Article
Construction & Building Technology
Helena Vitoshkin, Vitaly Haslaysky, Mordechai Barak, Eviathar Ziffer, Avraham Arbel
Summary: Estimating the total heat flux passing through layers of materials is commonly used in determining the performance of thermal isolation. An enhanced algorithm was developed in this study to analyze the thermal properties of different screen materials and their combinations. Results showed that combining different materials can effectively reduce the U-value, with low-emissivity materials having a significant impact on reducing the U-value.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Materials Science, Textiles
Xibo Hao, Sheng Xie, Guoliang Liu
Summary: Melt blown material, with its large specific surface area, small pore, and high porosity, exhibits excellent thermal insulation performance among various fibrous materials. Understanding the factors affecting the rate of thermal transfer through melt blown material is crucial for the design and development of thermal insulation materials. A model considering heat conduction and irradiation was developed, treating the fibrous materials as homogeneous objects. Using a laboratory-scale melt blowing machine, three specimens with different porosities and fiber diameters were fabricated to evaluate the model's predictability. Numerical investigations were conducted to examine the influences of fiber diameter and fiber mat porosity on the thermal insulation properties of the melt blown fiber mat.
FIBERS AND POLYMERS
(2023)
Article
Energy & Fuels
Marwa Ammar, Ameni Mokni, Hatem Mhiri, Philippe Bournot
Summary: This paper presents a numerical investigation of an innovative design and manufacturing approach for a flat plate solar air collector operating with natural convection. The study determined the most optimized configuration for a vertically mounted collector with seven perforated TIM-PS inclined at +45 degrees. This innovative facade collector can achieve a thermal efficiency around 60% while maintaining lightweight and low cost.
Article
Construction & Building Technology
Oussama Zine, Driss Taoukil, Ikram El Abbassi, Najma Laaroussi, El-Hadj Kadri, Mohammed lhassane Lahlaouti, Abdelmajid El Bouardi
Summary: This study focuses on developing a new bio-sourced insulation material using sawdust waste. The thermal characteristics, time lag, and decrement factor of an external wall insulated with these panels were investigated. The results showed that increasing density led to an increase in thermal conductivity, thermal diffusivity, and volumetric heat capacity, while thermal diffusivity decreased. The position of the insulation layer had a significant effect on thermal inertia properties, and insulation on the outside was found to be the most desirable.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Energy & Fuels
Jalal M. Jalil, Salih M. Salih
Summary: This paper analyzes the performance of double glazed windows filled with paraffin wax in Baghdad, Iraq, aiming to evaluate the improvement in thermal comfort. The results show that the temperature of the double glazed window is significantly reduced compared to the single glass window on different floors, with reductions of 8, 6, and 5 degrees Celsius.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Polymer Science
Baolu Shi, Long Xie, Bin Ma, Zhiliang Zhou, Baosheng Xu, Lijie Qu
Summary: SiO2 aerogels with unique structural characteristics and good optical transparency have the potential to be used in aerogel glass for thermal insulation.
Article
Construction & Building Technology
Huixian Yang, Ling Zhang, Xiaosong Su, Yongqiang Luo, Zhongbing Liu, Xuchao Wang, Shaohan Qiang, Danping Pang
Summary: To achieve sustainability in the built environment, researchers have studied the optical and thermal performance of window systems with transparent insulation slats (WTIS). Factors such as the absorptivity of slat surface and the ratio of slat width to spacing were found to affect the performance of WTIS.
ENERGY AND BUILDINGS
(2022)
Article
Thermodynamics
M. A. Tawfik, M. El-Tohamy, Amany A. Metwally, A. M. Khallaf, W. E. Abd Allah
Summary: The present study aims to construct a cheap small-scale solar parabolic dish desalination system made from reused local recyclable materials without complex parts and power source. The system's unique configuration provides advantageous approach. Experimental and numerical investigations were conducted to validate the system, and the results revealed the optical efficiency and the impact of salt concentration on water production and efficiency.
APPLIED THERMAL ENGINEERING
(2022)
Article
Energy & Fuels
Jean Paul Harrouz, Kamel Ghali, Khoudor Keniar, Nesreen Ghaddar
Summary: Indoor humidity management is a challenging task, particularly in hot and humid climates, and requires a significant amount of energy. This study proposes a new method using desiccants to remove water vapor from indoor air. By utilizing thermosyphon and membrane technology, this system can sustainably regulate humidity between different areas. Mathematical models were developed and validated, and it was found that the system can effectively move moisture from high to low humidity areas under various climatic conditions. The required heat input is dependent on the membrane area and varies between 150 W to 570 W.
Article
Acoustics
Yu Gao, Kun Liu, Wenan Jiang, Yubin Fang
Summary: The sound insulation performance of a sandwich plate system (SPS) was measured and analyzed using experiments and numerical simulations. The results showed good agreement between the two methods, indicating the effectiveness of the numerical simulation approach. Additionally, the influence of different parameters on sound insulation was evaluated, with the weight of each parameter ranked accordingly. It was found that the significance of parameters varied depending on the frequency range, emphasizing the need to consider frequency ranges in structure design.
SHOCK AND VIBRATION
(2022)
Article
Thermodynamics
C. Amaral, T. Silva, F. Mohseni, J. S. Amaral, V. S. Amaral, P. A. A. P. Marques, A. Barros-Timmons, R. Vicente
Summary: By incorporating phase change materials (PCM) into rigid polyurethane (RPU) foams, the thermal regulation effect can be enhanced, with experimental results demonstrating a significant reduction in thermal amplitude for RPU panels containing PCM.
Article
Construction & Building Technology
Qi Ye, Yingchun Gong, Haiqing Ren, Lin Peng, Houjiang Zhang
Summary: This paper studied the thermal performance of CLT walls through experiments, theoretical formulas, and simulation. The heat transfer coefficient of CLT walls was measured, the influence of wall structure and thermal insulation materials was analyzed, and the heat transfer coefficient of different CLT walls was predicted. The results showed that the addition of thermal insulation materials significantly reduced the heat transfer coefficient of CLT walls.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Thermodynamics
He Liu, Jia'ao Liu, You Tian, Xuehong Wu, Zengyao Li
Summary: Pure silica aerogel has high transmittance at high temperature, so ceramic fibers with a diameter comparable to the wavelength of incident thermal radiation are introduced to reduce the radiative thermal conductivity. Aligning the fibers perpendicular to the incident radiation is the most effective way to minimize the radiative thermal conductivity, and the optimal fiber diameter decreases with increasing temperature. There exists an optimal mass fraction of doped fibers to achieve the minimized thermal conductivity due to the trade-off relationship between the conductive and radiative thermal conductivities.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
He Liu, Jia'ao Liu, You Tian, Xuehong Wu, Zengyao Li
Summary: Silica aerogel is a promising material for thermal insulation applications due to its low thermal conductivity and density. To improve its performance, ceramic fibers are introduced into the pure silica aerogel. This study developed a theoretical model to investigate the thermal conductivity of fiber-reinforced aerogel composites at high temperature, considering the inclination angle, diameter, and mass fraction of the doped fibers.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Construction & Building Technology
Abdelkoddouss El Majd, Zohir Younsi, Nicolas Youssef, Naoual Belouaggadia, Abdeslam El Bouari
Summary: This research focuses on the use of microencapsulated phase change material (MPCM) in bio-based textiles to improve the energy performance of the building envelope. Through various tests, it is concluded that MPCM has good thermal stability and thermo-regulating properties, making it suitable for bio-based insulation materials.
ENERGY AND BUILDINGS
(2023)
Article
Construction & Building Technology
Fedaa Abd-Alhamid, Michael Kent, John Calautit, Yupeng Wu
BUILDING AND ENVIRONMENT
(2020)
Review
Environmental Sciences
Othman Alnajdi, Yupeng Wu, John Kaiser Calautit
Article
Construction & Building Technology
Jan-F Flor, Marina Aburas, Fedaa Abd-AlHamid, Yupeng Wu
Summary: This study investigated the user acceptance of different types of ETFE cushions in retrofitting office buildings through virtual reality technology. Results showed that users prefer clear ETFE in double-skin facades, while fritted and switchable ETFE received lower satisfaction. Overall, view clarity is a key factor in user acceptance of DSF facades.
ENERGY AND BUILDINGS
(2021)
Article
Energy & Fuels
Xiao Liu, Yupeng Wu
Summary: The study designed and investigated a Building Integrated Photovoltaic (BIPV) smart window system consisting of a thermotropic membrane synthesised using HPC and gellan gum gelling agent for electricity generation and solar control. An optical model was developed to characterise the thermotropic membrane and was used to design and optimise the proposed BIPV smart window, evaluating the effects of HPC concentration, geometric concentration ratio, membrane thickness and glass refractive index on PV power outputs. Experimental tests showed a significant decrease in transmittance with increased membrane temperature, and the prototype BIPV smart window demonstrated higher short-circuit current compared to a similar system without the thermotropic membrane.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2021)
Article
Construction & Building Technology
Yanyi Sun, Robin Wilson, Hao Liu, Yupeng Wu
Summary: Smart window designs incorporating thermotropic and Transparent Insulation Material (TIM) can improve building energy efficiency and achieve homogeneous daylight distribution. The geometric configurations and thermotropic features play a significant role in energy and daylight performance.
BUILDING AND ENVIRONMENT
(2021)
Article
Construction & Building Technology
Xiao Liu, Yupeng Wu
Summary: This study proposed a versatile window called Building Integrated Photovoltaic (BIPV) smart window, which combines an optically switchable thermotropic layer, photovoltaic cells, and different types of glass covers to improve daylighting control, on-site electricity generation, and building energy efficiency. Numerical simulations showed that installing the BIPV smart window in a south-oriented office can achieve significant annual energy savings and provide a more comfortable indoor luminous environment.
BUILDING AND ENVIRONMENT
(2022)
Review
Construction & Building Technology
Fedaa Abd-Alhamid, Michael Kent, Yupeng Wu
Summary: This paper systematically reviews studies on view perception and discusses the factors affecting view perception, as well as the impact of views on other visual and non-visual perceptions. The paper also critically reviews methods used to visually represent views and quantify view perception. An all-inclusive approach to quantify view quality is proposed.
BUILDING AND ENVIRONMENT
(2023)
Article
Materials Science, Ceramics
Guang Yang, Yongwei Liu, Chuanfan Yang, Fang Xia, Daming Hu, Yupeng Wu, Yaroslav Shpotyuk, Viktor Takats, Xiaoyan He
Summary: NIR-shielding window materials were made by embedding Ta0.3W0.7O2.85 nanocrystals in borosilicate glass-ceramics through a simple melt-quenching process. The concentration of H2WO4 and Ta2O5 in the starting materials can be adjusted to control the optical and thermal performance of the windows. The optimized window with 4.5 mol% H2WO4 and 0.3 mol% Ta2O5 exhibited high visible light transmittance (74.4%) and strong NIR-shielding ability (T=68.9%). Its thermal insulation performance is superior to soda lime glass or ITO glass, and its visible light transmission is higher than cesium-tungsten-bronze-based film coated glass. The NIR-shielding property is attributed to local surface plasmon resonance caused by oxygen vacancies in the Ta0.3W0.7O2.85 nanocrystals. This study provides a method for fabricating energy-saving windows with tunable NIR-shielding performance.
CERAMICS INTERNATIONAL
(2023)
Article
Energy & Fuels
Xianghai Xing, Wei Lu, Guanhua Zhang, Yupeng Wu, Yanping Du, Zhibo Xiong, Li Wang, Kun Du, Hao Wang
Summary: In this study, a novel composite phase change material (PCM) consisting of a mixed solution of inorganic salt and organic salt was developed and characterized. Different weight percentages of sodium formate, potassium chloride, and water were evaluated to determine the optimal performance. The addition of xanthan gum and nano-TiO2 as gelling and nucleating agents, respectively, effectively improved the properties of the PCM by preventing phase separation, leakage, and reducing supercooling. The tested PCM showed excellent suitability for frozen food storage and transportation.
Article
Energy & Fuels
Xin Liu, Fangming Yang, Mengbin Li, Chenggong Sun, Yupeng Wu
Summary: This study presents a facile and scalable synthesis method for PCM-carbon foam composites using polyisocyanurate (PIR) foam derived carbon foam as a porous support. The carbon foam materials with a unique 3D molecular configuration exhibit high PCM loading capacity and excellent energy storage performance. The results provide a potential pathway for recycling PIR foams and producing cost-effective thermal energy storage materials.
Article
Energy & Fuels
Xin Liu, Haomin Wang, Xiao Liu, Fangming Yang, Li Guan, Suleiman Sani, Chenggong Sun, Yupeng Wu
Summary: In this study, novel salt composites were prepared using different mesoporous silica as the porous matrices and MgSO4 via impregnation method. The results showed that the MgSO4 loading level and textural properties of the porous matrices played a critical role in determining the water adsorption performance of the salt composites. The salt composites prepared with mesostructured cellular foam (MCF) exhibited excellent water adsorption capacity and hydration/dehydration rate, indicating their potential as promising candidates for low temperature energy storage.
Article
Construction & Building Technology
Dingming Liu, Mark Janos Kovacs-Biro, Karen Connelly, Fedaa Abd-AlHamid, Yupeng Wu
Summary: Daylighting enhances mood and visual comfort, but the design of glazed windows poses challenges for building designers. Coloured glazing, including chromatic glazing with unidirectional shifts in light color, affects human performance. This project explores the use of patterned chromatic glazing to distort color and improve the indoor luminous environment.
BUILDING AND ENVIRONMENT
(2023)
Article
Materials Science, Ceramics
Guang Yang, Yongwei Liu, Chuanfan Yang, Fang Xia, Yupeng Wu, Yaroslav Shpotyuk, Viktor Takats, Huidan Zeng, Yinsheng Xu, Hongfei Chen, Yanfeng Gao
Summary: This study investigates the influence of NaF concentration on the formation of near-infrared (NIR)-shielding functional units in glass windows. The results show that an optimal level of NaF concentration can enhance the NIR-shielding performance, while excessive NaF inhibits the formation of the functional units. By adjusting the NaF concentration and adding a small amount of H2WO4 as the tungsten source, glass with excellent optical and thermal insulation properties can be produced.
CERAMICS INTERNATIONAL
(2023)
Article
Thermodynamics
Haomin Wang, Xin Liu, Xiao Liu, Chenggong Sun, Yupeng Wu
Summary: This study used commercially available mesoporous silica as a porous matrix to prepare salt composites containing different salts. The physicochemical properties and water hydration/dehydration performance of the composites were characterized. The results showed that the salt loading level and type of salt played critical roles in determining the water adsorption performance of the composites, and most of the composites were capable of storing low-grade heat effectively.
Article
Construction & Building Technology
Fedaa Abd-Alhamid, Michael Kent, Yupeng Wu
Summary: This study examines the impact of window views on the psychological and physiological comfort and wellbeing of building occupants. The results show that increasing the size of the window leads to higher view perception evaluations, improved stress recovery, and positive psychological affect. Differences in window layout were also found, but only for a 10% window-wall ratio.
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.