Article
Thermodynamics
Runfa Zhou, Minqi Wang, Zhenghao Jin, Shuhong Li
Summary: In this study, a mathematical model was established based on the ammonia solution falling film absorber to describe the enhancement of nanoparticles in an absorption refrigeration system. The model considered the momentum exchange and properties modifications caused by nanoparticles. Experimental results showed that the predicted absorption rate of the absorber had a maximum relative error of 8.9% compared to the measurement. It was also found that the enhancement of nanoparticles was more significant with lower mass flow rate or poorer ammonia mass fraction.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Energy & Fuels
Wassim Salameh, Rida Nuwayhid, Ali Al Shaer, Mostafa Gad El-Rab
Summary: The demand for electric power is increasing, which requires processes with lower electricity consumption. Ammonia-water absorption systems can achieve cooling or refrigeration by using thermal-driven units. This study found that a 42 m(2) parabolic trough concentrating solar collector system can provide the necessary heat input for an ammonia refrigeration cycle in Beirut's weather conditions, allowing the system to operate all day and night.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2022)
Review
Energy & Fuels
Devendra Raut, Vilas R. Kalamkar
Summary: Refrigeration is an important part of human comfort, but it consumes nearly 20% of the commercial industry's total energy consumption. The use of fossil fuels for refrigeration systems contributes to global warming, while refrigerants also contribute to global warming and ozone layer depletion. The vapor absorption refrigeration system with water-lithium bromide has the potential to eliminate harmful residuals and carbon emissions. Solar energy, although intermittent, can be used with latent heat storage technology to ensure continuous operation. This review provides insights into suitable phase change materials, storage tank designs, and performance enhancement techniques for integrating latent heat storage with vapor absorption refrigeration systems.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Green & Sustainable Science & Technology
Zengguang Sui, Chong Zhai, Wei Wu
Summary: This study proposes novel enhancement structures to improve the absorption characteristics of flat membrane-based absorbers. Through parameter studies and comparative analysis, it is recommended to use inclined groove (IG) and herringbone groove (HG) structures for enhanced absorption performance.
Review
Energy & Fuels
Vishnuvardhan Reddy Mugi, V. P. Chandramohan
Summary: Solar drying of food products offers economical and environmentally friendly method for extending shelf-life. Various factors such as shrinkage, effective diffusion coefficient (De), surface transfer coefficients play a major role in influencing the solar drying process. Mathematical models are utilized to determine these factors and their influencing factors like moisture content, air temperature, velocity, thickness and geometry of the product are discussed. This review provides valuable insights and recommendations for further research in solar drying area.
Article
Thermodynamics
Beethoven Narvaez-Romo, Eli W. Zavaleta-Aguilar, Jose R. Simoes-Moreira
Summary: This study investigates the energy balance, heat transfer, and mass transfer analysis of ammonia-water mixtures in a generator and rectifier using falling film technology. Experimental results show that falling film technology operates at lower temperatures and has better heat and mass transfer performance compared to traditional flooded generator technologies.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2022)
Article
Green & Sustainable Science & Technology
G. Antony Casmir Jayaseelan, A. Surenderpaul, T. Thandial Selvam, A. Anderson, A. Senthilkumar, Avinash Malladi, R. Venkatesh, V. N. Aneesh, R. Saravanan
Summary: The investigation explores the utilization of different fluid pairs for effective utilization of solar thermal energy in heat pump applications, such as zeolite/water, silica gel/water, and alumina nanofluid/water. The effect of fluid pairs on heat transfer rate, thermal adsorption, and mass loss of heat pump is studied. The results revealed that alumina nanofluid-operated heat pump showed higher thermal adsorption behavior and heat transfer rate.
CLEAN TECHNOLOGIES AND ENVIRONMENTAL POLICY
(2023)
Article
Thermodynamics
Syed Muhammad Ammar, Chan Woo Park
Summary: The absorption refrigeration system is being optimized with a focus on the evaporator, where improvements in wettability and reduction of liquid film uneven distribution are key targets. Using smaller diameter tubes to optimize performance shows a peak heat transfer coefficient at the transition Reynolds number. Experimental correlations were developed to predict data within +/- 20% accuracy.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Runfa Zhou, Minqi Wang, Shuhong Li
Summary: This paper proposes a method to enhance mass transfer in an ammonia-water falling absorber by implementing ultrasonic oscillators. The results show that the total mass transfer coefficient and ammonia absorbed rate increase significantly with the increase of sound intensity at the surface of the oscillator. The enhancement effect also increases with oscillation output power.
APPLIED THERMAL ENGINEERING
(2022)
Article
Engineering, Environmental
Fei Liu, Gary T. Rochelle, Tao Wang, Eric Chen, Mengxiang Fang
Summary: Amine scrubbing is a promising technology for CO2 capture, with the biphasic solvent of 25% AEEA/50% DEEA showing potential for significant reduction in regeneration energy. The fast CO2 absorption rate of the solvent, especially at higher CO2 equilibrium partial pressure, makes it an efficient option for reducing capital costs.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Thermodynamics
Minlin Yang, Elaine Low, Chung Lim Law, Jie-Chao Chen, Pau Loke Show, Si-Min Huang
Summary: The study focuses on the performance of a membrane-based absorption heat pump in recovering low-temperature waste heat from used cooling water. By optimizing the design of the air gap width, the solution temperature can be significantly increased, leading to improved efficiency and performance of the heat pump.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Engineering, Environmental
Imene Berkane, Ignacio Aracil, Andres Fullana
Summary: The drying of flexible plastic waste is a significant issue in the plastic recycling sector. The thermal drying process is costly, energy-consuming, and environmentally problematic. This research aimed to study the behavior of flexible plastic in a convective drying process at a laboratory scale, investigating factors such as velocity, moisture, size and thickness of the plastic flakes, and developing a mathematical model for predicting drying rate. The results showed that heat transfer was the dominant mechanism in the drying process, and certain equations provided the best prediction for fixed and fluidized bed systems.
Article
Thermodynamics
S. Abhinand, Amrita Sharma, Hardik B. Kothadia
Summary: This study investigates the melting phenomena in a Latent Heat Thermal Storage System (LHTSS) using ice as Phase Change Material (PCM) with fins incorporated to improve thermal performance. The PCM-based storage system shows potential in addressing energy supply-demand imbalance. Computed simulations determine the optimal number of fins for improved heat transfer and minimum melting time. The effects of the optimum fin number on different factors such as HTF tube arrangement, diameter, and temperature are evaluated. Comparisons are made using criteria such as liquid fraction, mean temperature, heat transfer rate, and coefficient.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Andres Zapata, Carlos Amaris, Alexis Sagastume, Andres Rodriguez
Summary: The study provides a detailed description and assessment of a 3D CFD bubble absorber model for simulating the absorption process of NH3/LiNO3 solution in a vertical double pipe. The validation of the model shows good accuracy in predicting absorption mass flux and solution heat transfer coefficient.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Akash Jadhav, Devendra Raut, Vilas R. Kalamkar
Summary: The generator plays a crucial role in the absorption refrigeration system, providing a major input. Existing studies on LiBr-H2O vapor absorption refrigeration systems have mostly focused on high-capacity commercial systems. The detailed analysis and feasibility of generator designs for low-capacity systems are lacking. This study aims to explore the design and performance of a shell and tube heat exchanger as a vapor generator for a residential application. Experimental investigations were carried out to evaluate the heat exchanger's performance for a 0.5 ton refrigeration system, and it was found to be most effective at an inlet temperature of 80°C, with a flow rate of 3 L per minute, and an initial pressure of -0.65 bar.
APPLIED THERMAL ENGINEERING
(2023)
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)