Review
Energy & Fuels
Pradeep Arjunan, Joselin Herbert Gnana Muthu, Suresh Lal Somanasari Radha, Abhilash Suryan
Summary: The performance of renewable energy systems can be significantly improved by utilizing low-temperature heat sources for power generation. The organic Rankine cycle (ORC) is suitable for this purpose and finds applications alongside solar power, geothermal power, waste heat, and biomass. ORC systems contribute to raising the effectiveness of renewable power sources and enable power generation at lower temperatures, such as on cloudy days. The main difference between ORC and the steam Rankine cycle lies in the working fluid used, with ORC using organic fluids and working at lower temperatures and pressure than the steam Rankine cycle.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Thermodynamics
Qi'an Zhu, Yuling Zhai, Hua Wang, Zhouhang Li
Summary: This study investigates the influence of vapor generator design on both component and system levels in transcritical organic Rankine cycles. Two design models are used, and the results show that there are significant differences in the size of the vapor generator between the two models, but only a small change in system electricity production cost.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Green & Sustainable Science & Technology
Zhanying Zheng, Xiaoqiang Hong, Wei Wu, Yong-qiang Feng, Michael K. H. Leung
Summary: The presence of moisture in industrial exhaust gases can significantly increase the net power output of thermodynamic cycles used for electricity generation. In particular, the dual-pressure organic Rankine cycle shows the most convincing performance enhancement when compared to a simple organic Rankine cycle.
JOURNAL OF CLEANER PRODUCTION
(2022)
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
Engineering, Chemical
Chao Wang, Yu Zhuang, Mengting Song, Linlin Liu, Yachao Dong, Lei Zhang, Jian Du
Summary: Reaction and distillation separation processes often generate a large amount of waste heat, and recovering this waste heat can greatly improve the economic performance of these processes. In this study, waste heat recovery using the organic Rankine cycle (ORC) system with different working fluids was investigated in the context of cumene synthesis process. The results showed that utilizing waste heat from both the reaction and distillation sections can lead to positive net economic revenues (NER), and the use of certain working fluids, such as R601, can maximize the NER and thermodynamic efficiency (eta) of the ORC system.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Thermodynamics
A. Habibollahzade, K. J. Petersen, M. Aliahmadi, I Fakhari, J. R. Brinkerhoff
Summary: The study found that transcritical-CO2 systems can generate the highest power and have a levelized cost of electricity ranging from 0.12 to 0.16 $/kWh. Additionally, transcritical-CO2 configurations have the lowest payback period and achieve the highest efficiencies.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Thermodynamics
Sooraj Mohan, P. Dinesha, Pietro Elia Campana
Summary: In this study, a design of experiments approach and artificial neural network modeling were used to optimize the working fluid selection for organic Rankine cycle (ORC), resulting in the identification of the optimal working fluid and its corresponding performance.
Article
Thermodynamics
Noureddine Toujani, Nahla Bouaziz, Lakder Kairouani
Summary: The purpose of this study is to analyze the performance of a new system that combines organic Rankine Cycle (ORC) and vapor compression refrigeration cycle (VCRC) for refrigeration and cogeneration. The study develops a new system architecture and explores different heat recovery configurations, and finds the optimal system combination through energy analysis and comparison of different working fluids.
JOURNAL OF THERMAL SCIENCE
(2022)
Article
Thermodynamics
Xiaoxia Xia, Zhipeng Liu, Zhiqi Wang, Tong Sun, Hualong Zhang
Summary: In this study, a multi-layer performance optimization method is used to optimize the ORC-VCR system. Firstly, parametric analysis and multi-objective optimization are conducted in operation parameter layer optimization, considering thermodynamic, economic and environmental performance. Then, working fluid selection under different heat source temperature is performed in working fluid layer optimization based on the results of multi-objective optimization. Finally, the optimal heat source temperature for all working fluids is determined in heat source layer optimization. The results show that the increase of heat source temperature leads to an increase in the generation temperature and condensation temperature of the optimal solution, while the evaporation temperature remains concentrated on the lower limit. The COP nearly remains the same, while NPV and AER continuously increase. Among the candidate working fluids, HCs have the best comprehensive performance and R602 is almost the optimal working fluid under all heat resource temperature. The optimal heat source temperature for all working fluids is concentrated on high-temperature region. The multi-layer performance optimization method provides a novel idea for improving comprehensive system performance.
Article
Thermodynamics
Conghui Gu, Yujian Zhang, Chunli Tang, Oshkin Vladislav Olegovich, Kasolongo Ndongo Gloria
Summary: In this paper, a new numerical optimization algorithm is proposed to simultaneously optimize the components and operating parameters of the organic Rankine cycle. By applying it to single-stage and two-stage organic Rankine cycles, the optimization effect of the proposed numerical method can reach over 99.99% of the optimal effect, compared to the Nested method. Additionally, the optimization time is significantly decreased. After considering the working medium, the best performance reaches 99.52%. The results suggest that the optimization effect of the system decreases slowly as the complexity of the system and the number of independent variables increase. Compared to previous publications, the overall performance is improved by 1.68% with the new numerical optimization algorithm.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Lukasz Witanowski, Piotr Klonowicz, Piotr Lampart, Pawel Ziolkowaki
Summary: This paper focuses on the multi-objective efficiency optimization of a one-stage axial ORC turbine using an Implicit Filtering algorithm. The efficiency is improved in both modes of operation by changing the rotor profiles and the shape of endwall contours of the rotor domain.
Article
Green & Sustainable Science & Technology
Victor Manuel Garcia-Anteportalatina, Mariano Martin
Summary: The increasing demand for power and the need to reduce dependency on fossil resources create an opportunity to convert low-to-medium grade heat streams into electricity. This study proposes a systematic approach to simultaneously select the thermodynamic cycle, configuration, thermal fluid, and optimal operating conditions. Results show that, for temperatures above 120 degrees C, the organic flash Rankine cycle using Benzene is the best configuration in terms of thermodynamic performance, while the organic Rankine cycle provides the most cost-effective electricity. For temperatures below 120 degrees C, the dual organic Rankine cycle using R227ea fluid shows the best performance and lower cost.
Article
Thermodynamics
Jinwen Cai, Hua Tian, Xuan Wang, Rui Wang, Gequn Shu, Mingtao Wang
Summary: The study presents a detailed calibration mechanism for the ORC dynamic model, which can capture the system's dynamic behavior well and achieve good predictions for key system state parameters. The findings enhance confidence in model application for similar thermodynamic systems.
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
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)