Article
Thermodynamics
Mohd Asjad Siddiqui, Abdul Khaliq, Rajesh Kumar
Summary: A novel combined power and cooling cycle involving ERC and ORC was proposed to enhance the efficiency of a wet-ethanol fuelled HCCI engine. Simulation and analysis showed improved performance under certain operating conditions with different working fluids.
Article
Thermodynamics
Mohd Asjad Siddiqui, Abdul Khaliq, Rajesh Kumar
Summary: This study proposes a combined cycle with a wet ethanol-fueled and turbocharged HCCI engine coupled to an ejector refrigeration cycle and an absorption refrigeration cycle, which can generate both power and refrigeration simultaneously. A thermodynamic model is developed using the first and second laws of thermodynamics to investigate the performance of the combined cycle, and the performance of the combined cycle is compared between the ejector refrigeration cycle and the absorption refrigeration cycle by varying operating parameters. The results show that increasing the turbocharger pressure enhances HCCI engine power and refrigeration load, while increasing the ambient temperature decreases HCCI engine efficiencies and energy efficiency of cogeneration.
JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS
(2022)
Article
Thermodynamics
Luis Silva-Llanca, Sebastian Inostroza-Lagos
Summary: Vertical Axis Wind Turbines have emerged as a viable complement to conventional wind turbines, being more suitable for urban and remote areas. By utilizing the Second Law of Thermodynamics, a better understanding of fluid dynamics phenomena can be achieved, with the Second Law Efficiency maximizing at an intermediate Tip Speed Ratio for more efficient power generation.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Thermodynamics
Juan Zapata-Mina, Seyed Mohammad Safieddin Ardebili, Alvaro Restrepo, Hamit Solmaz, Alper Calam, Ozer Can
Summary: This study investigates the performance of an HCCI engine operated with various fuel ratios and lambda values. The results show that the highest engine efficiency is achieved when using a blend of 40% diethyl ether and 60% fusel oil (D40F60) at a lambda between 2.1 and 2.2. However, increasing the amount of diethyl ether in the blend decreases the performance of the HCCI engine. Operating with a blend of 80% diethyl ether and 20% fusel oil (D80F20) also provides better stability of performance.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Engineering, Chemical
Mehdi Bahiraei, Nima Mazaheri
Summary: The study focuses on the second law attributes of a counter-flow spiral heat exchanger with an Al2O3-H2O nanofluid, showing that dispersing more nanoparticles can reduce total entropy generation while increasing thermal entropy generation. Overall exergy destruction in the heat exchanger decreases significantly with increasing volume fraction, but tends to increase with flow rate increment. The second law efficiency of the heat exchanger is consistently high, with a minimum value greater than 0.84 and increasing with higher volume fraction or flow rate.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Chemistry, Physical
Mohit Raj Saxena, Rakesh Kumar Maurya
Summary: This study investigates the syngas fuelled homogeneous charge compression ignition (HCCI) engine through parametric investigation. The chemical kinetic simulation using the stochastic reactor model (SRM) compares and evaluates different reaction mechanisms. The validated reaction mechanism is further used to study the HCCI engine at different engine speeds, equivalence ratios, syngas compositions, and inlet valve closing temperatures.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Thermodynamics
Alessandro J. T. B. de Lima, Waldyr L. R. Gallo
Summary: This study investigates the potential of wet ethanol as a fuel for engines by looking into the early injection of different blends of wet ethanol. The results showed that high efficiencies can be achieved with certain blends, highlighting the potential of wet ethanol for DI engines.
APPLIED THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Ammar Mansour A. Alalo, Meisam Babaie, Alireza Shirneshan, Timothy A. Bodisco, Zoran D. Ristovski, Richard J. Brown, Ali Zare
Summary: This study investigates the impact of engine temperature on energy and exergy parameters during engine warm-up. The results show that as the engine warms up, fuel exergy, exhaust heat losses, and exergy destruction decrease, while exhaust exergy loss increases. In addition, the warm-up period also leads to a decrease in FMEP and BSFC, and an increase in BTE and exergetic efficiency.
Article
Energy & Fuels
Ibham Veza, Irianto, Anh Tuan Hoang, Abdulfatah A. Yusuf, Safarudin G. Herawan, M. E. M. Soudagar, Olusegun D. Samuel, M. F. M. Said, Arridina S. Silitonga
Summary: The addition of acetone-butanol-ethanol (ABE) as a fuel can decrease CO2 and NOx emissions in an HCCI-DI engine, but has no significant effect on HC, CO, PM, and soot emissions. Furthermore, engine performance is improved with the addition of ABE.
Article
Thermodynamics
Aneesh Vijay Kale, Anand Krishnasamy
Summary: This study investigates the limitations of homogeneous charge compression ignition (HCCI) in a light-duty diesel engine using isopropanol-gasoline blends. By adding 2-ethylhexyl nitrate (2-EHN) as a cetane booster additive, the lower load limits of HCCI were broadened, and the HCCI with isopropanol-gasoline blends showed significant reductions in energy consumption, nitrogen oxides (NOx), and soot emissions compared to conventional diesel combustion (CDC), especially at higher loads. Exergy analysis demonstrated that the second law efficiency of HCCI improved with increased isopropanol content in the test fuels at a specific load. Overall, the results suggest that isopropanol-gasoline blends are viable alternatives to diesel for operating HCCI engines that meet emission and performance targets.
Article
Energy & Fuels
Muhammad Faizullizam Roslan, Ibham Veza, Mohd Farid Muhamad Said
Summary: This study aims to explore the potential of ABE fuel in HCCI-DI engines and investigate the impact of other parameters on its performance. The results show that increasing the proportion of ABE can reduce fuel consumption and improve the engine's thermal efficiency. Additionally, using ABE can significantly reduce NOx emissions. In conclusion, ABE fuel is renewable and capable of reducing emissions without compromising engine performance in HCCI-DI engines.
Article
Thermodynamics
Hakan Aygun, Mehmet Kirmizi, Onder Turan
Summary: This study examines the effects of propeller efficiency on the energetic, exergetic, environmental, and sustainability indicators of a small turboprop engine at sea level. The results show that small changes in design variables have an impact on the engine's energetic and exergetic performance.
Article
Thermodynamics
Beichuan Hong, Andreas Lius, Senthil Krishnan Mahendar, Mihai Mihaescu, Andreas Cronhjort
Summary: This study provides a deeper understanding of the high-load performance of an ethanol-fueled heavy-duty SI engine using lean-burn combustion. Experimental results show that the thermal efficiency of ethanol fuel significantly increases under excess air ratios higher than 1.8, while combustion losses increase. The challenging requirements to achieve lean-burn combustion with lower exhaust gas temperatures and higher intake boost pressures are assessed through an exergy analysis of the turbocharging system.
APPLIED THERMAL ENGINEERING
(2023)
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
Green & Sustainable Science & Technology
Mansoor Abdul Aziz, Jie Lin, Frantisek Miksik, Takahiko Miyazaki, Kyaw Thu
Summary: Humidification-dehumidification desalination (HDD) systems are a viable method for producing fresh water in inaccessible areas. This paper proposes an open air open water HDD system that utilizes the Maisotsenko cycle and solar energy. The model is validated and analyzed, showing that raising the inlet air temperature improves system performance.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
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)