Article
Energy & Fuels
Soroush Entezari, Amin Taheri, Meysam Khatibi, Hamid Niazmand
Summary: This study introduces a novel triplex-tube helical-coil thermal energy storage unit and utilizes numerical simulations to assess its performance, showing a significant reduction in melting time compared to conventional units. A tilt angle of 0 degrees demonstrates the best performance, and the addition of Al2O3 nanoparticles to PCM proves to be the most effective in reducing melting time.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Energy & Fuels
Maryam Fallah Najafabadi, Mousa Farhadi, Hossein Talebi Rostami
Summary: This research investigates the application of a 3-D double-pipe helical coil heat exchanger containing Phase-Change Material (PCM) as a thermal storage system in solar water heaters. The study reveals that the inlet temperature and inner and outer pipe diameter are critical factors for the design of the storage system.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Thermodynamics
Wenzhu Lin, Ziye Ling, Xiaoming Fang, Zhengguo Zhang
Summary: The thermal performance of a novel spiral-tube heat exchanger latent heat thermal energy storage unit was investigated experimentally and numerically. Results showed an average power higher than 2 kW during the discharging process, and the heat transfer coefficient and area varied with flow rate. A numerical model validated phase change behavior, demonstrating the unit's compact structure and high heat transfer area.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Dario Guarda, Jorge Martinez-Garcia, Benjamin Fenk, David Schiffmann, Damian Gwerder, Anastasia Stamatiou, Jorg Worlitschek, Simone Mancin, Philipp Schuetz
Summary: To understand and monitor the phase-change behavior of Phase Change Materials (PCMs), a new method for measuring liquid fraction is proposed in this study. By using X-ray Computed Tomography (XCT), the solidification process of eicosane was dynamically studied and the volumetric liquid fraction was extracted. A CFD model based on the enthalpy-porosity method was implemented to simulate the solidification of eicosane, and the numerical results showed excellent agreement with the experimental data. This novel experimental methodology opens new possibilities to characterize and understand the solid-liquid phase transition process of PCMs.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Sangeeta S. Mundra, Sujit S. Pardeshi
Summary: This work investigates the heat transfer performance of a horizontal energy storage unit with the addition of high heat conducting Graphene Nanoplatelets (GNP). Numerical and experimental results show that the addition of GNP to the phase change material (PCM) can improve the charging-discharging performance, reducing the duration and enhancing the overall system performance.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Akshat Patel, Vivek Kumar Singh
Summary: This study aims to improve the energy release and storage rate of PCM heat sinks by employing a novel PCM heat sink with double-sided spiral fins. The results show that increasing the diameter and length of the fins reduces the critical temperature and time taken to reach initial conditions. The best configuration of spiral fins reduces the critical temperature and time by 7 K and 19 mins, respectively, compared to traditional pin fins.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Shahin Faghiri, Rouhollah Ahmadi, Shahin Akbari, Mohammad Behshad Shafii
Summary: This study uses a reliable 3D numerical simulation to investigate the charging process of paraffin as the phase change material in a double spirally coiled tube heat exchanger with two separated paths. The effects of operational and geometrical factors on the behavior of the latent thermal energy storage system during the melting process are analyzed. The results show that reducing the radius of the inner spiral tube decreases the melting capability of PCM at the beginning of the charging process but improves efficiency at later stages. The overall time required for 95 wt% PCM melting in the storage decreases by 126% when the radius of the inner spiral tube is reduced from 90 mm to 50 mm.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Thermodynamics
Muhammad Shahid Shafiq, Muhammad Mahabat Khan, Muhammad Irfan
Summary: The study investigates the impact of various fin designs on the performance of a thermal energy storage unit. Different fin angles, shapes, and lengths can significantly affect the melting rate and energy storage efficiency of the phase change material. Optimal fin configurations can greatly enhance the overall performance of the system.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
Mingming Wu, Chenzhen Liu, Zhonghao Rao
Summary: This study proposes a bilayer material based on lauric acid with good thermal conductivity and photothermal conversion performance to solve the limited application of PCM in buildings. The optimal ratio of the upper layer material with photothermal conversion performance is 100:5:1 (LA:CB:SDS), and the optimal ratio of the lower layer material is 100:1.4 (LA:EG). Experimental and numerical simulation results show that this bilayer material can significantly improve the heating rate both inside and outside the building, achieving the purpose of energy saving and emission reduction.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
Yutao Huo, Xiaowen Pang, Zhonghao Rao
Summary: Optimizing the placement of heat sources and adjusting the Rayleigh number can enhance heat transfer efficiency in thermal energy storage systems using phase change materials during melting and solidification processes.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Energy & Fuels
N. A. Aziz, N. A. M. Amin, M. S. A. Majid, F. Bruno, M. Belusko
Summary: This paper presents parametric studies on a packed-bed phase change material encapsulated in spheres to optimize its energy storage effectiveness. By varying the tank's length, radius, number of spheres, and sphere diameter, the study identified the optimum design that yielded the maximum energy storage effectiveness. The investigation concluded that lower length and radius values, as well as smaller sphere diameter, contributed to higher phase-change and storage effectiveness.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Energy & Fuels
Yasser Harmen, Younes Chhiti, Maryam El Fiti, Mustapha Salihi, Charafeddine Jama
Summary: The eccentricity of shell and tube heat exchanger (STHE) has a significant impact on the performance of thermal energy storage (TES) systems with phase change materials (PCM). In this study, it was found that eccentric charge performance is better than concentric arrangement, with optimal eccentricities of 6 and 10 for single-tube and multi-tube systems, respectively. By optimizing the eccentricity, the total melting time of the four-tube, three-tube, two-tube, and single-tube systems were reduced by 63%, 63%, 60%, and 54% compared to concentric cases, respectively. Additionally, the total solidification time of the single-tube case was reduced by 56%, 52%, and 49% compared to the four-tube, three-tube, and two-tube cases.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Energy & Fuels
M. Ismail, W. K. Zahra, Shinichi Ookawara, Hamdy Hassan
Summary: Integrating phase change materials with air conditioning systems can improve AC performance and reduce energy consumption. The study shows that using a cylindrical configuration can enhance the charging efficiency of phase change materials at night and increase energy savings in air conditioning.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Thermodynamics
Ming-Hsuan Hu, Tianhao Xu, Justin NW. Chiu
Summary: This study compares the performance of two primary LHTES packing methods, encapsulation and bulk PCM storage, and evaluates the impact of heat transfer fluid flowrate on energy storage performance. The results show that the time-varying flowrate control can provide the required power, and partial charging/discharging exhibits higher mean thermal power than full charge/discharge. Additionally, the slab-encapsulated PCM storage unit has a shorter completion time, while the SCHE based unit has a higher energy storage density.
APPLIED THERMAL ENGINEERING
(2022)
Article
Energy & Fuels
Alessio Tafone, Emiliano Borri, Luisa F. Cabeza, Alessandro Romagnoli
Summary: Electricity storage is crucial for sustainable energy goals and integrating renewable sources, and liquid air energy storage systems depend greatly on the performance of high grade cold storage and potential of phase change materials to increase energy density. The introduction of PCM into the system mitigates thermocline effects, improves discharge efficiency, and reduces specific consumption, leading to a shorter payback period and more attractive economic investment.
Article
Thermodynamics
Solaimalai Raja Rakkappan, Suresh Sivan, B. Praveen, M. Naarendharan, P. Sai Sudhir
Summary: This study measured the heat of dissociation of tetra-n-butyl ammonium bromide semi-clathrate hydrates, as well as the thermal conductivity and specific heat of TBAB aqueous solutions and solidified solutions for various weight fractions. The experiment showed that diameter and wall temperature influenced charging and discharging performance, with higher diameter capsules providing better performance.
JOURNAL OF CHEMICAL THERMODYNAMICS
(2021)
Article
Chemistry, Physical
Solaimalai Raja Rakkappan, Suresh Sivan, Vignesh Pethurajan, A. Aditya, Harshit Mittal
Summary: This study focused on improving the performance of heat transfer fluid system by utilizing encapsulated phase change material slurries (EPCMS), particularly analysing the potential usage of low-cost organic PCM 1-Decanol encapsulated in urea-formaldehyde shell (UFS). The prepared discrete and uniformly shaped EPCM capsules and modified EPCMM with nanoparticles showed enhanced thermal response, with SEM analysis indicating different surface morphologies based on the type of nanoparticles used. Experimental results proved that EPCMM with 6 wt% GnP and 10 wt% CuO exhibited the most suitable thermal characteristics, demonstrating its applicability in low-temperature heat transfer fluid applications.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Energy & Fuels
Vikesh Sathyamurthy, Sankar Gopalan, Sivan Suresh, Balasubramanian Karuppudayar Ramaraj, Santhosh Kumar Deenadayalan
Summary: Thermo gravimetric analysis (TGA) is widely used for estimating devolatilization rates and measuring char reactivity in coal. This study found that the most accurate method for analyzing TGA data for high-ash Indian coal is FWO.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2021)
Article
Thermodynamics
Mohamed Ibrahim N.H., M. Udayakumar, Sivan Suresh, Suvanjan Bhattacharyya, Mohsen Sharifpur
Summary: This study investigates the insights of soot formation in ethylene/hydrogen/nitrogen diffusion jet flame, including soot volume fraction as a function of flame-normalized length and various soot formation rates. The originality of this study lies in coupling LES turbulent model with chemical equilibrium diffusion combustion and conducting SVF and its insights study for different Reynolds number configurations.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2021)
Article
Thermodynamics
R. Anish, V Mariappan, S. Suresh, Mahmood Mastani Joybari, Ammar M. Abdulateef
Summary: The study investigates the use of thermal energy storage systems to address the intermittence of renewable energy sources, focusing on analyzing the heat transfer efficiency and performance of compact spiral coil thermal storage units. Experimental data shows that in this storage unit, the processes of heat storage and discharge of xylitol are mainly governed by natural convection and conduction, respectively.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Green & Sustainable Science & Technology
R. Anish, Mahmood Mastani Joybari, Saeid Seddegh, V Mariappan, Fariborz Haghighat, Yanping Yuan
Summary: This study investigated the heat transfer mechanism in a horizontal shell and multi-finned tube heat exchanger through numerical simulation, finding that design parameters such as the number of tubes, fin height, and rotation of fins and tubes significantly affect the storage performance.
Article
Energy & Fuels
Ammar M. Abdulateef, Marek Jaszczur, Qusay Hassan, R. Anish, Hakeem Niyas, Kamaruzzaman Sopian, Jasim Abdulateef
Summary: The experimental results showed that melting Paraffin completely was faster when using double-side heating, and the melting time varied with different charging temperatures. Compared to pure Paraffin, using nanoparticles and fin structures in the thermal energy storage system can improve the melting performance of Paraffin.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Materials Science, Multidisciplinary
H. Vishnu Nandan, R. Anish, G. Jayaprasad, Subin Sunny, Jackson Scaria Jomon, R. Shibin, J. B. Sajin
Summary: Increasing concerns about environmental pollution have prompted researchers to seek sustainable alternatives. This study focuses on the fabrication and experimental validation of a hybrid bio composite using coir and cotton fiber reinforcement dispersed in a paper matrix. The results show that the specimen with 20 wt% coir has better tensile strength and Izod impact value compared to the standard sample, while maintaining thermal stability comparable to conventional packaging materials.
Proceedings Paper
Materials Science, Multidisciplinary
R. Anish, V. Mariappan, P. S. Hitha, B. S. Arun
Summary: An experimental study was conducted to analyze the melting behavior of erythritol in an energy storage unit with multi-finned tubes. The melting of PCM was mainly influenced by natural convection, leading to a faster melting process. Storage unit with longitudinal multiple tubes showed the best thermal performance and significant increase in the rate of PCM melting during the charging process.
MATERIALS TODAY-PROCEEDINGS
(2021)
Proceedings Paper
Materials Science, Multidisciplinary
P. Sarafoji, V. Mariappan, R. Anish, K. Karthikeyan, Jayabharata Reddy
Summary: This study presents the performance and evaluation of phase change material in the Prototype Solar Cold Storage (PSCS) system. Experimental results showed that PCM has a high charging speed and insulation effect, which can effectively replace part of the total power consumption. Furthermore, these technologies can also be used for solar PV generation and reduction of greenhouse gas emissions.
MATERIALS TODAY-PROCEEDINGS
(2021)
Proceedings Paper
Materials Science, Multidisciplinary
B. S. Arun, V. Mariappan, R. Anish, P. Nimisha
Summary: An experimental investigation was conducted to evaluate the performances of air-to-air heat exchanger and regenerative evaporative cooler under low and high humidity. The heat exchanger functions as a sensible heat recovery ventilator under low humidity and as a dehumidifier for the evaporative cooler under high humidity. Results showed that the temperature below the wet-bulb temperature of intake air is achieved under low humidity conditions.
MATERIALS TODAY-PROCEEDINGS
(2021)
Proceedings Paper
Materials Science, Multidisciplinary
K. Karthikeyan, V. Mariappan, R. Anish, P. Sarafoji, M. Jaya Bharata Reddy
Summary: The study synthesized a mixture for low temperature PCM and conducted experiments in a double helical coil CTESU to analyze its charging and discharging behavior and performance parameters. Analysis showed that the developed coil improved heat transfer performance, with faster discharging rate and controlled solidification during charging process.
MATERIALS TODAY-PROCEEDINGS
(2021)
Article
Construction & Building Technology
Gabriele Bernardini, Tiago Miguel Ferreira, Pilar Baquedano Julia, Rafael Ramirez Eudave, Enrico Quagliarini
Summary: This research offers a methodology for combined spatiotemporal flood risk assessment, considering hazard, physical vulnerability, user exposure, and vulnerability. It adopts a mesoscale approach and investigates indoor and outdoor users' exposure and vulnerability, using the Analytical Hierarchy Process to combine risk factors.
SUSTAINABLE CITIES AND SOCIETY
(2024)
Article
Construction & Building Technology
Ying Liu, Chunli Chu, Ruijun Zhang, Shaoqing Chen, Chao Xu, Dongliang Zhao, Chunchun Meng, Meiting Ju, Zhi Cao
Summary: This study investigates the effects of increasing road, wall, and roof albedo on mitigating the urban heat island (UHI) effect in different areas of Tianjin. The results reveal that increasing road albedo is more effective in fringe areas, while increasing wall and roof albedo is more effective in central areas. The temperature changes induced by albedo changes also show seasonal characteristics.
SUSTAINABLE CITIES AND SOCIETY
(2024)
Article
Construction & Building Technology
Xisheng Lin, Yunfei Fu, Daniel Z. Peng, Chun-Ho Liu, Mengyuan Chu, Zengshun Chen, Fan Yang, Tim K. T. Tse, Cruz Y. Li, Xinxin Feng
Summary: This study employed computational fluid dynamics and neural network models to investigate and predict pollutant dispersion in urban environments, providing valuable insights for designing effective strategies to mitigate the impacts of hazardous pollutants.
SUSTAINABLE CITIES AND SOCIETY
(2024)
Article
Construction & Building Technology
Dipanjan Nag, Arkopal Kishore Goswami
Summary: Future-oriented urban planning should continue to focus on the principles of accessible and walkable cities. The perception of people is crucial for developing better urban walking infrastructure, but current evaluation tools often neglect the "perceived" features of the walking network. This study used conjoint analysis to evaluate users' perception of link and network attributes, revealing the importance of considering both in improving the walking environment.
SUSTAINABLE CITIES AND SOCIETY
(2024)
Article
Construction & Building Technology
Yongxin Su, Tao Zhang, Mengyao Xu, Mao Tan, Yuzhou Zhang, Rui Wang, Ling Wang
Summary: This study proposes an optimization method for household integrated demand response (HIDR) by combining rough knowledge and a dueling deep Q-network (DDQN), aiming to address uncertainties in a household multi-energy system (HMES). The simulation results demonstrate that the proposed method outperforms rule-based methods and DDQN in terms of energy cost savings.
SUSTAINABLE CITIES AND SOCIETY
(2024)
Article
Construction & Building Technology
Sijia Sun, S. F. A. Batista, Monica Menendez, Yuanqing Wang, Shuang Zhang
Summary: This paper comprehensively analyzes the energy consumption characteristics of electric buses (EBs) and diesel buses (DBs) on different bus lane configurations and operational conditions. The study shows that EBs consume less energy in suburban areas when using regular lanes, while both EBs and DBs save substantial energy when operating on dedicated bus lanes in downtown areas. Notably, shared-use bus lanes have the highest energy consumption.
SUSTAINABLE CITIES AND SOCIETY
(2024)
Article
Construction & Building Technology
Shangshang Shen, Dan Yan, Xiaojie Liu
Summary: This study developed a comprehensive theoretical framework for evaluating, diagnosing, and optimizing multi-functional urban agriculture. The framework was applied in Xiamen, China to identify the obstacles that impede its coordinated development and propose optimized modes for its development. Results showed that urban agriculture in Xiamen exhibits sound social function, moderate economic function, and poor ecological function.
SUSTAINABLE CITIES AND SOCIETY
(2024)
Article
Construction & Building Technology
Oluwafemi E. Adeyeri, Akinleye H. Folorunsho, Kayode I. Ayegbusi, Vishal Bobde, Tolulope E. Adeliyi, Christopher E. Ndehedehe, Akintomide A. Akinsanola
Summary: This study examines the impact of land cover, vegetation health, climatic forcings, elevation heat loads, and terrain characteristics on land surface temperature distribution over West Africa. The random forest model performs the best in downscaling predictands. The southern regions consistently exhibit healthy vegetation, while areas with unhealthy vegetation coincide with hot land surface temperature clusters. Positive Normalized Difference Vegetation Index trends in the Sahel highlight rainfall recovery and subsequent greening. Southwest winds cause the upwelling of cold waters, resulting in low land surface temperatures in southern West Africa. Considering LVCET factors is crucial for prioritizing greening initiatives and urban planning.
SUSTAINABLE CITIES AND SOCIETY
(2024)
Article
Construction & Building Technology
Yuchi Cao, Yan Li, Shouyun Shen, Weiwei Wang, Xiao Peng, Jiaao Chen, Jingpeng Liao, Xinyi Lv, Yifan Liu, Lehan Ma, Guodian Hu, Jinghuan Jiang, Dan Sun, Qingchu Jiang, Qiulin Liao
Summary: The study reveals significant disparities in urban green equity, with high property price areas having better access to green spaces than low property price areas. Landscape and greening have the most significant impact on urban green space differentiation.
SUSTAINABLE CITIES AND SOCIETY
(2024)
Article
Construction & Building Technology
Shaobo Sun, Kui Shan, Shengwei Wang
Summary: Economizer control is an important measure for energy savings in air-conditioning systems during moderate seasons. Humidity measurement uncertainties have a significant impact on enthalpy-based economizer control, and an uncertainty-tolerant control strategy is proposed to mitigate these effects.
SUSTAINABLE CITIES AND SOCIETY
(2024)
Article
Construction & Building Technology
Ding Mao, Peng Wang, Yi-Ping Fang, Long Ni
Summary: This study analyzes the structure, function, operation, and failure characteristics of district heating networks (DHNs) and proposes vulnerability analysis methods. The effectiveness of these methods is validated through application to a DHN in a Chinese city. The study finds that the heat source connectivity efficiency loss rate effectively characterizes topological and functional vulnerability. It also reveals that controllable DHNs have higher functional vulnerability under large area failure scenarios.
SUSTAINABLE CITIES AND SOCIETY
(2024)
Article
Construction & Building Technology
Hamid Karimi, Saeed Hasanzadeh, Hedayat Saboori
Summary: This paper presents a stochastic and cooperative approach for the operation of a cluster of interconnected multi-energy systems. The proposed model investigates the interaction among energy systems and integrates hydrogen and water systems into the overall energy structure. The model studies the performance of energy system agents in decentralized and cooperative scheduling.
SUSTAINABLE CITIES AND SOCIETY
(2024)
Article
Construction & Building Technology
Zhiyu Yan, Xiaogang Guo, Zilong Zhao, Luliang Tang
Summary: This study proposes a novel framework for fine-grained information extraction and dynamic spatial-temporal awareness in disaster-stricken areas based on social media data. The framework utilizes deep learning modules to extract location and water depth information from text and images, and analyzes the spatio-temporal distribution characteristics. The results show that the fusion of text and image-based information can enhance the perception of flood processes.
SUSTAINABLE CITIES AND SOCIETY
(2024)
Article
Construction & Building Technology
M. A. Pans, G. Claudio, P. C. Eames
Summary: This study simulated and optimized a speculative district heating system in an existing urban area in Loughborough, UK. The system used only renewable heat sources and thermal energy storage to address the mismatch between heat generation and demand. The study assessed the impact of long-term storage volume and charging temperature on system cost and energy efficiency.
SUSTAINABLE CITIES AND SOCIETY
(2024)
Article
Construction & Building Technology
Jianmei Zhong, Wei Zhang, Xiaoli Wang, Jinsheng Zhan, Tao Xia, Lingzhi Xie, Xiding Zeng, Kun Yang, Zhangyu Li, Ruiwen Zou, Zepu Bai, Qing Wang, Chenyang Zhang
Summary: This study aims to propose a suitable air distribution design and reduce the energy consumption of the BSL-4 laboratory. It analyzes the diffusion characteristics of aerosols, infection risk under different air distributions, and ventilation parameters. The results show that the proposed energy-saving operation strategy can reduce the energy consumption of the laboratory by 15-30%.
SUSTAINABLE CITIES AND SOCIETY
(2024)
