Article
Thermodynamics
Yunxiao Wang, Yanxing Zhao, Yuwei Sun, Haocheng Wang, Hao Guo, Maoqiong Gong
Summary: Mixed-refrigerant Joule-Thomson refrigeration is widely used and effective for refrigeration in the temperature range of 80-230 K. Optimizing the composition of the mixed refrigerant is essential for determining the refrigeration temperature and capacity. This study proposes an alternative optimization method based on the effective refrigeration effect to overcome challenges associated with complex algorithms typically used in optimizing mixed refrigerants.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Yunxiao Wang, Haocheng Wang, Yanxing Zhao, Maoqiong Gong, Kun Wang, Hao Guo
Summary: A mixed refrigerant optimization method based on the effective refrigeration effect is proposed in this study, which can be used for cooling distributed-temperature heat loads. By optimizing to make the equivalent enthalpy close to zero, the performance of the refrigeration cycle can be improved. In specific applications, this method has increased the exergy efficiencies in different systems.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2023)
Article
Thermodynamics
L. H. Geng, H. S. Cao, J. M. Li, P. X. Jiang
Summary: Ejectors and counter flow heat exchangers (CFHXs) are key components of JT cryocoolers, having significant effects on cryocooler performance. By optimizing the design of 1-D ejector and CFHXs models, higher system efficiencies and lower temperatures can be achieved.
APPLIED THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
Ji-Hoon Yoon, Jung-In Yoon, Chang-Hyo Son, Sung-Hoon Seol
Summary: This study proposes a precooler application in the cascade mixed refrigerant Joule-Thomson cycle, which reduces the capacity requirements of the high-temperature cycle by utilizing the temperature gradient characteristics of the non-azeotropic mixed refrigerant. Simulation analysis shows that under appropriate conditions, the capacity of each component in the system can be reduced by over 45%, leading to a maximum increase of 21.6% in the system's coefficient of performance. Furthermore, the exergy destruction in the system decreases with the reduction in component capacity, and the exergy efficiency can be increased by up to 47.4%.
Article
Thermodynamics
Haishan Cao, Qinghang Meng, Xin Tong, Chia-hsin Wang, Biqiang Liu, Xiaotao Wang
Summary: This study presents a miniature Joule-Thomson (JT) cold stage driven by a linear compressor, and investigates its performance operating with a ternary mixture of methane, ethane and neopentane. Experimental and numerical analyses were conducted to evaluate the cooler's capabilities. The results indicate that the cooler can achieve a cold-end temperature of 143 K and provide different net cooling powers at various temperatures.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Haishan Cao, Lihong Geng, Qinghang Meng, Junming Li, Peixue Jiang
Summary: This study experimentally and numerically investigates the effects of various factors on the performance of nitrogen ejectors in JT cooling cycles and provides recommendations for nitrogen ejector designs.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Giorgio Besagni, Nicolo Cristiani, Lorenzo Croci, Gael Raymond Guedon, Fabio Inzoli
Summary: This paper examines the complex relationships in ejector refrigeration systems, finding that different refrigerants perform differently under various geometries, which is crucial for enhancing efficiency and optimizing performance.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Cenker Aktemur, Ilhan Tekin Ozturk
Summary: For the first time, comprehensive thermodynamic analysis and optimization of a booster-assisted ejector expansion vapor compression refrigeration system with R152a/Cu nano-refrigerant are presented to reduce the high electrical energy requirement for low temperature applications. The use of nanoparticles in the system led to improvements such as decreased main compressor discharge temperature, reduced total exergy destruction rate, increased entrainment ratio, decreased ejector area ratio, decreased panel area, and increased coefficient of performance and exergy efficiency. The results of thermodynamic optimization provide useful guidance for system design and implementation.
APPLIED THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Guoji Tian, Chengming Zhao, Huifan Zheng, Xiaowei Fan
Summary: A bench performance test was conducted on a refrigerant pump to analyze parameter variations under different working conditions. The results showed that the outlet pressure, differential pressure, and power consumption increased with frequency, while the total efficiency initially increased and then decreased. Under specific conditions, the outlet pressure and differential pressure decreased with increasing flow rates, and the outlet pressure increased with increasing inlet pressures. The pump power consumption increased with flow and inlet pressure, and the total efficiency initially increased and then slightly declined with increasing flow rates.
Article
Thermodynamics
H. S. Cao, L. H. Geng, G. Hammink, T. Tirolien, H. J. M. ter Brake
Summary: This paper presents a miniature ejector with a nozzle throat diameter of 162 micrometers, measured using X-ray computed tomography, and investigates its performance under different operating conditions, demonstrating its applicability in a Joule-Thomson cooling cycle.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Tao Bai, Hongxu Xie, Dawei Li, Gang Yan, Jianlin Yu
Summary: This study investigates the start-up characteristics of a mixture-based Joule-Thomson (J-T) refrigeration system with an expansion tank for pressure control. The results demonstrate that the expansion tank can effectively limit the discharge pressure and the pull-down rate is influenced by the control pressure, throttle valve opening, compressor speed, and mixture concentration.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
E. G. Bychkov
Summary: This paper discusses the potential of low-performance throttle low-temperature closed-cycle Joule-Thomson refrigerators in the development of refrigeration equipment, emphasizing the need for an integrated approach to design new types of refrigeration equipment. It proposes a method for designing mixtures with more than three components, involving both design calculation and experimental stages. The results of experimental verification for a low-temperature medical refrigerator based on the original patented layout are presented.
APPLIED THERMAL ENGINEERING
(2022)
Article
Engineering, Multidisciplinary
Kittiwoot Sutthivirode, Tongchana Thongtip
Summary: This paper investigates the performance enhancement of an ejector-based chiller by using different mixing chamber profiles, revealing that the ejector with constant rate of momentum change method produces lower chilled water temperature and increases system COP compared to the conventional method.
ALEXANDRIA ENGINEERING JOURNAL
(2021)
Article
Thermodynamics
D. Aghazadeh Dokandari, R. Haghighi Khoshkhoo, M. Bidi, Mostafa Mafi
Summary: This study introduced two novel combined power-refrigeration cycles to optimize the utilization of liquefied natural gas (LNG) cryogenic energy and reduce exergy destruction. By analyzing design parameters and performing optimization, the cycles showed improved energy efficiency, exergy efficiency, and refrigeration increasing ratio compared to direct LNG evaporation. The maximum obtainable cooling energy ratios in the cycles I and II were 62.6% and 73.9%, respectively.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2021)
Article
Thermodynamics
Zhicheng Pan, Xiaoyong Li, Ling Wang, Taihe Huang, Xiaoqing Zhang, Jianjun Ye, Jianye Chen
Summary: In this study, a conical Hampson J-T cryocooler was designed and fabricated, and its performance was tested using an experimental setup. The cooling capacity, heat transfer coefficient, and efficiency of the cryocooler were analyzed based on experimental data. The results showed that using nitrogen gas as the working fluid at an inlet pressure of 10 MPa, a minimum cooling temperature of 168 K with a cooling capacity of 393.5mW can be achieved. The efficiency of the cryocooler was found to be around 80%.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Jisung Lee, Cheonkyu Lee, Seungwhan Baek, Sangkwon Jeong
INTERNATIONAL JOURNAL OF REFRIGERATION
(2017)
Article
Thermodynamics
Lingxue Jin, Cheonkyu Lee, Seungwhan Baek, Sangkwon Jeong
Article
Thermodynamics
Sehwan In, Seungwhan Baek, Lingxue Jin, Sangkwon Jeong
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2018)
Article
Thermodynamics
Seungwhan Baek, Peter E. Bradley, Ray Radebaugh
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2018)
Article
Thermodynamics
Jisung Lee, Junghan Kim, Hayoung Lim, Sangyeop Han
Article
Thermodynamics
Lingxue Jin, Jisung Lee, Sangkwon Jeong
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2020)
Article
Thermodynamics
Seungwhan Baek, Ray Radebaugh, Peter E. Bradley
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2020)
Article
Thermodynamics
Seungwhan Baek, Youngsuk Jung, Kiejoo Cho
Article
Thermodynamics
Seungwhan Baek, Jisung Lee, Kyung-Seok Kim, Dongsun Shin, Hayoung Lim, Junghan Kim, Jonggyu Kim, Munki Kim, Byoungjik Lim, Chae-hyoung Kim, Sangyeop Han, Kiejoo Cho, Seunghyub Oh, Jeonghwan Ko
Summary: This study presents an evaluation method for predicting the performance of a heat exchanger in a launch vehicle. The effectiveness of the heat exchanger was found to increase with the inlet temperature, and the change in the heat transfer coefficient also affected the effectiveness.
Article
Thermodynamics
Seungwhan Baek, Isang Yu, Kwangkun Park, Youngsuk Jung, Kiejoo Cho
Summary: In liquid propellant propulsion systems, helium pressurization is necessary for transferring liquid propellant from the tank to the engine. However, in a special case, the ullage pressure decreases when cold helium is directly injected due to the splash generated by high-velocity gaseous helium hitting the cryogenic liquid surface. This decreases the ullage temperature and subsequently the ullage pressure. The observed gas-liquid interface disturbance can be utilized for pressure decrease applications in cryogenic liquid storage tanks.
Proceedings Paper
Physics, Applied
Lingxue Jin, Jisung Lee, Sangkwon Jeong
27TH INTERNATIONAL CRYOGENICS ENGINEERING CONFERENCE AND INTERNATIONAL CRYOGENIC MATERIALS CONFERENCE 2018 (ICEC-ICMC 2018)
(2019)
Article
Thermodynamics
Yong Cheng, Fukai Song, Lei Fu, Saishuai Dai, Zhiming Yuan, Atilla Incecik
Summary: This paper investigates the accessibility of wave energy absorption by a dual-pontoon floating breakwater integrated with hybrid-type wave energy converters (WECs) and proposes a hydraulic-pneumatic complementary energy extraction method. The performance of the system is validated through experiments and comparative analysis.
Article
Thermodynamics
Jing Gao, Chao Wang, Zhanwu Wang, Jin Lin, Runkai Zhang, Xin Wu, Guangyin Xu, Zhenfeng Wang
Summary: This study aims to establish a new integrated method for biomass cogeneration project site selection, with a focus on the application of the model in Henan Province. By integrating Geographic Information System and Multiple Criterion Decision Making methods, the study conducts site selection in two stages, providing a theoretical reference for the construction of biomass cogeneration projects.
Article
Thermodynamics
Mert Temiz, Ibrahim Dincer
Summary: The current study presents a hybrid small modular nuclear reactor and solar-based system for sustainable communities, integrating floating and bifacial photovoltaic arrays with a small modular reactor. The system efficiently generates power, hydrogen, ammonia, freshwater, and heat for residential, agricultural, and aquaculture facilities. Thermodynamic analysis shows high energy and exergy efficiencies, as well as large-scale ammonia production meeting the needs of metropolitan areas. The hybridization of nuclear and solar technologies offers advantages of reliability, environmental friendliness, and cost efficiency compared to renewable-alone and fossil-based systems.
Editorial Material
Thermodynamics
Wojciech Stanek, Wojciech Adamczyk
Article
Thermodynamics
Desheng Xu, Yanfeng Li, Tianmei Du, Hua Zhong, Youbo Huang, Lei Li, Xiangling Duanmu
Summary: This study investigates the optimization of hybrid mechanical-natural ventilation for smoke control in complex metro stations. The results show that atrium fires are more significantly impacted by outdoor temperature variations compared to concourse/platform fires. The gathered high-temperature smoke inside the atrium can reach up to 900 K under a 5 MW train fire energy release. The findings provide crucial engineering insights into integrating weather data and adaptable ventilation protocols for smoke prevention/mitigation.
Article
Thermodynamics
Da Guo, Heping Xie, Mingzhong Gao, Jianan Li, Zhiqiang He, Ling Chen, Cong Li, Le Zhao, Dingming Wang, Yiwei Zhang, Xin Fang, Guikang Liu, Zhongya Zhou, Lin Dai
Summary: This study proposes a new in-situ pressure-preserved coring tool and elaborates its pressure-preserving mechanism. The experimental and field test results demonstrate that this tool has a high pressure-preservation capability and can maintain a stable pressure in deep wells. This study provides a theoretical framework and design standards for the development of similar technologies.
Article
Thermodynamics
Aolin Lai, Qunwei Wang
Summary: This study assesses the impact of China's de-capacity policy on renewable energy development efficiency (REDE) using the Global-MSBM model and the difference-in-differences method. The findings indicate that the policy significantly enhances REDE, promoting technological advancements and marketization. Moreover, regions with stricter environmental regulations experience a higher impact.
Article
Thermodynamics
Mostafa Ghasemi, Hegazy Rezk
Summary: This study utilizes fuzzy modeling and optimization to enhance the performance of microbial fuel cells (MFCs). By simulating and analyzing experimental data sets, the ideal parameter values for increasing power density, COD elimination, and coulombic efficiency were determined. The results demonstrate that the fuzzy model and optimization methods can significantly improve the performance of MFCs.
Article
Thermodynamics
Zhang Ruan, Lianzhong Huang, Kai Wang, Ranqi Ma, Zhongyi Wang, Rui Zhang, Haoyang Zhao, Cong Wang
Summary: This paper proposes a grey box model for fuel consumption prediction of wing-diesel hybrid vessels based on feature construction. By using both parallel and series grey box modeling methods and six machine learning algorithms, twelve combinations of prediction models are established. A feature construction method based on the aerodynamic performance of the wing and the energy relationship of the hybrid system is introduced. The best combination is obtained by considering the root mean square error, and it shows improved accuracy compared to the white box model. The proposed grey box model can accurately predict the daily fuel consumption of wing-diesel hybrid vessels, contributing to operational optimization and the greenization and decarbonization of the shipping industry.
Article
Thermodynamics
Huayi Chang, Nico Heerink, Junbiao Zhang, Ke He
Summary: This study examines the interaction between off-farm employment decisions between couples and household clean energy consumption in rural China, and finds that two-paycheck households are more likely to consume clean energy. The off-farm employment of women is a key factor driving household clean energy consumption to a higher level, with wage-employed wives having a stronger influence on these decisions than self-employed ones.
Article
Thermodynamics
Hanguan Wen, Xiufeng Liu, Ming Yang, Bo Lei, Xu Cheng, Zhe Chen
Summary: Demand-side management is crucial to smart energy systems. This paper proposes a data-driven approach to understand the relationship between energy consumption patterns and household characteristics for better DSM services. The proposed method uses a clustering algorithm to generate optimal customer groups for DSM and a deep learning model for training. The model can predict the possibility of DSM membership for a given household. The results demonstrate the usefulness of weekly energy consumption data and household socio-demographic information for distinguishing consumer groups and the potential for targeted DSM strategies.
Article
Thermodynamics
Xinglan Hou, Xiuping Zhong, Shuaishuai Nie, Yafei Wang, Guigang Tu, Yingrui Ma, Kunyan Liu, Chen Chen
Summary: This study explores the feasibility of utilizing a multi-level horizontal branch well heat recovery system in the Qiabuqia geothermal field. The research systematically investigates the effects of various engineering parameters on production temperature, establishes mathematical models to describe their relationships, and evaluates the economic viability of the system. The findings demonstrate the significant economic feasibility of the multi-level branch well system.
Article
Thermodynamics
Longxin Zhang, Songtao Wang, Site Hu
Summary: This investigation reveals the influence of tip leakage flow on the modern transonic rotor and finds that the increase of tip clearance size leads to a decline in rotor performance. However, an optimal tip clearance size can extend the rotor's stall margin.
Article
Thermodynamics
Kristian Gjoka, Behzad Rismanchi, Robert H. Crawford
Summary: This paper proposes a framework for assessing the performance of 5GDHC systems and demonstrates it through a case study in a university campus in Melbourne, Australia. The results show that 5GDHC systems are a cost-effective and environmentally viable solution in mild climates, and their successful implementation in Australia can create new market opportunities and potential adoption in other countries with similar climatic conditions.
Article
Thermodynamics
Jianwei Li, Guotai Wang, Panpan Yang, Yongshuang Wen, Leian Zhang, Rujun Song, Chengwei Hou
Summary: This study proposes an orientation-adaptive electromagnetic energy harvester by introducing a rotatable bluff body, which allows for self-regulation to cater for changing wind flow direction. Experimental results show that the output power of the energy harvester can be greatly enhanced with increased rotatory inertia of the rotating bluff body, providing a promising solution for harnessing wind-induced vibration energy.
