Article
Construction & Building Technology
Yongqiang Luo, De'en Cui, Nan Cheng, Shicong Zhang, Xiaosong Su, Xi Chen, Zhiyong Tian, Jie Deng, Jianhua Fan
Summary: This study introduces a new concept of an active building envelope system that can control heat gain/loss, potentially reducing the need for conventional air conditioner systems. The research explores the optimal thermal load settings for different combinations of photovoltaic, thermoelectric modules, energy storage, and control algorithms.
BUILDING AND ENVIRONMENT
(2022)
Article
Construction & Building Technology
Mohammad Jalalizadeh, Rima Fayaz, Shahram Delfani, Hassan Jafari Mosleh, Maryam Karami
Summary: A new trigeneration system combining glazed building integrated photovoltaic-thermal collectors and an absorption cooling system is proposed to meet the thermal and electrical energy demands of a residential building in this study. Dynamic simulation and model development show that the system can significantly reduce building energy consumption.
JOURNAL OF BUILDING ENGINEERING
(2021)
Review
Energy & Fuels
Jiashu Kong, Yitong Dong, Aravind Poshnath, Behzad Rismanchi, Pow-Seng Yap
Summary: This paper provides a detailed assessment of building integrated photovoltaic (BIPV) technology in net-zero energy buildings (NZEBs), emphasizing the importance of factors such as building surface area to volume ratio, window-wall ratio, and solar heating gain coefficient. The study concludes that NZEBs use renewable energy for energy efficiency and carbon neutrality, but face limitations such as neglecting indoor conditions, thermal comfort, and a lack of energy supply monitoring. Combining BIPV with building integrated solar thermal can enhance outcomes, and BIPV designs should follow standards and learn from successful cases, while long-term reliability and structural integrity studies are imperative.
Article
Green & Sustainable Science & Technology
Hooman Azad Gilani, Siamak Hoseinzadeh, Hirou Karimi, Ako Karimi, Amir Hassanzadeh, Davide Astiaso Garcia
Summary: Cyprus heavily relies on energy imports and improving energy efficiency as well as implementing renewable energy systems could greatly benefit the country's energy situation. This study investigated the integration of a variable refrigerant flow heat pump system with PV technology in a residential building in Cyprus, showing that PV arrays can satisfy a significant portion of the energy demand and are economically feasible for installation in different locations.
Article
Thermodynamics
Yulong Zhao, Siyuan Gong, Caihong Zhang, Minghui Ge, Liyao Xie
Summary: This study investigates the application of spray cooling to photovoltaic cells and establishes a mathematical model for solar photovoltaic power generation systems. The results show that spray cooling has significant advantages over water cooling at large concentration ratios, and there exists an optimal spray flow rate that maximizes net electrical efficiency. Additionally, a decrease in spray fluid temperature can significantly improve the system's output power.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Construction & Building Technology
Sepehr Foroushani, Rob Bernhardt, Mark Bernhardt
Summary: Achieving net-zero energy levels of operational efficiency is crucial for decarbonizing the building sector at a large scale. The Passive House energy performance level is gaining global consensus as a net-zero energy ready standard. However, the North American Reference Building Approach (RBA) used to assess building energy performance has significant flaws, including the inability to deliver net-zero energy performance and the promotion of inefficient designs and poor energy modeling practices.
ENERGY AND BUILDINGS
(2022)
Article
Thermodynamics
Mahdi Deymi-Dashtebayaz, Andrey Nikitin, Vajihe Davoodi, Veronika Nikitina, Maziyar Hekmatshoar, Vladislav Shein
Summary: The study proposes and analyzes a multi-generation system to meet the heating, electricity, and water demands of a building in St. Petersburg, Russia. The system utilizes solar energy, hydrogen energy storage system (HESS), and multi-effect desalination (MED). The analysis shows that the system can satisfy a significant portion of the building's electricity and heat demands without auxiliary systems, while also providing the required freshwater. The energy and exergy efficiencies of the integrated system are determined to be 20% and 7%, respectively. Economic analysis indicates that the proposed system becomes financially viable after 9 years at a 3% interest rate.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Chemistry, Multidisciplinary
Jaqueline Litardo, Massimo Palme, Ruben Hidalgo-Leon, Fernando Amoroso, Guillermo Soriano
Summary: Through building simulations and energy generation data, the study found that in the tropical climate of Guayaquil, incorporating daylighting controls can achieve a 20% reduction in total building energy consumption, followed by a combination of triple low-e coating glazing and active measures for 35% and 43% savings in total building energy consumption and cooling loads.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Physical
Ehsan Baniasadi, Masoud Ziaei-Rad, Mohammad Amin Behvand, Nader Javani
Summary: This study presents an analysis of energy, exergy and exergy-economic of a novel system to meet the energy and water demands of a residential building. The system uses solar and geothermal energies and consists of various components such as electrolyser, fuel cell, photovoltaic system, and a desalination system. The results show high energy and exergy efficiencies in cooling and heating modes, with the photovoltaics and organic Rankine cycle contributing to the largest exergy destruction.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Thermodynamics
Yongqiang Luo, Nan Cheng, Shicong Zhang, Zhiyong Tian, Guozhi Xu, Xinyan Yang, Jianhua Fan
Summary: To achieve net zero energy building, this study proposes new building envelope systems that integrate renewable energy and novel design. These systems can reduce thermal load while providing additional cooling/heating supply, promoting the advancement of net zero energy buildings.
BUILDING SIMULATION
(2022)
Article
Energy & Fuels
Haoshan Ren, Yongjun Sun, Ahmed K. Albdoor, V. V. Tyagi, A. K. Pandey, Zhenjun Ma
Summary: This study investigates the energy flexibility of a net-zero energy house using solar-assisted air conditioning system, thermal energy storage, and demand-side management strategies. Results showed that using DSM strategies and TES unit can significantly increase solar contribution and improve energy efficiency.
Article
Green & Sustainable Science & Technology
Khalid Almutairi, Pasura Aungkulanon, Salem Algarni, Talal Alqahtani, Seitkazy A. Keshuov
Summary: This study investigates the feasibility of implementing zero energy buildings in Muscat, Sultanate of Oman. Climate maps were created using raw climatic data from meteorological stations in the region, and surfaces with the highest solar energy were chosen. Special design elements such as thermal insulation and canopy were considered, and the number of solar panels needed was calculated. The modeling shows that installing PV panels as canopies can compensate for the energy shortage.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Energy & Fuels
Jonas Manuel Gremmelspacher, Rafael Campama Pizarro, Matthijs van Jaarsveld, Henrik Davidsson, Dennis Johansson
Summary: The study explores the potential of retrofitting historical buildings in Northern countries into Net Zero Energy Buildings (NetZEB) using a 150-year old castle in Helsingborg, Sweden as a case study. By optimizing the PV system, the castle was able to achieve NetZEB standards, with landscape integrated PV system proving to be a feasible alternative.
Article
Thermodynamics
Clinton Thai, Jack Brouwer
Summary: This study investigates the challenges of incorporating the technical potential of photovoltaic power generation into an existing university microgrid system in order to achieve complete decarbonization. Three energy storage integration pathways are established: battery energy storage systems (BESS) for daily energy shifting, hydrogen production for conversion in a gas turbine power plant (P2G-GT), and hydrogen production for conversion in a fuel cell system (P2G-FC). Installing maximum solar PV capacity meets 20% of the electric load, but 58% of PV production is curtailed without energy storage. BESS and P2G-FC strategies both result in a high 64% renewable energy supply. BESS is better for continuous runtimes of a day or less, while the hydrogen storage plus fuel cell option is better for one to three days of continuous power. To fully decarbonize the microgrid, a significant portion of the renewable energy supply must come from procured biogas or off-campus resources.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Construction & Building Technology
Hossein Omrany, Ruidong Chang, Veronica Soebarto, Yanquan Zhang, Amirhosein Ghaffarianhoseini, Jian Zuo
Summary: This study provides a comprehensive overview of research developments in the field of Net-Zero Energy Buildings (NZEBs) over the past three decades using bibliometric analysis techniques. The study identifies influential researchers, sources, and countries in the field, explores thematic research focus areas and hot topics, and analyzes the thematic evolution of NZEBs. The results indicate that the field has expanded from initial limited themes to encompassing more themes, but is still evolving with emerging themes. This study offers important insights into the research developments and emerging themes in the field of NZEBs.
ENERGY AND BUILDINGS
(2022)
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.