Article
Thermodynamics
Huan Ma, Liang Cai, Fengqi Si
Summary: A 3D numerical model was developed to evaluate the synergy between the air precooling effect and windbreak-like effect of moist media with varied interval angles. The results indicate that the air precooling effect is enhanced with wind speed, but the windbreak-like effect of the moist media declines after wind speed exceeds 8 m/s. The air precooling effect is stronger than the windbreak-like effect at low and ultrahigh wind speeds.
APPLIED THERMAL ENGINEERING
(2022)
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
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
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: 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
Energy & Fuels
Zhao Li, Huimin Wei, Tao Wu, Xiaoze Du
Summary: The study improved the performance of an indirect dry cooling system by redistributing circulating cooling water and optimizing its operation strategies under different crosswind speeds, especially showing significant enhancements under high wind speeds. Additionally, there was a slight increase in coal savings with rising ambient temperatures.
Article
Thermodynamics
Yuanbin Zhao, Qian Zhao, Fei Li, Qinghe Liang, Xuan Li, Yasi Chen
Summary: This study investigates the effect mechanisms of aerodynamic field equalizing, or air equalizing, on the cooling delta's heat transfer capabilities in large-scale natural draft dry cooling towers (NDDCT). By analyzing the aerodynamic fields, air flow rates, and water temperature in the cooling columns composing deltas, the study finds that air equalizing can improve the cooling characteristics of the poorer performing columns mostly at the delta's leeward, but deteriorate those of the better-performing columns mostly at the delta's windward. However, with air equalizing, the cooling characteristics of the two columns in one delta are balanced, resulting in improved cooling characteristics for most deltas and the whole NDDCT at varying crosswind speeds. This study is significant for the design optimization of conventional delta-type radiators.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Huan Ma, Ningning Cai, Liang Cai, Fengqi Si
Summary: Auxiliary forced convection induced by axial flow fans was introduced to improve the ventilation and heat dissipation of a large-scale dry cooling tower under crosswinds. By altering fan layout position, compactness, and inclination, the induced effects on thermal performance of the indirect dry cooling system were studied. The results showed that the best fan layout is horizontally arranged on the inlet cross-section of the tower body when the wind speed is below 6 m/s.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Mechanics
Lin Li, Cunliang Liu, Wei Li, Wenbin Chen, Huiren Zhu, Weijiang Xu
Summary: This study uses computational fluid dynamics-discrete element method to simulate the particle transport and deposition in the internal cooling channel of turbine blades. The unsteady development process of particle transport and deposition with increasing injection particle mass is obtained, and the influence of jets Reynolds number, particle Stokes number, and initial particle volume fraction on the particle deposition characteristics is presented. The particle deposition mechanism in the impingement-film cooling passage of turbine blades is revealed. The results show the formation of conical-shaped and banded-shaped particle deposition layers, and the impact of jets Reynolds number and particle Stokes number on the particle deposition behavior.
Article
Thermodynamics
Huan Ma, Liang Cai, Fengqi Si, Junshan Wang
Summary: Introducing moist media into a natural draft dry cooling tower can effectively increase the cooling capacity, especially under higher wind speeds. Optimizing air inflow field and introducing pre-cooled air can improve tower performance and enhance the thermo-flow characteristics of the radiators.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
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
Chemistry, Multidisciplinary
Pengli Li, Ao Wang, Junjie Fan, Qi Kang, Pingkai Jiang, Hua Bao, Xingyi Huang
Summary: Radiative cooling is a promising passive cooling technology that reflects sunlight and emits heat to deep space without any energy consumption. Current research focuses on cooling non-heat-generating objects, but a scalable photonic film has been developed that can provide subambient cooling performance under direct sunlight and above-ambient cooling performance at night. This innovative film breaks the trade-off between optical reflection and thermal dissipation, providing a new strategy for applications related to light management.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Thermodynamics
Jichong Yang, Zhenguo Jia, Hongjun Guan, Suoying He, Ming Gao
Summary: A three-dimensional numerical model is established for a super-large wet cooling tower, and verified for three different pitches fillings. The research finds the relatively optimal fillings layout and analyzes their influence on the performance of the wet cooling tower under windless and crosswind conditions. The findings show that three different pitches fillings can improve the distribution of air dynamic and temperature fields inside the tower.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Mehran Shirazi, Ali Jahangiri
Summary: The study introduced three novel internal windbreak walls to enhance the performance of Natural draft dry cooling towers, utilizing CFD methods to investigate different models' effects. The efficiency was improved by 7.5% at a crosswind velocity of 10 m/s.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2021)
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
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)