Article
Thermodynamics
Muslizainun Mustapha, Ahmad Fudholi, Nurul Syakirah Nazri, Muhammad Ibrahim Ali Zaini, Nurul Nazli Rosli, Wan Mustafa Wan Sulong, Kamaruzzaman Sopian
Summary: This research examines the feasibility of using bifacial photovoltaic panels and V-groove mirror reflector lenses to improve the electrical efficiency of PVT solar collectors. The experimental results show that as the mass flow rate increases, the temperature differential and PV panel temperature decrease, leading to an increase in overall energy efficiency. The highest energy efficiency obtained in this study is 59.24%. This research contributes to the development of PVT collector system technology by demonstrating the feasibility of integrating bifacial PV and reflector lenses on PVT solar collectors.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Computer Science, Information Systems
Muthanna Mohammed Awad, Omer Khalil Ahmed, Obed Majeed Ali, Naseer T. Alwan, Salam J. Yaqoob, Anand Nayyar, Mohamed Abouhawwash, Adel Fahad Alrasheedi
Summary: The aim of this study was to review and analyze previous research on cooling techniques for thermal photovoltaic (PV) systems using phase-change materials. The findings showed that by combining phase-change materials with fins and nanoscale fluids, the thermal, electrical, and overall efficiency of the system can be significantly improved. The addition of nanomaterials enhances the specific heat capacity and thermal conductivity of the phase-change materials, resulting in lower plate temperature and higher electrical efficiency.
Article
Construction & Building Technology
Marie Rugholm Krusaa, Ida Orduk Hoffmann, Christian Anker Hviid
Summary: This paper experimentally investigates the cooling performance of a concept where a radiant ceiling is suspended from a hollow-core concrete slab and ventilation air is distributed without ducts and air terminals. The results show that the concept performs well in terms of thermal comfort and draught, and offers streamlined installation procedures.
ENERGY AND BUILDINGS
(2022)
Article
Thermodynamics
Wenye Lin, Zhenjun Ma, Shugang Wang, M. Imroz Sohel, Ermanno Lo Cascio
Summary: This paper presents an experimental investigation of an air-based solar photovoltaic thermal (PVT) collector coupled with a centralised phase change material (PCM) thermal energy storage (TES) system, and the development of a model-based strategy to facilitate optimisation of the PVT-PCM systems. The experiments revealed the deficiencies of PVT-PCM systems and the optimal design for improving system efficiency and latent heat utilization ratio.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Abdulsahib M. Bassam, Kamaruzzaman Sopian, Adnan Ibrahim, Mohd Faizal Fauzan, Anwer B. Al-Aasam, Ghaith Yahay Abusaibaa
Summary: The efficiency of a photovoltaic cell decreases as temperature rises. A hybrid PVT system using a cooling nanofluid circulation system with a micro fin tube encapsulated with nano PCM was studied to increase efficiency.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Construction & Building Technology
Bin Yang, Yuyao Guo, Shuaixing Xu, Wei Su, Mengchun Wu, Faming Wang
Summary: This study investigated the influence of different porous ceiling opening rates on the flow field distribution and human thermal comfort in a radiant heating room through numerical simulations and subjective experiments. The results showed that non-uniform opening on the porous ceiling can optimize the thermal environment and reduce airflow discomfort, while adjusting the ceiling opening rates can maintain the neutral level in the room.
BUILDING AND ENVIRONMENT
(2022)
Article
Construction & Building Technology
Marie Rugholm Krusaa, Christian Anker Hviid
Summary: The paper presents a novel comfort system, HVACeiling, that combines full radiant ceilings with diffuse ventilation, demonstrating improved heat exchange efficiency and thermal comfort through numerical studies.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Thermodynamics
Yu Jin Kim, Kibong Kim, Euy Joon Lee, Eun Chul Kang
Summary: The dissemination of PVT technology in urban areas is challenging due to limited space caused by high population concentration. To address this issue, new technological advancements are needed to create more space for PVT technology deployment. Previous numerical studies on PVT have focused on validation tests to ensure reliable results, but these tests have not met international criteria such as ISO 9806. Therefore, it is necessary to conduct validation tests for numerical studies that align with international thermal performance test methods and criteria. This study presents the development of a soundproof PVT module that can be easily installed along roads and railroads to mitigate noise pollution and promote the adoption of PVT facilities in urban areas. Additionally, validation tests and numerical simulations were conducted to evaluate the thermal performance of the module and optimize its design.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Thermodynamics
Muhammad Amir Aziat Bin Ishak, Adnan Ibrahim, Mohd Faizal Fauzan, Ahmad Fazlizan, Win Eng Ewe, Hussein A. Kazem
Summary: This study evaluated the energy performance of a bifacial PVT solar collector cooled by reversed circular flow jet impingement. The results showed that different packing factors significantly affected the photovoltaic efficiency, with higher packing factors resulting in higher photovoltaic and thermal efficiencies.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Muhammad Amir Aziat Bin Ishak, Adnan Ibrahim, Ahmad Fazlizan, Mohd Faizal Fauzan, Kamaruzzaman Sopian, Aqil Afham Rahmat
Summary: A reversed circular flow jet impingement (RCFJI) was used as a cooling mechanism for a bifacial photovoltaic thermal (PVT) solar collector, and the exergy efficiency of this system was analyzed. The experimental results showed that under a solar irradiance of 900W/m2 and a mass flow rate of 0.14kg/s, the highest photovoltaic exergy and thermal exergy achieved were 47.2W and 9.67W, respectively. The exergy efficiency reached a maximum value of 12.64% under the solar irradiance of 900W/m2, with the optimal operational mass flow rate determined as 0.06kg/s.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Abdulsahib M. Bassam, Kamaruzzaman Sopian, Adnan Ibrahim, Anwer B. Al-Aasam, Mojtaba Dayer
Summary: A hybrid PVT nanofluid circulation system was tested, using a micro-fin tube and twisted tape with nano phase change material. The use of nanoparticles improved the thermal conductivity and performance of the nanofluid and nano PCM. Experiments were conducted in a controlled environment with a solar simulator, using water/SiC nanofluid as the working fluid. The system showed improved electrical and thermal efficiencies, with a maximum thermal efficacy of 83.3%.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Construction & Building Technology
Pei Peng, Michal Pomianowski, Chen Zhang, Rui Guo, Rasmus Lund Jensen, Kim Trangbaek Jonsson, Guangcai Gong
Summary: The study investigates the performance of diffuse ceiling ventilation (DCV) in heating mode through fullscale chamber experiments. It shows that increased air change rates can improve indoor air quality, while having little impact on ventilation effectiveness. The intensity of internal heat sources and the type of contaminant sources strongly influence DCV's ventilation effectiveness, with the effect of exhaust positions depending on the presence of internal heat sources.
BUILDING AND ENVIRONMENT
(2021)
Article
Engineering, Chemical
Milad Tahmasbi, Majid Siavashi, Amir Mohammad Norouzi, Mohammad Hossein Doranehgard
Summary: This study investigates the use of porous metal foams to enhance the thermal and energy efficiencies of photovoltaic-thermal collectors. Results show that the utilization of porous media can improve the system efficiencies, but at the cost of increased pressure drop.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2021)
Article
Energy & Fuels
Anmol Gupta, Sanjay Agrawal, Yash Pal
Summary: The performance analysis of the PV-TE-SWC system has been conducted and compared with a PV-TE air collector. The results show that the PV-TE-SWC system has significant advantages in terms of overall electrical efficiency and environmental energy gains, indicating its great potential for energy saving and emission reduction.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Review
Environmental Sciences
Sriram Surya Kirampadi Sankar, Anish Murugan, Abdur Rahman, Mohamed Illyas, Rajendran Duraisamy Ramalingam, Fausto Pedro Garcia Marquez, Muthu Manokar Athikesavan
Summary: Solar energy has emerged as a promising renewable energy source to replace current energy market. Flat plate solar collectors (FPSC) are easy to produce and cost-effective, leading to extensive research to improve its efficiency and reliability. This article analyzes recent improvements in FPSC technology, with focus on achieved efficiencies and temperatures, aiming to provide valuable insights into the advancements in FPSC and their potential for solar energy utilization.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Energy & Fuels
Xinlei Zhou, Wenye Lin, Ritunesh Kumar, Ping Cui, Zhenjun Ma
Summary: This paper presents a new strategy that integrates LSTM models and RL agents to forecast building electricity consumption. Results show that the proposed strategy can significantly improve prediction accuracy for buildings with large monthly variations in electricity consumption, while showing less improvement for those with insignificant variations.
Article
Construction & Building Technology
Haiguo Yin, Daina Ji, Yuanyuan Wang, Yaokun Huo, Xin Deng, Jiali Wang, Zhenjun Ma, Angui Li
Summary: Column attachment ventilation mode (CAV) is a new form of air distribution that utilizes the Coanda effect to efficiently transport air from the top of a room to the lower occupied zone. This study investigated the movement and diffusion characteristics of particulate matter (PM) in CAV mode. The results showed that particles of different sizes had different behaviors, and the air supply temperature difference had a significant impact on PM distribution.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Energy & Fuels
Shengqi Zhang, Liang Pu, Simone Mancin, Zhenjun Ma, Lingling Xu
Summary: This study investigates the effects of material types, structural parameters, and heating configurations on the melting front, heat transfer characteristics, and temperature distribution of metal foam/paraffin composite phase change materials (PCMs) in large cavities. The results provide insights into the heat transfer mechanisms during the melting process and a correlation to model the melting process of the composite PCMs.
Article
Energy & Fuels
Haoshan Ren, Zhenjun Ma, Chung Fai Norman Tse, Yongjun Sun
Summary: Developing solar-powered electric bus networks can help address energy and environmental challenges in high-density cities. However, the mismatch between PV power generation and bus charging demand presents a charging control issue. This study proposes a control strategy to improve renewable energy consumption and reduce grid dependence in solar-powered electric bus networks.
Article
Green & Sustainable Science & Technology
Saboor Shaik, Chelliah Arumugam, Sharmas Vali Shaik, Muslum Arici, Asif Afzal, Zhenjun Ma
Summary: The global energy demand in the building sector has increased, with air conditioning being a major consumer. Net-zero or green buildings are crucial for a sustainable future. This study investigates the cost-saving potential of using phase change materials (PCMs) in a duplex house, and finds that the best results are obtained with the outer side PCM layer brick with OM29 PCM.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Thermodynamics
Haoshan Ren, Zhenjun Ma, Antoni B. Chan, Yongjun Sun
Summary: This study proposes an optimal planning strategy for distributed rooftop PV systems in high-density cities. By using high-accuracy solar energy potentials and integer learning programming, the strategy effectively identifies suitable rooftops for PV installations, maximizing performance and cost-efficiency.
Article
Construction & Building Technology
Wenye Lin, Alan Green, Laia Ledo Gomis, Georgios Kokogiannakis, Paul Cooper
Summary: This paper presents a numerical investigation of dew formation on building roofs and its impact on thermal and energy performance. A new semi-analytical model was developed to evaluate the effects of rooftop dew. Case study simulations showed that dew significantly influenced predictions of benefits and penalties of a 'cool roof'. Neglecting dew effects resulted in overestimating electricity savings and gas heating penalties associated with a cool roof. The study highlights the importance of considering dew's thermal effects in building performance simulations and provides a simple model to include these effects.
ENERGY AND BUILDINGS
(2023)
Article
Construction & Building Technology
Georgios Kokogiannakis, Daniel Daly, Clayton McDowell, James Roth, Michael Tibbs, Paul Cooper
Summary: This study compares the energy use of an in-slab gas hydronic heating system and a newly installed split system air conditioner in thermodynamically-equivalent classrooms during unoccupied and occupied periods. A preliminary comparison also quantifies the heating penalty for the gas-fuelled hydronic heating system when windows remain open against the energy needed for heating in a control classroom with windows closed. The results show that the split system air conditioner uses significantly less energy than the gas hydronic system, especially when the system is operated for long periods.
ENERGY AND BUILDINGS
(2023)
Article
Thermodynamics
Linfeng Liang, Haiguo Yin, Da Zhang, Yuekun Han, Yanyan Li, Jingying Zhang, Yongshou Zhang, Zhenjun Ma, Angui Li
Summary: This study investigates the intrusion of outdoor pollutants into sentry buildings and compares the isolation effects of internal circulation with double-attached ventilation (IC-DAV) and external circulation with double-attached ventilation (EC-DAV) modes with natural ventilation. Computational fluid dynamics simulations were used to analyze the transportation and distribution of pollutants under different wind directions, velocities, and ventilation modes. The results show that both IC-DAV and EC-DAV modes can effectively isolate outdoor pollutants, with EC-DAV mode demonstrating better performance.
BUILDING SIMULATION
(2023)
Article
Energy & Fuels
Muhammad Bilal Awan, Zhenjun Ma, Wenye Lin, A. K. Pandey, V. V. Tyagi
Summary: This paper presents a methodological approach using the weighted product method (WPM) and analytical hierarchy process (AHP) to rank and select phase change materials (PCMs) for thermal energy storage in building applications. Two case studies were conducted to test and evaluate the effectiveness of this approach, and the results demonstrated its validity.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
Zhihua Wang, Guichen Li, Yujia Zhang, Fenghao Wang, Xin Jiang, Zhenjun Ma
Summary: In this study, a novel biomimetic honeycomb fractal heat exchanger is proposed for high heat transfer efficiency and increased structural stability in gas coolers. The conjugate heat transfer between supercritical CO2 and water is investigated numerically. The results show that the heat transfer coefficients of CO2 vary significantly in different flow channels and locations, especially near the supercritical region. A new correlation for supercritical CO2 is developed based on thermophysical parameters, buoyancy, and hydraulic diameter.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Review
Energy & Fuels
Sudhir Kumar Pathak, V. V. Tyagi, K. Chopra, B. Kalidasan, A. K. Pandey, Varun Goel, Abhishek Saxena, Zhenjun Ma
Summary: Solar air heating is widely used for crop drying, building and space heating due to its maturity and economic viability. The fluctuating nature of solar energy and the lack of energy storage units have limited the performance of solar air heaters (SAHs). Phase change materials (PCMs) have been employed to store solar energy and enhance the effectiveness of SAHs during non-sunshine hours. This review article presents recent studies on the analysis of various SAH systems integrated with and without PCMs, focusing on energy, exergy, exergoeconomic, and envir-oeconomic aspects.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Materials Science, Multidisciplinary
Chuan Sun, Yuancheng Geng, Adam Glowacz, Maciej Sulowicz, Zhenjun Ma, Patrick Siarry, Munish Kumar Gupta, Z. Li
Summary: This study investigated the impact of a magnetic field on the heat transfer of Fe3O4 ferrofluid swirl flow. The results showed that applying the magnetic field at different locations improved the convective heat transfer coefficient and reduced the absorber tube temperature, but increased the pressure drop over the tube.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Engineering, Multidisciplinary
Xinhua Liu, Peng Qi, Patrick Siarry, Dezheng Hua, Zhenjun Ma, Xiaoqiang Guo, Orest Kochan, Z. Li
Summary: This paper proposes an improved multiscale neural network method for face recognition in underground coal mining to address the issues of overstaffing and incomplete information. Experimental results show that the proposed method can accurately recognize miners in harsh environments.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Construction & Building Technology
Yujia Zhang, Zhihua Wang, Pengfei Zhang, Xin Jiang, Fenghao Wang, Chao Huan, Zhenjun Ma
Summary: This paper investigates the exergy analysis of a transcritical CO2 air-source heat pump system with a novel honeycomb gas cooler. By establishing the exergy model of each component in the heat pump system and analyzing the irreversible losses, the energy utilization of the system is evaluated. The results show that there is significant room for improvement in the system's energy efficiency, with the compressor, throttle valve, and evaporator being the main contributors to irreversible losses.
Article
Thermodynamics
Pengcheng Zhao, Jingang Wang, Liming Sun, Yun Li, Haiting Xia, Wei He
Summary: The production of green hydrogen through water electrolysis is crucial for renewable energy utilization and decarbonization. This research explores the optimal electrode configuration and system design of compactly-assembled industrial electrolyzer. The findings provide valuable insights for industrial application of water electrolysis equipment.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
V. Baiju, P. Abhishek, S. Harikrishnan
Summary: Thermally driven adsorption desalination systems (ADS) have gained attention as an eco-friendly solution for water scarcity. However, they face challenges related to low water productivity and scalability. To overcome these challenges, integrating ADS with other desalination technologies can create a small-scale hybrid system. This study proposes integrating ADS with a Thermo Electric Dehumidification (TED) unit to enhance its performance.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
C. X. He, Y. H. Liu, X. Y. Huang, S. B. Wan, Q. Chen, J. Sun, T. S. Zhao
Summary: A decentralized centroid multi-path RC network model is constructed to improve the temperature prediction accuracy compared to traditional RC models. By incorporating multiple heat flow paths and decentralizing thermal capacity, a more accurate prediction is achieved.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Chaoying Li, Meng Wang, Nana Li, Di Gu, Chao Yan, Dandan Yuan, Hong Jiang, Baohui Wang, Xirui Wang
Summary: There is an urgent need to shift away from heavy dependence on fossil fuels and embrace renewable energy sources, particularly in the energy-intensive oil refining process. This study presents an innovative concept called the Solar Oil Refinery, which applies solar energy in oil refining. A solar multi-energies-driven hybrid chemical oil refining system that utilizes solar pyrolysis and electrolysis has been developed, significantly improving solar utilization efficiency, cracking rate, and hydrogen yield.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Chao Ma, Guanghui Wang, Dingbiao Wang, Xu Peng, Yushen Yang, Xinxin Liu, Chongrui Yang, Jiaheng Chen
Summary: This study proposes a bio-inspired fish-tail wind rotor to improve the wind power efficiency of the traditional Savonius rotor. Through transient simulations and orthogonal experiments, the key factors affecting the performance are identified. A response surface model is constructed to optimize the power coefficient, resulting in an improvement of 9.4% and 6.6% compared to the Savonius rotor.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Sina Bahmanziari, Abbas-Ali Zamani
Summary: This paper proposes a new framework for improving electrical energy harvesting from piezoelectric smart tiles through a combination of magnetic plucking, mechanical impact, and mechanical vibration force mechanisms. Experimental results demonstrate a significant increase in energy yield and average energy harvesting time compared to other mechanisms.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Nanjiang Dong, Tao Zhang, Rui Wang
Summary: This study establishes a multiobjective mixed-variable configuration optimization model for a comprehensive combined cooling, heating, and power energy system, and proposes an efficient generating operator to optimize this model. The experimental results show that the proposed algorithm performs better than other state-of-the-art algorithms.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Ahmed E. Mansy, Eman A. El Desouky, Tarek H. Taha, M. A. Abu-Saied, Hamada El-Gendi, Ranya A. Amer, Zhen-Yu Tian
Summary: This study aims to convert office paper waste into bioethanol through a sustainable pathway. The results show that physiochemical and enzymatic hydrolysis of the waste can yield a high glucose concentration. The optimal conditions were determined using the Box-Behnken design, and a blended membrane was used for ethanol purification.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Sven Klute, Marcus Budt, Mathias van Beek, Christian Doetsch
Summary: Heat pumps are crucial for decarbonizing heat supply, and steam generating heat pumps have the potential to decarbonize the industrial sector. This paper presents the current state, technical and economic data, and modeling principles of steam generating heat pumps.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Le Zhang, To-Hung Tsui, Yen Wah Tong, Pruk Aggarangsi, Ronghou Liu
Summary: This study investigates the effectiveness of a current-carrying-coil-based magnetic field in promoting anaerobic digestion of chicken manure. The results show that the applied magnetic field increases methane yield, decreases carbon dioxide production, and reduces the concentration of ammonia nitrogen. Microbial community analysis reveals the enrichment of certain methanogenic genera and enhanced metabolic pathways. Pilot-scale experiments confirm the technical effectiveness of the magnetic field assistance in enhancing anaerobic digestion of chicken manure.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Bo Chen, Ruiqing Ma, Yang Zhou, Rui Ma, Wentao Jiang, Fan Yang
Summary: This paper presents an advanced energy management strategy for fuel cell hybrid electric heavy-duty vehicles, focusing on speed planning and energy allocation. By utilizing predictive co-optimization control, this strategy ensures safe inter-vehicle distance and minimizes energy demand. Simulation results demonstrate the effectiveness of the proposed method in reducing fuel cell degradation cost and overall operation cost.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Fabio Fatigati, Roberto Cipollone
Summary: Organic Rankine Cycle-based microcogeneration systems that use solar sources to generate electricity and hot water can help reduce CO2 emissions in residential energy-intensive sectors. The adoption of a recuperative heat exchanger in these systems improves efficiency, reduces thermal power requirements, and saves on electricity costs.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Lipeng He, Renwen Liu, Xuejin Liu, Xiaotian Zheng, Limin Zhang, Jieqiong Lin
Summary: This research proposes a piezoelectric-electromagnetic hybrid energy harvester (PEHEH) for low-frequency wave motion and self-sensing wave environment monitoring. The PEHEH shows promising power output and the ability to self-power and self-sense the wave environment.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Shangling Chu, Yang Liu, Zipeng Xu, Heng Zhang, Haiping Chen, Dan Gao
Summary: This paper studies a distributed energy system integrated with solar and natural gas, analyzes the impact of different parameters on its energy utilization and emissions reduction, and obtains the optimal solution through an optimization algorithm. The results show that compared to traditional separation production systems, this integrated system achieves higher energy utilization and greater reduction in carbon emissions.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Qingpu Li, Yaqi Ding, Guangming Chen, Yongmei Xuan, Neng Gao, Nian Li, Xinyue Hao
Summary: This paper proposes and studies a piston-type thermally-driven pump with a structure similar to a linear compressor, aiming to eliminate the high-quality energy consumption of existing pumps and replace mechanical pumps. The coupling mechanism of working fluid flow and element dimension is analyzed based on force analysis, and experimental data analysis is used to determine the pump operation stroke. Theoretical simulation is conducted to analyze the correlation mechanism of the piston assembly. The research shows that the thermally-driven pump can greatly reduce power consumption and has potential for industrial applications.
ENERGY CONVERSION AND MANAGEMENT
(2024)
