CPLFS) is proposed to overcome the inherent flaws of relying on a single model. Simulation results show that the hybrid QR outperforms traditional models and CPLFS exceeds the best benchmarks in terms of prediction accuracy and stability.
Article
Energy & Fuels
Wen-Jiang Zou, Young-Bae Kim, Seunghun Jung
Summary: This paper proposes a dynamic prediction model for capacity fade in vanadium redox flow batteries (VRFBs). The model accurately predicts changes in electrolyte volume and capacity fade, enhancing the competitiveness of VRFBs in energy storage applications.
Article
Energy & Fuels
Yuechao Ma, Shengtie Wang, Guangchen Liu, Guizhen Tian, Jianwei Zhang, Ruiming Liu
Summary: This paper focuses on the balance of state of charge (SOC) among multiple battery energy storage units (MBESUs) and bus voltage balance in an islanded bipolar DC microgrid. A SOC automatic balancing strategy is proposed considering the energy flow relationship and utilizing the adaptive virtual resistance algorithm. The simulation results demonstrate the effectiveness of the proposed strategy in achieving SOC balancing and decreasing bus voltage unbalance.
Article
Energy & Fuels
Raad Z. Homod, Basil Sh. Munahi, Hayder Ibrahim Mohammed, Musatafa Abbas Abbood Albadr, Aissa Abderrahmane, Jasim M. Mahdi, Mohamed Bechir Ben Hamida, Bilal Naji Alhasnawi, A. S. Albahri, Hussein Togun, Umar F. Alqsair, Zaher Mundher Yaseen
Summary: In this study, the control problem of the multiple-boiler system (MBS) is formulated as a dynamic Markov decision process and a deep clustering reinforcement learning approach is applied to obtain the optimal control policy. The proposed strategy, based on bang-bang action, shows superior response and achieves more than 32% energy saving compared to conventional fixed parameter controllers under dynamic indoor/outdoor actual conditions.
