Article
Energy & Fuels
Peng Wang, Zhilong Hu, Lei Shi, Xuyang Tang, Yang Liu, Kangyao Deng
Summary: By adjusting the Miller timing and two-stage turbocharging system, the performance, energy efficiency and emissions of marine diesel engines can be improved. This leads to a reduction in emissions and an increase in overall efficiency within a certain range.
Article
Thermodynamics
D. Di Battista, M. Di Bartolomeo, R. Cipollone
Summary: Energy recovery from exhaust gases is an important solution for sustainable propulsion, with the ability to transform thermal energy into electrical energy. The study tested a turbocharged diesel engine equipped with a variable geometry turbine to assess the maximum recoverable energy, demonstrating a reduction in specific fuel consumption of approximately 5-7% at medium-low operating regions.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Chemistry, Physical
Hadi Taghavifar, Arash Nemati, F. J. Salvador, J. De la Morena
Summary: The research proposes a reactivity controlled compression ignition (RCCI) turbocharger-assisted engine that operates with diesel hydrogen fuels. The study evaluates the effects of various parameters on engine performance and analyzes the impact of design variables on exergetic performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Peng Wang, Xuyang Tang, Lei Shi, Xinmin Ni, Zhilong Hu, Kangyao Deng
Summary: The combination of Miller cycle with EGR can improve the performance of a diesel engine, reduce emissions, and enhance fuel economy and opacity performance, especially at medium load conditions.
Article
Thermodynamics
Seungju Baek, Hyeonjik Lee, Kihyung Lee
Summary: This study found that the electric supercharger can significantly improve the low-speed efficiency and torque of internal combustion engines, but may increase friction and pumping losses under various operating conditions. It also improved fuel efficiency and reduced carbon dioxide emissions, but particulate matter and nitrogen oxide emissions still fluctuated.
Article
Thermodynamics
Mustafa Ertunc Tat, Oguzhan Hosgor
Summary: Heavy-duty diesel engines are essential for transportation and consume large amounts of fuel, resulting in substantial emissions. However, their performance and efficiency data are limited. This study analyzed a 16-cylinder diesel engine and found potential improvements in efficiency with different techniques.
Article
Chemistry, Multidisciplinary
Chandrabhushan Tiwari, Tikendra Nath Verma, Gaurav Dwivedi, Puneet Verma
Summary: Renewable energy is gaining more attention due to the depletion of fossil fuel reserves. In this study, Spirulina microalgae were used as feedstock for biodiesel production. Energy and exergy analysis were conducted on a diesel engine using different fuel blends. The results showed that the exergy efficiency of pure diesel was higher than that of biodiesel blends. The study also found that the engine's sustainability index was associated with exergy efficiencies.
APPLIED SCIENCES-BASEL
(2023)
Article
Green & Sustainable Science & Technology
Saket Kumar, Raghvendra Gautam
Summary: Exergy-energy analysis of biodiesel and baseline diesel was compared at various engine design variables to determine optimal operating conditions for efficient combustion of B20 blend fuel. The results showed that energy efficiency was 31.69% at a compression ratio of 17.5 and injection pressure of 210 bar, with the maximum efficiency observed for diesel at 32.67%. Based on the data analysis, it is suggested that B20 tallow-based biodiesel can be used as an efficient and sustainable fuel.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2023)
Article
Energy & Fuels
Dawei Wang, Heng Zhang, Yuehua Qian, Kangyao Deng
Summary: This study fills the gap by focusing on energy and exergy analysis to improve the deterioration of fuel economy caused by EGR. Results show that reducing irreversibility will be more efficient, and suggest methods to reduce temperature gradient and proportion of premixed combustion.
Article
Green & Sustainable Science & Technology
V Praveena, M. Leenus Jesu Martin, Edwin Geo Varuvel
Summary: This experimental work addresses the challenges of waste management by converting biomass waste into useful fuel for internal combustion engines. The study analyzes the effects of different piston shapes and nozzle profiles on the energy and exergy rates of an engine running on grapeseed oil methyl ester blended with cerium oxide nano particles. The results show that adjusting the nozzle shape and hole number can improve the energy efficiency and exergetic efficiency of the engine, while reducing exhaust emissions.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Thermodynamics
M. Gowthama Krishnan, Sundararajan Rajkumar
Summary: This experimental study investigates the effects of dual fuel combustion of isobutanol on the performance, emission, and energy-exergy characteristics of an off-road diesel engine. The results show that the dual fuel combustion of isobutanol can improve the thermal efficiency and reduce the emissions of carbon monoxide and nitrogen oxides. Additionally, at a certain premixed energy ratio, the dual fuel combustion of B20 isobutanol has a positive effect on improving the energy-exergy efficiency.
Article
Thermodynamics
Senthilkumar Gnanamani, Pradeep Uttam Gaikwad, Lakshmisankar Subramaniam, Rameshkumar Chandralingam
Summary: This study investigates the importance of exergy analysis in Diesel engine performance. Experiments were conducted using diesel and cotton seed oil blends, and the results show that the use of cotton seed oil blends can reduce exergy loss and thermal exergy loss compared to diesel fuel.
Article
Engineering, Chemical
Heng Zhang, Wuqiang Long, Ge Xiao, Jiangping Tian, Bo Li, Dawei Wang, Yuehua Qian
Summary: By delaying the exhaust valve closing and implementing an appropriate injection strategy, the fuel consumption and NOx emissions of marine low-speed diesel engines can be improved. Energy analysis reveals that exhaust gas and heat transfer losses account for half of the total energy. However, exergy analysis shows that the irreversibility caused by combustion is the largest contributor.
Article
Thermodynamics
Yong-hui Duan, Bai-gang Sun, Qian Li, Xue-song Wu, Tie-gang Hu, Qing-he Luo
Summary: This study aims to comprehensively investigate the combustion characteristics of turbocharged direct injection hydrogen internal combustion engines and optimize their performance. The research reveals that turbocharged direct injection hydrogen internal combustion engines have higher maximum pressure rise rate and longer burning duration, which can be applied to the design and development of related fields.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Thermodynamics
Juan Zapata-Mina, Alvaro Restrepo, Juan Esteban Tibaquira
Summary: This study evaluated the performance of low glyceride palm oil biodiesel blended with diesel fuel in a compression ignition engine through experimental analysis of exergy, emissions, and combustion characteristics. The results showed that higher concentrations of CO and CO2 were obtained for B10, while lower concentrations of NOx were found for B20 and B50. Increasing the fuel blend improved the combustion process by enhancing premixed burning and reducing diffuse burning. Decreasing the glyceride content in biodiesel resulted in adequate performance, significant emission reduction, and homogeneous combustion when blended with conventional diesel.
CASE STUDIES IN 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)