Article
Energy & Fuels
Cagri Kutlu, Emmanuel Tapia-Brito, Osaru Agbonaye, Yuehong Su, Stefan Thor Smith, Ben Hughes, Saffa Riffat
Summary: In long-term heat storage, heat loss is a problem for common phase change material (PCM) systems. However, controllable supercooled PCM provides a solution by releasing latent heat only when triggered to crystallize. An electrical triggering mechanism was constructed and tested to control the crystallization of PCM in this study.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Energy & Fuels
Tlegen Kamidollayev, Juan Pablo Trelles, Jay Thakkar, Jan Kosny
Summary: Heat exchangers play a crucial role in thermal control in buildings, and the use of phase change materials (PCMs) enhances heat exchange processes. This study analyzes the performance of different configurations of PCM-air heat exchangers through simulation, aiming to determine the optimal thermal charging time.
Article
Energy & Fuels
Nezir Yagiz Cam, Ersin Alptekin, Levent Bilir, Mehmet Akif Ezan
Summary: This study investigates the performance of a solar-assisted latent heat thermal energy storage (LHTES) unit integrated with a heat pump under variable weather conditions. The use of phase change materials (PCMs) with specific melting temperatures and latent heat of fusions is studied. Results show that the integration of the solar-aided LHTES unit with the heat pump increases the heat pump's coefficient of performance (COP) and significantly reduces the operating costs of the heating device.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Thermodynamics
Devendra Raut, Saurabh Lanjewar, Vilas R. Kalamkar
Summary: This study investigates the effect of geometric and operating parameters on the charging of phase change material (PCM) in a vertical helical coiled latent heat storage (LHS) system. The results show that increasing the coil spacing and HTF inlet temperature can improve the charging process, while varying the HTF flow rate has no significant impact on the charging rate of the PCM.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Energy & Fuels
Rahul Agrawal, Krishna Deo Prasad Singh
Summary: The scarcity of potable water is a primary concern worldwide, and this research explores the use of binary eutectic phase change materials (PCM) in solar desalination systems to improve energy efficiency and hourly yield. Experimental and simulation results show the feasibility of the modified system, with negligible deviation between the two.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Thermodynamics
Cagatay Yildiz, Mustafa Secilmis, Muslum Arici, Mehmet Selcuk Mert, Sandro Nizetic, Hasan Karabay
Summary: Considering the intermittent nature of solar energy and its usage even in the absence of sunlight, this study evaluates the thermal performance of a water-to-water heat pump system with a thermal energy storage unit. By designing and integrating a thermal energy storage unit into a heat pump experimental rig, the effects of different flow rates and water temperatures, as well as the inclusion of phase change material, are analyzed. The results show that the inclusion of phase change material can significantly improve heating time and coefficient of performance, but the impact varies depending on the water temperature. The trade-off between sensible and latent heat storage is emphasized in this study.
Article
Thermodynamics
Samar Singhal, Ashwini Kumar Yadav, Ravi Prakash
Summary: In tropical conditions, the temperature exceeding the recommended range in greenhouse is a major concern. This study evaluated the thermal performance of an Earth Air Tunnel Heat Exchanger (EATHE) assisted single span saw-tooth greenhouse using both a developed code and a commercial computer program (ANSYS-Fluent). The effectiveness of coupling EATHE to control the greenhouse temperature was assessed under different scenarios of side vent opening. Air movement caused by wind and stack effect was found to be a significant factor affecting the temperature uniformity within the greenhouse. The best thermal performance for optimum plant growth was achieved when both side vents of the greenhouse were connected to EATHE.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Multidisciplinary Sciences
Bashir Eskander Kareem, Ahmed Mohammed Adham, Banipal Nanno Yaqob
Summary: The study investigates the optimization and heat transfer performance of latent heat thermal energy storage system using numerical modeling. The findings show that the height of the air channel, height of PCM slabs, melting temperature of PCM, and length-to-width ratio of heat exchanger significantly impact the melting and solidification rate of PCM.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Thermodynamics
Wenhe Zhou, Rui Li, Yuying Chen, Shiqi Zhu
Summary: In this study, a three-dimensional numerical model was established and Fluent software was used to analyze the effects of well flow, diameter, and depth on the performance of a mid-deep ground source heat pump. The coal-boiler in a Logistics Park in Lanzhou city was transformed to utilize the mid-deep ground source heat pump for heating. The experimental results showed that the numerical analysis was reasonable and the heating system was effective and reliable with an average COP of 3.47 and a cumulative power consumption of 67,727 kWh during the test period.
JOURNAL OF THERMAL SCIENCE
(2023)
Article
Thermodynamics
Jochen Westhaeuser, Christian Schulze, Jan-Christoph Albrecht, Wilhelm Tegethoff, Nicholas Lemke, Juergen Koehler
Summary: Flat tube heat exchangers are compact and commonly used in heat pump applications for energy-efficient heating. Frosting models are used to study heat exchanger performance. However, previous models neglected the effects of water retained after defrosting. In this study, a novel numerical model is developed that considers the transport processes and states of the retained water in a flat tube heat exchanger.
APPLIED THERMAL ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
T. Zhang, Y. F. Zhang, Z. R. Shi, Q. F. Li, J. Y. Cai
Summary: A hybrid PV/T collector/evaporator was designed and a hybrid system named PV-SAHP/GHP was proposed. Outdoor experiments were conducted to compare the operating characteristics of different modes. The results showed that the GHP-PV/T mode had satisfactory energy-saving effect while the PV-SAHP mode met the temperature demand but had unsatisfactory energy conservation effect. It is recommended to operate the GHP-PV/T mode during intense radiation and the PV-SAHP mode otherwise to balance the thermal performance and energy-saving benefits.
Article
Thermodynamics
Mahdi Ghorbani, Hailei Wang
Summary: This study developed a new method to address the modeling challenges of microchannel cross-flow heat exchangers and provided detailed temperature distributions that closely matched experimental data.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Construction & Building Technology
Cagri Kutlu, Yanan Zhang, Qinghua Lyu, Yuehong Su, Saffa Riffat
Summary: This paper proposes a novel approach for improving the performance of a direct-expansion solar-assisted heat pump system by integrating a crystallisation controllable phase change material and building energy demand shifting strategy. The proposed system aims to reduce buildings' energy consumption while utilizing solar energy efficiently.
ENERGY AND BUILDINGS
(2023)
Article
Energy & Fuels
J. F. Belmonte, M. Diaz-Heras, J. A. Almendros-Ibanez, Luisa F. F. Cabeza
Summary: This paper reports the simulation results of two different solar-assisted heat pump systems in Madrid and analyzes the impact of integrating short-term storage tanks on system performance. The study finds that conventional thermostatic control strategies may lead to degradation in system performance, and more advanced control strategies are needed to improve system efficiency.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Green & Sustainable Science & Technology
Mohamed El Habib Amagour, Mounir Bennajah, Adil Rachek
Summary: This study presents a numerical investigation of heat transfer performance inside a compact finned-tube heat exchanger used in latent heat storage. The results show that adjusting operational and design parameters can significantly impact the charging and discharging performance.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Engineering, Chemical
Min Li, Zhiqiang Guan, Yunting Ge, Xinyu Zhang, Changming Ling
Article
Energy & Fuels
Lei Chai, Konstantinos M. Tsamos, Savvas A. Tassou
Article
Thermodynamics
X. Y. Zhang, Y. T. Ge, J. N. Sun
APPLIED THERMAL ENGINEERING
(2020)
Article
Thermodynamics
Lu Zuo, Zihan Liu, Pengzhan Dai, Ning Qu, Ling Ding, Yuan Zheng, Yunting Ge
Summary: The study established an economic analysis model for solar chimney power plant and wind supercharging solar chimney power plant, finding that the addition of wind supercharging device can increase income and net present value, and the annual net income and net present value of WSCPPDW were always larger than those of SCPPDW.
Article
Green & Sustainable Science & Technology
Lu Zuo, Pengzhan Dai, Ziyang Yan, Chuang Li, Yuan Zheng, Yunting Ge
Summary: This paper presents an air turbine design method considering the optimal turbine pressure drop ratio for solar chimney power plants, and investigates the feasibility of this method on system output performance improvement through numerical simulations of a Spanish prototype system. The results show that the proposed design method can improve turbine performance, with higher power output and lower sensitivity to rotational speed. Additionally, the turbine's high-performance rotational speed range is broader under higher solar radiation.
Article
Energy & Fuels
Paul Christodoulides, Rafaela Agathokleous, Lazaros Aresti, Soteris A. Kalogirou, Savvas A. Tassou, Georgios A. Florides
Summary: This paper reviews and discusses the application of waste heat recovery (WHR) technologies in industries, including conventional methods and their limitations. The potential benefits and projected energy and cost savings of alternative new technologies are also explored. The paper also presents a comprehensive review of case studies on the application of WHR technologies.
Article
Thermodynamics
X. Zhang, Y. T. Ge
Summary: The study utilized CFD models to investigate the heat conduction effects of CO2 gas coolers with continuous and split fins. The results indicate that the use of split fins can significantly improve the performance of the heat exchanger.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Green & Sustainable Science & Technology
Valentina Stojceska, Nicholas Parker, Savvas A. Tassou
Summary: This paper analyzes the energy consumption in a biscuit manufacturing company and explores potential solutions for energy efficiency improvement. Significant energy savings and cost reductions can be achieved by optimizing production line management and reducing equipment operation time, while also meeting environmental targets.
Article
Thermodynamics
Lu Zuo, Ziyang Yan, Ning Qu, Pengzhan Dai, Tian Zhou, Yuan Zheng, Yunting Ge
Summary: This paper proposes a novel solar chimney power plant combined with membrane distillation (SCPPMD) that can generate power and produce freshwater. The system's performance is predicted using a transient heat and mass model, and the effects of unsteady weather conditions and seawater thickness are explored.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Thermodynamics
Lu Zuo, Ziyang Yan, Ning Qu, Pengzhan Dai, Shi Chen, Yuan Zheng, Yunting Ge
Summary: This paper evaluates the techno-economic characteristics of the solar chimney power plant combined with membrane distillation (SCPPMD) under typical operating conditions. The results show that the system has positive net present value and is sensitive to inflation rate, loan interest rate, water price, and electricity price. Furthermore, reducing the inlet seawater temperature and increasing seawater thickness increase the water yield but decrease power generation, while reducing air gap spacing significantly increases water yield and power generation.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Energy & Fuels
Lu Zuo, Ziyang Yan, Pengzhan Dai, Tian Zhou, Bo Qu, Yue Yuan, Yunting Ge
Summary: A comprehensive test platform for solar chimney power plant combined with distillation (SCPPCD) was designed and built in this study. Experimental research was conducted under actual meteorological conditions to explore the system operation performance and the laws of freshwater production and power generation. The results reveal the interaction mechanism between various parameters and provide valuable experimental data and theoretical reference for future mathematical simulation research and commercial application of SCPPCD.
Article
Energy & Fuels
Y. T. Ge, P. Y. Lang
Summary: In energy intensive industrial sites like steel plants, recovering waste heat for heating purposes using advanced technologies like metal hydride heat pumps can offer several advantages including low carbon emissions, compactness, and achievable high-temperature heat output. However, selecting suitable alloys for high-temperature metal hydride heat pump systems is critical. This paper presents a comprehensive procedure for alloy selection based on operating temperatures, system efficiencies, and thermodynamic equilibriums, ultimately identifying a finalized alloy pair for each designed temperature of heat pump output.
Article
Engineering, Chemical
Lu Zuo, Long Huang, Pengzhan Dai, Yu Chen, Shi Chen, Yunting Ge
Summary: In order to accurately evaluate the operation and output characteristics of the solar chimney power plant integrated seawater desalination, a refined mathematical model considering convection heat transfer, dewing phenomenon, and disturbance caused by the flow channel boundary was built. The impact of nighttime dewing and humid environments on system performance was discussed. The results show that the use of bellows' forced convection heat transfer coefficient to consider the influence of the flow channel boundary is feasible and appropriate, and the refined mathematical model is more accurate and reliable. Dewing has little effect on system performance due to seawater heat storage, but has a greater negative impact on freshwater production in high humidity conditions. The critical value of relative humidity for dewing to occur is 51%.
Review
Energy & Fuels
Xinyu Zhang, Yunting Ge
Summary: Supercritical CO2 (S-CO2) thermodynamic power cycles have been extensively studied in fossil fuel and nuclear power generation systems for their compactness, sustainability, cost-effectiveness, environmentally friendly working fluid, and high thermal efficiency. They can be integrated with various renewable energy systems for low-carbon power generation. However, there is a lack of reviews specifically focusing on the integration of S-CO2 with renewable energy. This paper provides an overview of the development of S-CO2 renewable energy systems, identifies technology and integration opportunities for different types of renewable resources, and reviews recent research activities worldwide.
Review
Horticulture
Edna Makule, Noel Dimoso, Savvas A. Tassou
Summary: Fruits and vegetables are more susceptible to high postharvest loss and one key strategy to overcome such losses is through cold chain integration. However, most developing countries lack the basic infrastructure and management skills needed for integrated cold chains, particularly in rural areas. This review addresses the need to adopt and strengthen measures for precooling and cold storage of fruits and vegetables to improve their value chains, especially for small-scale farmers in rural communities.
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)
