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
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
Xiaoyu Zhang, Fengzhong Sun, Xuehong Chen, Weipeng Deng, Kun Chen
Summary: This study analyzes the impact of the layout pattern of chip mufflers on the cooling performance of a super large-scale cooling tower. The results show that chip mufflers can enhance the cooling performance by improving airflow uniformity.
APPLIED THERMAL ENGINEERING
(2022)
Article
Engineering, Civil
Tiantian Liu, Jucheng Wang, Tianyi Song, Suoying He, Jianwei Zhan, Zhe Geng, Shuzhen Zhang, Xiang Huang, Jianhui Qi, Ming Gao, Yuetao Shi
Summary: Spray pre-cooling technology effectively enhances the thermal performance of natural draft dry cooling towers (NDDCT) during high temperature periods. This study investigates the impact of different nozzle arrangement spray strategies with low water consumption on the thermal performance of NDDCT under typical crosswind conditions (4 m/s). A 3-D model of a 120 m high NDDCT pre-cooled with nozzle spray was developed and various spray strategies were extensively studied. The results demonstrate that all spray strategies, both incompletely and fully saturating the tower airflow, improve the thermal performance of the NDDCT.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(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
Thermodynamics
Liang Zhang, Xiaoxiao Li, Jinxiao Zhou, Yuanyuan Yu, Junjie Feng
Summary: This study investigates the impact of crosswind effect from natural draft cooling system on the cooling tower. The results show that the characteristic parameters of the cooling tower vary significantly with the turbulence of the crosswind.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Energy & Fuels
Weipeng Deng, Fengzhong Sun
Summary: The study proposes the use of a stepped fill layout to enhance the cooling capacity of a single air inlet induced draft cooling tower. Results show that the cooling capacity of the tower with stepped fill is superior to that with uniform fill under different crosswind velocities and angles.
Article
Thermodynamics
Yuchen Dai, Yuanshen Lu, Alexander Y. Klimenko, Ying Wang, Kamel Hooman
Summary: The study investigated the swirl effects on short natural draft dry cooling towers, finding that introducing swirls above the heat exchangers improved thermal performance by 40% without wind, and by 17% with increased swirl intensity at the tower outlet. The presence of crosswind and windbreak walls led to non-uniform air flows through the tower, but mounting the swirl generator above the heat exchangers improved heat flux uniformity by 5% with 1 s(-1) angular frequency input, while inducing swirls at the tower outlet remained optimal for increasing air draft speed and enhancing thermal performance by 11 to 17% depending on crosswind speed.
APPLIED THERMAL ENGINEERING
(2021)
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
Huimin Pang, Mingwei Wang, Qi Gao, Shen Cheng, Zhilan Liu, Zhe Geng, Shuzhen Zhang, Suoying He, Tiantian Liu, Cuilin Zhao, Wangrui Liu, Ming Gao
Summary: In this study, a 3-D model was established using Fluent 16.2 to investigate the spray zones of a 120 m high natural draft dry cooling tower (NDDCT) under crosswind conditions. The results show that the nozzle height should be set at 7 m for a crosswind speed of 0 m/s, and 9 m for crosswind speeds of 2-10 m/s. The feasible spray angles of the nozzles are 0 degrees for crosswind speeds of 0-4 m/s, and 90 degrees for crosswind speeds of 6-10 m/s. The feasible nozzle radiuses also vary under different crosswind conditions.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2023)
Article
Thermodynamics
Weipeng Deng, Fengzhong Sun, Kun Chen, Xiaoyu Zhang
Summary: This study proposes increasing the height of the fan duct to reduce air recirculation and reconstructing the aerodynamic field to improve the cooling capacity of the wet cooling tower group. Numerical results show significant reduction in air recirculation rate and increased water temperature drop after the retrofit.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Xuehong Chen, Fengzhong Sun, Shasha Yang, Lijiang Xia, Xiaoyu Zhang
Summary: This study proposes a simple structural wind shield to mitigate the adverse effect of environmental crosswind on the thermal performance of cooling towers. Numerical investigations demonstrate that the wind shield can eliminate vortices and improve the distribution of airflow velocity and water temperature. The thermal performance of the cooling towers is significantly improved when the crosswind angle exceeds 45 degrees.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Xuehong Chen, Fengzhong Sun, Lijiang Xia, Xu Song, Xiaoyu Zhang
Summary: Auxiliary ventilation is an innovative approach to enhance the thermal performance of natural draft wet cooling towers. This study establishes a three-dimensional numerical model for cooling towers with internal and external fans, considering the presence or absence of air deflectors. The study compares the thermal performance of these cooling towers by computing critical parameters, such as air mass flow rate and circulating water temperature drop, and investigating the airflow and water temperature field.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(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, 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
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)