Article
Thermodynamics
Shiquan Shan, Binghong Chen, Zhijun Zhou
Summary: This study introduces a novel NFTPV-TE hybrid system and analyzes its performance through numerical simulation, investigating the impact of operating parameters on system efficiency. The results show that the NFTPV-TE hybrid system outperforms single NFTPV system, suitable for solar energy conversion but not for low-temperature waste heat recovery.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Thermodynamics
Ahmet Coskun, Harun Yalin, Ibrahim Atmaca
Summary: Heat recovery ventilation devices, such as plate cross-flow, rotary wheel, and sorption rotor, were analyzed for their performance in different climatic conditions. The study found that devices with only sensible heat transfer had useful heat recovery between 44.01 and 158.42 kW, while devices providing latent heat transfer had recovery between 51.34 and 773.25 kW. The outdoor temperature and humidity levels required for latent heat recovery were determined using orthogonal optimization.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Thermodynamics
Benzhi Hou, Yihua Zheng, Luyi Xing, Qinglu Song
Summary: The performance of thermoelectric heat pumps is enhanced by air recirculation and regenerative energy recovery. Experimental results show that the COP of the air recirculation TEHP is as high as about 3.7, and the COP with recirculation is 51-73% higher than without recirculation. The combination of regenerative heat recovery and air recirculation further improves the energy efficiency of the heat exchanger test system.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Jie Chen, Ruochen Wang, Ding Luo, Weiqi Zhou
Summary: In this study, a segmented converging thermoelectric generator is proposed and optimized, leading to a significant improvement in output power by making the temperature differences of thermoelectric modules in all segments approximately identical.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Tianjun Liao, Qijiao He, Qidong Xu, Yawen Dai, Chun Cheng, Meng Ni
Summary: The achievement of temperature and heat management by combining PV power generation and TERs is significant. A new energy system combining PV with TERs is proposed and theoretically evaluated. The study identifies optimal efficiency and operating conditions by analyzing electrical matching properties and the effects of solar irradiance.
Article
Thermodynamics
V Rednic, R. Gutt, E. Bruj, A. Bot
Summary: This paper presents a two-stage heat recovery system equipped with thermoelectric elements to extract thermal energy from the wasted heat of a Stirling engine. Through optimization and testing, it was found that 44% of the wasted flue energy can be recovered as useful thermal and electric energy, demonstrating the effectiveness of the system design.
APPLIED THERMAL ENGINEERING
(2021)
Review
Thermodynamics
Nicolae Vlad Burnete, Florin Mariasiu, Christopher Depcik, Istvan Barabas, Dan Moldovanu
Summary: With the growing emphasis on electrified vehicles, the use of internal combustion engines (ICEs) as the primary propulsion source is being challenged, necessitating improvements in efficiency and emissions. Recovering waste heat from the ICE can enhance overall thermal efficiency, and thermoelectric generators offer advantages such as environmental friendliness, reliability, and direct conversion of thermal energy into electrical energy. This study provides a comprehensive overview of the use of thermoelectric generators for waste heat recovery in ICEs, presenting experimental and simulation results on power output, efficiency gains, and fuel consumption reduction. It also summarizes the design considerations for the hot side heat exchanger.
PROGRESS IN ENERGY AND COMBUSTION SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Zhongxin Liang, Congcong Xu, Shaowei Song, Xin Shi, Wuyang Ren, Zhifeng Ren
Summary: Devices based on Bi2Te3 have been dominant in the thermoelectric cooling market, but their narrow operating temperature range and high cost limit their applications. The recently developed Mg3Sb2-based compounds offer excellent transport properties across a wide temperature range, low material costs, and non-toxicity. By regulating carrier concentration, carrier mobility, and lattice thermal conductivity, the thermoelectric performance of p-type Mg3Sb2 is significantly improved, allowing for the construction of a reliable and low-cost all-Mg3Sb2-based thermoelectric device.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Thermodynamics
Mostafa El-Shafie, M. Khalil Bassiouny, Shinji Kambara, Samy M. El-Behery, A. A. Hussien
Summary: The study focuses on utilizing waste heat from high-temperature flue gases to design a heat exchanger for optimal energy utilization and reduce natural gas consumption. Analyzing the thermodynamic properties of exhaust gases based on chemical composition and estimating the properties of solutions in the absorption chiller using heat and mass balance equations. The heat exchanger design specification was determined for different tube diameters using copper and steel materials, with a compact direct heat exchanger showing the best performance.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
S. Diaz de Garayo, A. Martinez, D. Astrain
Summary: This paper proposes a HVAC system that integrates a thermoelectric heat pump with a double flux ventilation system and a sensible heat recovery unit. The study investigates the energy performance and comfort conditions of the system in a passive house in Pamplona. The results show that the thermoelectric system maintains comfort conditions but consumes more electric energy compared to a vapor compression system.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
S. P. Aktershev, I. Mezentsev, N. N. Mezentseva
Summary: A two-dimensional mathematical model of a regenerative heat exchanger for a ventilation system with a periodic change in air flow direction has been developed. The energy efficiency of the heat exchanger is defined in terms of reducing thermal energy loss, with the potential to reduce energy losses by more than 90%. Parametric studies using numerical simulation reveal the influence of operating and design parameters on energy efficiency, identifying key parameters that strongly affect the system's efficiency and providing recommendations for optimization.
APPLIED THERMAL ENGINEERING
(2022)
Article
Chemistry, Analytical
Xiaodong Jia, Shifa Fan, Zhao Zhang, Hongbiao Wang
Summary: A vehicle aerodynamic heat energy recovery system based on thermoelectric generators (TEGs) is proposed, with a mathematical model established to describe the energy conversion law. The influences of flight conditions on the system's energy conversion behavior are investigated, showing that lower flight altitude and higher Mach number improve system performance, while longer leg lengths affect the temperature and heat absorption of TEGs.
Article
Thermodynamics
Qingshan Liu, Zhilong He, Yingwen Liu, Yaling He
Summary: The research focused on the coupled thermodynamic characteristics of a thermoelectric generator and a liquid air energy storage system, revealing significant impacts of hot water outlet temperature and discharging pressure on system performance. Optimization strategies were proposed to enhance system efficiency.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Thermodynamics
Zhengyan Zhao, Chenxuan Zhao, Lu Li, Dongxing Song, Tianci Wang, Zonhan Wei, Ke Wang
Summary: Reverse electrodialysis heat engine (REDHE) has great potential to harness low-grade heat produced in industrial processes and renewable energy utilization. This study builds a framework to simulate the power generation and regeneration units of REDHE, and divides the total efficiency of REDHE into the respective efficiencies of the units. Results indicate that the total efficiencies increase with the concentration of high concentration (HC) solution and the RED temperature, but show a non-monotonic trend with the initial concentration. The trade-off between the efficiencies of the two units is the key to achieving the highest total efficiency.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Energy & Fuels
Nicola Bianco, Andrea Fragnito, Marcello Iasiello, Gerardo Maria Mauro
Summary: This study applies multi-objective optimization based on a genetic algorithm to design a wall-type heat recovery and ventilation (HRV) unit equipped with a phase change material (PCM) to demonstrate its advantages in buildings. A thermo-fluid dynamic 3D model is developed to assess natural convection. Then, a 2D model is solved and validated using a commercial finite element code.
Article
Thermodynamics
Jiang-Tao Hu, Shuo-Jun Mei
Summary: Unsteady double diffusive convection under the influence of time-periodic sidewall temperature in a rectangular enclosure with a porous wall is studied both numerically and analytically. The heat and moisture transfer rates are found to be impacted by the periodic temperature variations, showing a sinusoidal variation with time, and a resonance phenomenon occurs when the convection effect is strong enough, leading to increased fluctuations. Good agreement is observed between the analytical and numerical results, offering insights into heat and moisture transfer rates and resonant frequencies in thermal storage systems.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Review
Construction & Building Technology
Shuo-Jun Mei, Chao Yuan
Summary: This study conducted a literature review on the buoyancy effects on outdoor natural ventilation in order to provide suggestions for improving simulation accuracy and support future validation studies. The study also explored correlations between air exchange velocity and non-dimensional parameters and emphasized the need for future research in strong buoyancy and weak wind conditions.
BUILDING AND ENVIRONMENT
(2022)
Article
Construction & Building Technology
Lei Xu, Shanshan Tong, Wenhui He, Wei Zhu, Shuojun Mei, Kai Cao, Chao Yuan
Summary: Building Energy Modelling (BEM) plays a significant role in predicting future building energy demands and urban climate resilience. This study investigates the impact of weather datasets on BEM performance and shows that using developed microclimate data results in more accurate predictions compared to traditional datasets. The method is further utilized to predict energy consumption under pandemic and climate change scenarios, providing scientific support for future energy planning.
SUSTAINABLE CITIES AND SOCIETY
(2022)
Article
Construction & Building Technology
Chao Yuan, Ruixuan Zhu, Shanshan Tong, Shuojun Mei, Wei Zhu
Summary: Natural ventilation is an important resource for lowering indoor temperatures in sub/tropical areas. However, the anthropogenic heat from mechanical cooling systems in high-density urban contexts can have a significant impact on naturally ventilated indoor spaces. This study focuses on residential neighborhoods and aims to develop evidence-based strategies to improve residential building design and mitigate the negative effects of anthropogenic heat. A parametric study using Computational Fluid Dynamics (CFD) models was conducted to investigate the impact of various design parameters on indoor air temperature increment.
ENERGY AND BUILDINGS
(2022)
Article
Thermodynamics
Yang Cai, Bing-Hua Hong, Shi-Qiang Zhuang, Rong-Bang An, Wei-Xiong Wu, Fu-Yun Zhao
Summary: This study investigates the energy conversion potential of a solar thermoelectric generator brick with double phase change materials (STEGB-DPCM) applied on both the hot and cold sides. The results show that the output power of STEGB-DPCM can be significantly enhanced, and the energy and exergy efficiencies are positively correlated with the convective heat transfer coefficient. Furthermore, the application of phase change materials effectively reduces the heat flux and brick temperature, decreasing the demand for indoor cooling implement.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Yang Cai, Bing-Hua Hong, Wei-Xiong Wu, Wei-Wei Wang, Fu-Yun Zhao
Summary: In this study, a comprehensive numerical model is developed to investigate the active cooling performance of a phase change material (PCM)-based thermoelectric device. The results show that the PCM-based thermoelectric device has a longer cooling time and higher energy and exergy efficiencies.
Article
Engineering, Mechanical
Jiang-Tao Hu, Shuo-Jun Mei
Summary: This study investigates the thermosolutal convection under cross-diffusive effects in a salt gradient solar pond (SGSP) using the Lattice Boltzmann Method. The influence of various factors on the thermal and solutal transport characteristics are considered. The results show that the Soret and Dufour effects have significant impacts on the transport processes, while internal heat generation inhibits the processes. The buoyancy ratio can enhance the processes, and the permeability and thickness of the porous layer also play important roles. This study contributes to the thermal storage enhancement and future development of SGSP.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Green & Sustainable Science & Technology
Wei-Wei Wang, Hong-Liang Zhang, Yong-Juan Song, Jia-Wei Song, Dun-Ke Shi, Fu-Yun Zhao, Yang Cai
Summary: In this study, the combination of solar collectors and pulsating heat pipes (PHPs) was proposed to enhance solar energy conversion and management. Through comprehensive experimental and theoretical investigations, the flow stability and heat transfer performance of PHPs were studied, providing guidance for the optimization and application of PHP-solar collectors.
Article
Construction & Building Technology
Shuo-Jun Mei, Yongling Zhao, Tanya Talwar, Jan Carmeliet, Chao Yuan
Summary: This study investigates the impact of wind buoyancy on the dispersion of traffic pollutants at the neighborhood scale. By adopting a Large Eddy Simulation (LES) turbulence model and realistic urban morphology and traffic pollutant emission data, the study reveals that buoyancy-driven flow at the neighborhood scale leads to air pollutant dispersion of comparable strength to wind-driven dispersion. The study emphasizes the importance of considering the coupling effects of buoyancy, emission location, urban density, and wind conditions in evaluating air pollutant dispersion in real urban areas.
BUILDING AND ENVIRONMENT
(2023)
Article
Thermodynamics
Xin-Zhi Huang, Wei-Wei Wang, Fu-Yun Zhao, Hong-Liang Zhang, Hang Xu, Dun-Ke Shi, Yang Cai
Summary: The study establishes a one-dimensional thermal conductivity model for an internal irreversible thermoelectric element and analyzes two evaluation indexes, cooling capacity (Q(c)) and coefficient of performance (COP). A thermodynamic model of thermoelectric cooling (TEC) is constructed with finite time thermodynamics. The effects of current and heat transfer area ratio on TEC's steady-state characteristics are discussed under Newtonian linear heat transfer. Furthermore, a transient thermodynamic model of TEC equipment is built to compare the impact of pulse parameters on the cold side temperature. The theoretical results indicate the effective working range of the steady-state operating current and the reasonable range of the heat transfer area ratio. In addition, increasing the heat transfer capacity of the hot side enhances the cooling capacity. The current research is significant for the optimization design and performance improvement of thermoelectric coolers.
NUMERICAL HEAT TRANSFER PART B-FUNDAMENTALS
(2023)
Article
Thermodynamics
Bing-Hua Hong, Ze-Yu Zhou, Xiao-Yan Huang, Jian-Wei He, Yang Cai, Wei-Wei Wang, Fu-Yun Zhao
Summary: This study proposed an annular thermoelectric generator with phase change material (PCM) (ATEG-PCM) and found that the energy efficiency of ATEG-PCM reaches its peak when the PCM height is 10mm to 12mm. Comparative analysis suggests that ATEG-PCM deserves more attention than other methods enhancing thermal management and power generation with the help of PCM.
APPLIED THERMAL ENGINEERING
(2023)
Review
Construction & Building Technology
Yang Cai, Jian-Wei He, Xiao-Yan Huang, Fu-Yun Zhao
Summary: Solar photocatalytic ventilation wall (SPVW) is an efficient and cost-effective option for eliminating indoor volatile organic pollutants. This review explores the development of SPVW system and critically analyzes the literature on photocatalysts, models, mechanism, parameter analysis, and evaluation of this multifunctional system. The study also examines the effects of various parameters on the solar photocatalytic characteristics and natural ventilation performance.
INDOOR AND BUILT ENVIRONMENT
(2023)
Article
Thermodynamics
Bing-Hua Hong, Yang Cai, Jian-Wei He, Xiao-Yan Huang, Wei-Wei Wang, Fu-Yun Zhao
Summary: Previous studies mainly focused on the generation capacity of phase change material based thermoelectric generator (PCM-TEG) under steady-state or single pulsed heat sources, lacking the reflection of TEG's dynamic characteristics under diversified actual heat sources. This work proposes a three-dimensional transient numerical model to characterize the energy harvesting process of PCM-TEG under multiple pulsed heat sources. The results demonstrate that the temperature difference and output power of PCM-TEG change periodically with the pulsed heat sources.
APPLIED THERMAL ENGINEERING
(2023)
Article
Construction & Building Technology
Xiao-Yan Huang, Jian-Wei He, Ying-Xi Huang, Yang Cai, Wei-Wei Wang, Fu-Yun Zhao
Summary: This study proposed a novel solar ventilated facade integrated thermoelectric energy harvesting panel (SVF-TEHP) to enhance power generation and thermal insulation using solar energy. A coupled simulation model was used to explore the effect of key parameters on the performance of the SVF-TEHP. Comparison with conventional walls showed that the SVF-TEHP can significantly decrease interior wall temperature and generate a considerable amount of power. Economic analysis indicated a short payback period for this system.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Wei Zhu, Liqing Zhang, Shuo-Jun Mei, Chao Yuan
Summary: The coexistence of developed areas and historic buildings is a significant issue in urban planning. This study examines this topic from the perspective of urban microclimate, using a multi-physics CFD simulation. The impacts of new developments on air flow and temperature are assessed, and mitigation strategies are proposed to improve the outdoor thermal environment.
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)
