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
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
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
Weipeng Deng, Fengzhong Sun, Kun Chen, Xiaoyu Zhang
Summary: This article introduces a new mechanical draft wet cooling tower that can solve the problems of water resource waste and visible plumes caused by wet cooling towers. A hot experiment was conducted to analyze the plume, water saving, and cooling performance of the tower. The results show that the tower with the new design does not produce plumes and has high water saving and cooling effects under certain conditions.
APPLIED 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
Lei Liu, Yixiang Ji, Lin Zhang, Zhikang Yu, Hongwei Qian, Yong Li, Jiuru Hu, Kexin Dong
Summary: A new condensing module has been developed to improve heat transfer efficiency and reduce water losses and white mist in cooling towers. Experimental results show that the new module outperforms the conventional module in terms of temperature difference and flow rate.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Weipeng Deng, Fengzhong Sun, Kun Chen, Xiaoyu Zhang
Summary: This study proposes a rectangular module with plume abatement and water saving performance to improve the mechanical draft wet cooling tower (MCT). The plume, water saving, and thermal performance of MCT under different environmental parameters, circulating water parameters, and crosswind conditions are analyzed. The results show that relative humidity, circulating water temperature, circulating water flow rate, and dry-bulb temperature have significant impacts on the plume generation probability. The use of the rectangular module significantly improves water saving and eliminates the plume.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
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
Chemistry, Physical
Siyu Wu, Yong Kang, Zihao Zhao, Xinhe Liu
Summary: The study found that combining pulsed electric field with superhydrophobic fibrous coalesce can effectively remove mist and improve water recovery efficiency from wet cooling towers.
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
(2021)
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
Thermodynamics
M. Muneeshwaran, Chi-Chuan Wang
Summary: The study aims to reduce the airside pressure drop of rectangular plain heat exchangers using superhydrophobic coating, which can lead to significant increases in heat transfer efficiency with higher inlet air temperatures and relative humidities.
ENERGY CONVERSION AND MANAGEMENT
(2021)
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
Thermodynamics
Nicolas Jourdan, Mohamed Kanniche, Thibaut Neveux, Olivier Potier
Summary: This study aims to investigate the hydrodynamic behavior of air-water counter flows in wet cooling towers using Computational Fluid Dynamics (CFD) simulations. The simulations successfully reproduced water falling films on the packing surface and allowed the calculation of local and system parameters. The results showed trends of increasing liquid film thicknesses and wetting rates with increasing water flowrate in agreement with experimental observations. A correlation of the interfacial area as a function of hydrodynamic adimensional numbers was proposed to characterize transfer phenomena in the packing.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2023)
Article
Energy & Fuels
Qingbo Deng, Jingyu Ran, Juntian Niu, Zhongqing Yang, Ge Pu, Lin Yang
Summary: In the wet gas desulphurization tower, the uneven distribution of flue gas can be counteracted by increasing the amount of slurry spray and integrating the flow field. Lowering the inlet velocity helps improve flow field uniformity and reduces energy and material consumption.
JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME
(2021)
Article
Thermodynamics
Hai Zhao, Puzhen Gao, Xiaochang Li, Ruifeng Tian, Hongyang Wei, Sichao Tan
Summary: This study numerically investigates the interaction between flow-induced vibration and forced convection heat transfer in a tube bundle. The results show that the impact of flow-induced vibration on heat transfer varies in different flow velocity regions.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Rohit Chintala, Jon Winkler, Sugirdhalakshmi Ramaraj, Xin Jin
Summary: The current state of fault detection and diagnosis for residential air-conditioning systems is expensive and not suitable for widespread implementation. This paper proposes a cost-effective solution by introducing an automated fault detection algorithm as a screening step before more expensive tests can be conducted. The algorithm uses home thermostats and local weather information to identify thermodynamic parameters and detect high-impact air-conditioning faults.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
A. Azimi, N. Basiri, M. Eslami
Summary: This paper presents a novel optimization algorithm for improving the water-film cooling system of photovoltaic panels, resulting in a significant increase in net energy generation.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Duc-Thuan Phung, Chin-Hsiang Cheng
Summary: In this study, a novel CFDMD model is used to analyze and investigate the behavior of thermal-lag engines (TLE). The study shows that the CFDMD model effectively captures the thermodynamic behavior of the working gas and the dynamic behavior of the engine mechanism. Additionally, the study explores the temporal evolution of engine speed and the influence of various parameters on shaft power and brake thermal efficiency. The research also reveals the existence of a thermal-lag phenomenon in TLE.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Haiying Yang, Yinjie Shen, Lin Li, Yichen Pan, Ping Yang
Summary: The purpose of this article is to find a measure to improve the interfacial thermal transfer of graphene/silicon heterojunction. Through molecular dynamics simulation, it is found that surface modification can significantly reduce the thermal resistance, thereby improving the thermal conductivity of the graphene/silicon interface.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Qiong Wu, Yancheng Wang, Haonan Zhou, Xingye Qiu, Deqing Mei
Summary: This article introduces a visible methanol steam reforming microreactor, which uses an optical crystal as an observation window and measures the reaction temperature in real-time using infrared thermography. The results show that under lower oxygen to carbon ratio conditions, the microreactor has a higher heating rate and a stable gradient in temperature distribution.
APPLIED THERMAL ENGINEERING
(2024)
Review
Thermodynamics
Giulia Manco, Umberto Tesio, Elisa Guelpa, Vittorio Verda
Summary: In the past decade, there has been a growing interest in studying energy systems for the combined management of power vectors. Most of the published works focus on finding the optimal design and operations of Multi Energy Systems (MES). However, for newcomers to this field, understanding how to achieve the desired optimization details while controlling computational expenses can be challenging and time-consuming. This paper presents a novel approach to analyzing the existing literature on MES, with the aim of guiding practical development of MES optimization. Through the discussion of six case studies, the authors provide a mathematical formulation as a reference for building the model and emphasize the impact of different aspects on the problem nature and solver selection. In addition, the paper also discusses the different approaches used in the literature for incorporating thermal networks and storage in the optimization of multi-energy systems.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xuepeng Yuan, Caiman Yan, Yunxian Huang, Yong Tang, Shiwei Zhang, Gong Chen
Summary: In this study, a multi-scale microgroove wick (MSMGW) was developed by laser irradiation, which demonstrated superior capillary performance. The surface morphology and performance of the wick were affected by laser scan pitch, laser power, repetition frequency, and scanning speed. The MSMGW showed optimal capillary performance in alumina material and DI water as the working fluid.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Maofei Mei, Feng Hu, Chong Han
Summary: This paper proposes an effective local search method based on detection of droplet boundaries for understanding the dynamic process of droplet growth during dropwise condensation. The method is validated by comparing with experimental data. The present simulation provides an effective approach to more accurately predict the nucleation site density in future studies.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Rahul Kumar Sharma, Ashish Kumar, Dibakar Rakshit
Summary: The study explores the use of phase change materials (PCM) as a retrofit with Heating Ventilation and Air-conditioning systems (HVAC) to reduce energy consumption and improve air quality. By incorporating PCM with specific thickness and fin configurations, significant energy savings can be achieved in comparison to standard HVAC systems utilizing R134a. This research provides policymakers with energy-efficient and sustainable solutions for HVAC systems to combat climate change.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Zhenhua Ren, Xiangjin Meng, Xingang Qi, Hui Jin, Yunan Chen, Bin Chen, Liejin Guo
Summary: This paper investigates the heat transfer mechanism and factors influencing thermal radiation in the process of supercritical water gasification (SCWG) of coal, and proposes a comprehensive numerical model to simulate the process. Experimental validation results show that thermal radiation accounts for a significant proportion of the total heat exchange in the reactor and a large amount of radiant energy exists in the important spectral range of supercritical water. Enhancing radiative heat transfer can effectively increase the temperature of the reaction medium and the gasification rate.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Mauro Abela, Mauro Mameli, Sauro Filippeschi, Brent S. Taft
Summary: Pulsating Heat Pipes (PHP) are passive two-phase heat transfer devices with a simple structure and high heat transfer capabilities. The actual unpredictability of their dynamic behavior during startup and thermal crisis hinders their large-scale application. An experimental apparatus is designed to investigate these phenomena systematically. The results show that increasing the number of evaporator sections and condenser temperature improves the performance of PHP. The condenser temperature also affects the initial liquid phase distribution and startup time.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Ke Gan, Ruilian Li, Yi Zheng, Hui Xu, Ying Gao, Jiajie Qian, Ziming Wei, Bin Kong, Hong Zhang
Summary: A 3-dimensional enhanced heat pipe radiator has been developed to improve heat dissipation and temperature uniformity in cooling high-power electronic components. Experimental results show that the radiator has superior heat transfer performance compared to a conventional aluminum fin radiator under different heating powers and wind speed conditions.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xinyi Zhang, Shuzhong Wang, Daihui Jiang, Zhiqiang Wu
Summary: This study focuses on recovering waste heat from blast furnace slag using dry centrifugal pelletizing technology. A comprehensive two-dimensional model was developed to analyze heat transfer dynamics and investigate factors influencing heat exchange efficiency. The findings have important implications for optimizing waste heat recovery and ensuring safe operations.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xincheng Wu, An Zou, Qiang Zhang, Zhaoguang Wang
Summary: The boosting heat generation rate of high-performance processors is challenging traditional cooling techniques. This study proposes a combined design of active jet intermittency and passive surface modification to enhance heat transfer.
APPLIED THERMAL ENGINEERING
(2024)