Article
Thermodynamics
Saeed Faghih, Alireza Pourshaghaghy
Summary: This study presents the best thermodynamic conditions and optimal working fluids for the Organic Rankine cycle (ORC) to generate electricity from high-temperature gas. The optimization was carried out using a genetic algorithm, and the results showed the optimal fluids for different temperature ranges of the heat sources. Additionally, environmental issues and flammability were considered in selecting the best working fluids.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Xinxin Zhang, Yin Zhang, Jingfu Wang
Summary: This paper investigates the impact of circulation pump on the development of small-scale Organic Rankine Cycle system. It proposes models using trapezoid and triangle to represent power consumption and degree of subcooling, analyses the optimal condensation temperature of 69 working fluids and the deviation between real and ideal gas behavior, determines the optimal condensation temperature for each working fluid, discusses the applicability of working fluids in Organic Rankine Cycle from the perspective of pump performance.
APPLIED THERMAL ENGINEERING
(2021)
Review
Energy & Fuels
Erguang Huo, Liyong Xin, Shukun Wang
Summary: Organic Rankine cycle is an effective method to convert renewable energy and waste heat into electricity. Thermal stability of working fluids is crucial for the design and selection of ORC systems, and this review focuses on thermal stability studies of different types of working fluids and their impact on ORC performance and safety. It also discusses the research methods and current status of working fluid pyrolysis mechanism, as well as the potential of density functional theory and ReaxFF force field in studying this mechanism.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Thermodynamics
Xinxin Zhang, Yang Li
Summary: This paper examines the use of super dry working fluids in regenerative ORC and determines the optimal extraction pressure and temperature for each fluid based on different heat sources. The results indicate that heptane is the best match for closed heat sources, while pentane, hexane, propylcyclohexane, undecane, and o-xylene are suitable for different open heat sources.
Article
Thermodynamics
Hong-Hu Zhang, Ming-Jia Li, Yong-Qiang Feng, Huan Xi, Tzu-Chen Hung
Summary: The feasibility of the combined steam Rankine cycle-Organic Rankine cycle system was investigated and verified through comparing and screening different working fluids. It was found that the addition of a regenerator can effectively improve the NPI of the ORC system. The combined system using ammonia and R600 as working fluid showed the largest NPI values.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Qingfen Ma, Zezhou Gao, Jie Huang, Omid Mahian, Xin Feng, Hui Lu, Shenghui Wang, Chengpeng Wang, Rongnian Tang, Jingru Li
Summary: This study analyzes the performance of an ocean thermal energy conversion (OTEC) plant using an organic Rankine cycle (ORC) with a theoretical outpower of 100 kW. Hydrofluoroolefins (HFOs) are selected as the components of the binary non-azeotropic working fluid due to their desired thermodynamic properties, higher safety and stability, lower cost and environmental friendliness. The results show that using a binary mixture of R1224yd(Z)/R1243zf as the working fluid in the ORC is a promising alternative to pure NH3.
Article
Green & Sustainable Science & Technology
Weicong Xu, Ruikai Zhao, Shuai Deng, Li Zhao, Samuel S. Mao
Summary: The development of zeotropic working fluids has provided new opportunities to improve the performance of ORC technology, but challenges remain in theory and application that need to be addressed.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Thermodynamics
Fufang Yang, Fubin Yang, Qiang Liu, Qingfu Chu, Zhen Yang, Yuanyuan Duan
Summary: This study further develops the analysis framework for thermodynamic performance limits of sub- and trans-critical ORCs, and determines the optimal working fluid and system operation conditions through parameter optimization. The results provide valuable insights for working fluid selection in ORC research and implementation.
Article
Thermodynamics
Liuchen Liu, Guomin Cui, Christoph Wieland, Hartmut Spliethoff
Summary: Mass-based analysis is an effective method to investigate the performance of ORC systems using zeotropic fluid mixture. The study focuses on evaporator and condenser, and reveals that liquid-phase zones account for about 60% of total mass in both heat ex-changers. The relationship between initial charge and composition shift is also analyzed, showing that an increase in total mass leads to a decrease in mass in two-phase zones and an increase in mass in single-phase zones, resulting in a reduction of the average composition shift. The highest net output work is achieved when the initial working fluid charge rises to 130% of the design value.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Tianbiao He, Huigang Ma, Jie Ma, Ning Mao, Zuming Liu
Summary: The study investigated the impact of different factors on the performance of cryogenic organic Rankine cycle (ORC) systems, highlighting the significant influence of LNG vaporization pressure. Using R1270 and C2H6 as binary working fluids can significantly improve system performance.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Thermodynamics
Zhixin Sun, Qiang Zhao, Zhenquan Wu, Kui Lin
Summary: This study evaluates different configurations of Rankine cycles and finds that improved single-stage RCs are generally better than two-stage RCs, with regenerative-reheat RC performing best under most working conditions. The choice of working fluid is crucial for the performance of different types of RC cycles, with variations in key parameters and optimization strategies for each.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Engineering, Chemical
Jianping Tang, Lixia Kang, Yongzhong Liu
Summary: This paper presents an effective method for the selection and design of optimal working fluids in organic Rankine cycle (ORC). The method utilizes quantitative working fluid selection rules to reduce complexity and improve calculation efficiency. By exploring and summarizing the critical properties of the optimal working fluids for given heat sources, and using the concept of working fluid substitution, the method determines the critical properties of the optimal pure working fluid and the component and composition of the optimal mixture working fluid.
Article
Energy & Fuels
Ladislao Eduardo Mendez-Cruz, Miguel Angel Gutierrez-Limon, Helen Lugo-Mendez, Raul Lugo-Leyte, Teresa Lopez-Arenas, Mauricio Sales-Cruz
Summary: The study of thermal systems that utilize residual thermal sources in power generation is crucial for minimizing environmental impact and promoting sustainable alternatives. The organic Rankine cycle (ORC) is particularly relevant as it can harness low-temperature residual energy sources. This work presents a methodology for evaluating the feasibility of using refrigerants as working fluids in an ORC based on an exergetic viability index. The results demonstrate that R245fa and R600a are the most viable refrigerants for the ORC at different condensing temperatures.
Article
Thermodynamics
Enhua Wang, Mengru Zhang, Fanxiao Meng, Hongguang Zhang
Summary: Organic Rankine cycle (ORC) is an effective method for utilizing low-grade energy. This study presents a method for improving the efficiency of a bottoming ORC with variable heat source temperature by selecting zeotropic mixtures. The effects of the marine engine's operation conditions and ambient temperature are investigated, and the optimal performances of pure working fluids and zeotropic mixtures are compared. It is found that using zeotropic mixtures can enhance the performance of the ORC over a range of operating conditions.
Article
Thermodynamics
Yinlian Yan, Fubin Yang, Hongguang Zhang, Yachao Pan, Xu Ping, Zhong Ge
Summary: This paper presents a systematic framework for evaluating working fluids in the Organic Rankine cycle (ORC) from a molecular structure perspective. The framework combines quantitative structure property relationship (QSPR) and universal equations of state to correlate thermodynamic performance with key thermophysical properties. By using QSPR models based on molecular structure, the influence factors of ORC performance at a micro level are investigated and the effects of molecular characteristics on thermal efficiency are analyzed. The proposed framework demonstrates sufficient accuracy compared to results based on REFPROP, and provides new insights for the evaluation, selection, and design of working fluids based on molecular structure.
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)