Article
Thermodynamics
Zhaoyang Cui, Qian Du, Jianmin Gao, Rushan Bie
Summary: A deep cooling tower was designed to efficiently recover waste heat and gaseous water from humid flue gas. The design of tower equipment and absorption heat pump system was optimized. The running resistance of the tower is less than 240 Pa, and the structured packing achieves maximum heat transfer power under different liquid to gas ratios. The absorption heat pump system has a coefficient of performance of 1.71, and can achieve significant energy and water recovery, as well as reduce emissions of CO2, dust, SO2, and NOx.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Ying Xi, Zhikang Yu, Lin Zhang, Aimei Yu, Lei Liu, Bingguo Bao, Youchang Zhao, Chengman Zhou, Bingjie Wu, Kexin Dong
Summary: This study develops a new type of straight wave packing to improve the heat and mass transfer characteristics of counterflow wet cooling towers. Experimental and numerical simulations investigate the effects of inlet air velocity, water drenching density, gas-liquid ratio, and packing height on the cooling tower's heat and mass transfer characteristics. Results show that compared to conventional straight wave packing, the novel packing increased cooling efficiency by 14.4%, providing a new approach for engineering practice. Analysis of the tower's operating conditions suggests that taller packing heights make it easier to meet cooling requirements, and smaller gas-liquid ratios and required air volumes can save up to 30% of the maximum air volume.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Weipeng Deng, Fengzhong Sun, Kun Chen, Xiaoyu Zhang
Summary: This study establishes a 3D model of the hybrid mechanical draft wet cooling tower (hybrid MCT) and explores its operation mechanism. The plume, water saving, and cooling capacity of the hybrid MCT are discussed. Results show that the ambient dry bulb temperature and circulating water temperature have a significant impact, while the relative humidity and circulating water flow rate have a relatively small impact. By adjusting the circulating water flow rate ratio and airflow resistance in the dry part, the water saving rate and cooling capacity of the hybrid MCT can be enhanced.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Construction & Building Technology
Sampath Suranjan Salins, Shiva Kumar, Ana Tejero Gonzalez, Sawan Shetty
Summary: This study focuses on the design and construction of a forced draft counter flow cooling tower unit using different packing materials. The performance parameters of the cooling tower are determined through experiments, and it is found that the type of packing material significantly affects the tower's efficiency. Among the different packing materials, Celdek 7090 shows the best performance and energy efficiency.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Thermodynamics
Xiaohui Zhou, Weijia Wang, Lei Chen, Lijun Yang, Xiaoze Du
Summary: A novel water distribution mode is proposed for natural draft wet cooling tower, which divides the water distribution area into four subdomains with different diameters of sprayed water droplets to enhance cooling performance. The new water distribution mode increases air velocity in the central area and improves thermal performance in the external area.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
J. H. Yu, Z. G. Qu, J. F. Zhang, S. J. Hu, J. Guan
Summary: A new coupling model considering the interaction among spray zone, rain zone, and packing was proposed for investigating the thermal performance of counter-flow wet cooling towers. Experimental results showed a significant reduction in relative error when the spray zone and rain zone were coupled with packing, and the efficiency and exit water temperature of the cooling tower were affected by various factors.
Article
Thermodynamics
Weipeng Deng, Fengzhong Sun
Summary: An annular mechanical draft wet cooling tower group shows better thermal performance in resisting the adverse effects of crosswind, improving the thermal performance of the leeward tower, and reducing the fluctuation range of outlet water temperature.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Mehdi Rahmati
Summary: This study investigates the thermal performance of a mechanical draft wet cooling tower using different packing densities and Zinc Oxide (ZnO) nanoparticles. The results show that increasing the number of packing layers and weight concentrations of nanofluid can enhance the tower's performance, with more notable effects when using denser packing materials.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2021)
Article
Thermodynamics
Jiamei Fang, Xuhui Zhao, Lin Zhang, Shi Bu, Zhikang Yu, Weigang Xu, Yiyang Hu, Yanfei Shan, Yong Li
Summary: A new heat transfer strategy to improve the thermal performance of closed wet cooling towers (CWCT) is proposed and validated through theoretical and experimental research. The influence of fan frequency, spray density, and processing water flow on the thermal performance of CWCT is studied, and an empirical formula for heat transfer coefficient is obtained.
JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS
(2022)
Article
Thermodynamics
Hazim Alwan Mejbil, Hayder Mohammad Jaffal
Summary: The experimental study revealed that utilizing ribbed and truncated fins in the heat sink offers better thermal performance compared to traditional flat fins. Furthermore, it was found that the heat sink with ribbed fins is more effective than that with truncated fins, leading to an improvement in heat transfer efficiency.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Zefang Zhao, Jingpu Gao, Xiaojing Zhu, Qinggang Qiu
Summary: This paper investigates the influence of small grooves on the cooling performance of cooling towers using commercial corrugated packing. Experimental and comparative research on thermal and resistance characteristics was conducted for different types of film packing, including the original packing. The results show that parallel small grooves change the cooling capacity and efficiency of packing, while crossed small grooves reduce the cooling performance. The resistance results indicate that small grooves have a weak effect on pressure drop for film packing. The study also determines empirical formulas for thermal and resistance characteristics as a guide for the use of packing in cooling towers.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Weipeng Deng, Fengzhong Sun, Kun Chen, Xiaoyu Zhang
Summary: This study compares the plume, water saving, and thermal performance of mechanical draft wet cooling tower (MCT) and hybrid MCT through experiments. The results show that the hybrid MCT can achieve plume abatement and water saving, but its thermal performance will be weakened. The difficulty of plume abatement will increase at lower ambient dry bulb temperature and higher relative humidity. The working conditions of the hybrid MCT have a great influence on the water saving rate, which ranges from 5.9% to 14.4% in this study.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Cuilin Zhao, Mingwei Wang, Qi Gao, Shen Cheng, Suoying He, Jifang Zhao, Jianwei Zhan, Zhilan Liu, Zhe Geng, Shuzhen Zhang, Jianhui Qi, Ming Gao, Yuetao Shi
Summary: To address the poor cooling performance of mechanical draft dry cooling towers (MDDCT) in high ambient temperatures, this study proposes a dry-wet hybrid cooling technology that utilizes wet media to evaporatively cool the inlet air of the MDDCT. A MATLAB program is developed to investigate the effects of different variables on the cooling performance of the dry-wet hybrid cooling tower and its control strategy. The results demonstrate that the dry-wet hybrid cooling tower outperforms the MDDCT in high ambient temperatures, and the cooling performance can be significantly improved by adjusting the medium type, thickness, ambient temperature, humidity, and fan speed.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Weipeng Deng, Fengzhong Sun, Runchen Wang, Keting He
Summary: This paper explores the performance influence of louvers on mechanical draft wet cooling towers (MCTs) by describing the specific structure of the louver and conducting numerical analysis. The results show that the thermal and ventilation performance of MCTs can be regulated by controlling the inclination angle of louvers. The optimal thermal performance is achieved when the inclination angle is 90 degrees.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Weipeng Deng, Fengzhong Sun, Kun Chen, Xiaoyu Zhang
Summary: Under crosswind conditions, the airflow distribution of the mechanical draft wet cooling tower group becomes uneven, leading to reduced cooling capacity of leeward towers. A new retrofit method is proposed to improve the cooling capacity by removing the tower wall between the rain zone of the tower group. Numerical calculation and analysis show that the retrofit tower group can achieve a more uniform distribution of outlet water temperature and increase the circulating water temperature drop of the leeward tower under certain crosswind angles.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Mechanics
Amirreza Panahi, Ahmad Reza Pishevar, Mohammad Reza Tavakoli
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2020)
Article
Engineering, Mechanical
Mehran Karbasi Pour, Mahdi Nili-Ahmadabadi, Reza Zaghian, Mohammad Reza Tavakoli, Kyung Chun Kim
Summary: Increasing the distance between two obstacles leads to the formation of more and larger vortices, ultimately reducing wave energy; the situation between the obstacles affects the formation and evolution of vortices.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2021)
Article
Biology
Kowsar Teimouri, Mohammad Reza Tavakoli, Ashkan Ghafari, Kyung Chun Kim
Summary: The study investigated the effect of an external magnetic field on pulsatile blood flow in a stenosed curved artery, finding that the magnetic field increases wall shear stress and pressure in deoxygenated blood, with a greater impact on deoxygenated blood. Decreasing the occlusion percentage of the artery increased the magnetic field's influence on blood flow. The study concluded that a magnetic field of Mn = 2.5 can be safely used for MDT in such a stenosed curved artery.
COMPUTERS IN BIOLOGY AND MEDICINE
(2021)
Article
Engineering, Biomedical
Mehdi Rahmati, Xiaolin Chen
Summary: Circulating Tumor Cells (CTCs) are important in early cancer detection and the dielectrophoretic DLD technique can effectively separate CTCs by utilizing cell size and dielectric properties. This technique operates at high flow rates and continuous separation is achieved by applying a field frequency close to the crossover frequency of CTCs.
BIOMEDICAL MICRODEVICES
(2021)
Article
Biophysics
Arian Aghilinejad, Rashid Alavi, Bryson Rogers, Faisal Amlani, Niema M. Pahlevan
Summary: Intrinsic Frequency (IF) is a systems-based approach that provides valuable information for hemodynamic monitoring of the left ventricle (LV), the arterial system, and their coupling. Recent clinical studies have demonstrated the clinical significance of this method for prognosis and diagnosis of cardiovascular diseases. The study found that displacement-based computations of omega(1) and omega(2) are accurate in vessels that exhibit elastic behavior, such as carotid arteries, and can serve as suitable surrogates for pressure-based IFs.
JOURNAL OF BIOMECHANICS
(2021)
Article
Materials Science, Multidisciplinary
Kowsar Teimouri, Mohammad Reza Tavakoli, Ashkan Ghafari, Kyung Chun Kim
Summary: Magnetic drug targeting (MDT) is an effective technique for treating diseases by transferring magnetic particles labeled with therapeutic agents in the presence of a magnetic field. The study investigated the targeted delivery of endothelial cells with magnetic particles in stenosed curved arteries using external magnetic fields and found that adjusting parameters such as magnetic particle mass, field strength, injection time, occlusion percentage, and stenosis length can impact cellular capture efficiency, with elastic arteries showing higher efficiency compared to rigid ones.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Mechanics
Mohsen Mahmoodi, Mahdi Nili-Ahmadabadi, Ali Minaeian, Mohammad Reza Tavakoli, Mahmood Norouzi, Kyung Chun Kim
Summary: This study numerically investigates the flow of viscoelastic fluid in curved ducts, revealing the generation of eight corner vortices in a straight duct due to differences in the second normal stress. Additionally, the effects of curvature ratio on the distribution of first and second normal-stress differences in developing Dean flow were studied for the first time, showing higher intensity of secondary flows in viscoelastic fluid compared to Newtonian fluid.
Article
Engineering, Marine
Ashkan Ghafari, Mohammad Reza Tavakoli, Mahdi Nili-Ahmadabadi, Kowsar Teimouri, Kyung Chun Kim
Summary: This paper investigates the interaction of solitary waves with two submerged rectangular obstacles through experiments and numerical simulations. The results suggest that the height and distance of obstacles have a significant impact on wave height, energy loss, and vortex strength.
Article
Green & Sustainable Science & Technology
Shahriar Kazemi, Mahdi Nili-Ahmadabadi, Mohammad Reza Tavakoli, Reza Tikani
Summary: This paper experimentally studied energy harvesting from sea waves' longitudinal and transverse motions using a waterproof piezoelectric wave energy harvester. The O-1 orientation was found to be the optimal orientation for energy harvesting, as it generated the maximum voltage. Selecting the optimum electrical load resistance resulted in the maximum harvested power.
Article
Polymer Science
Parisa Niazi, Mahdi Javanbakht, Mehdi Karevan, Mohammad Reza Tavakoli
Summary: In this study, hollow glass microspheres (HGMs) were used as fillers to enhance the thermal properties of polyester resin. Experimental and numerical results showed that the thermal conductivity coefficient decreases with increasing HGM weight fraction, while the size and distribution of HGMs have no practical effect on the conductivity coefficient. Additionally, using the constant specific heat capacity and thermal conductivity coefficient of the matrix showed better agreement with the experiment results.
Article
Materials Science, Multidisciplinary
Mohammad Mojaddarasil, Ali Kiani, Mohammad Reza Tavakoli, Mohsen Badrossamay
Summary: This study evaluated the effects of encapsulation gas parameters on powder bed temperature distribution in the SLS process. The results showed that helium and argon had the most and least uniform temperature distributions, respectively. Increasing gas pressure improved the uniformity of temperature distribution. Furthermore, increasing gas heat capacity up to a certain value increased the uniformity, while exceeding that value decreased it.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Multidisciplinary Sciences
Rashid Alavi, Arian Aghilinejad, Heng Wei, Soha Niroumandi, Seth Wieman, Niema M. Pahlevan
Summary: This study introduces a physiologically accurate in-vitro hydraulic setup that models the hemodynamics of the coupled atrioventricular-aortic system. The setup allows for two-way hemodynamic couplings and demonstrates a remarkable correspondence to clinical hemodynamics. The study also investigates the physiological relevancies of major global parameters in the circulatory system.
Article
Multidisciplinary Sciences
Rashid Alavi, Qian Wang, Hossein Gorji, Niema M. Pahlevan
Summary: Analysis of cardiovascular waveforms provides valuable clinical information. The intrinsic frequency (IF) method extracts physiologically relevant information about the cardiovascular system. This study proposes a machine learning-based method for determining IF parameters from a single carotid waveform. The method shows strong correlations with the standard L2 optimization-based method, regardless of measurement apparatus and device sampling rate.
Review
Public, Environmental & Occupational Health
Mahmood Nekoei Moghadam, Mohammad Reza Amir Ismaili, Mohammad Reza Tavakoli
Summary: Through the Patient Safety Friendly Hospital Initiative (PSFHI) assessment tool, the safety status of Iranian hospitals in terms of patient safety was evaluated. The results showed that there are some issues, such as low scores in engaging and interacting with the patient and the community. It is important to institutionalize a patient safety culture, focus on patient identification, educate staff and patients, and remove legal barriers to improve compliance with mandatory patient safety standards in Iran.
IRANIAN JOURNAL OF PUBLIC HEALTH
(2022)
Article
Mechanics
Mehdi Rahmati, Seyedvahid Khodaei
Summary: Research indicated that fluid viscosity and nanoflow effects can influence the velocity profile inside carbon nanotubes, thereby affecting the stability of CNTs. By deriving a dimensionless velocity profile correction factor, the influence of Knudsen number on system stability is considered. Experimental results showed that considering the effect of non-plug flow velocity profile decreases the predicted critical flow velocity, leading to divergence instability at lower flow velocities.
INTERNATIONAL JOURNAL OF FLUID MECHANICS RESEARCH
(2021)
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)
