Article
Chemistry, Physical
Haocheng Wang, Jingyao Yang, Xueqiang Dong, Yanxing Zhao, Hao Guo, Maoqiong Gong
Summary: This paper proposes a dual reverse Brayton cycle (dual-RBC) process to reduce the power consumption of hydrogen liquefaction. By replacing the typical hydrogen cycle with an independent helium cycle, it reduces the temperature difference and exergy loss, resulting in a 4.16% lower specific power consumption compared to traditional processes. Moreover, the adoption of a mixed-refrigerant J-T cycle significantly reduces the precooling power consumption, making the process more feasible and technologically mature.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Biochemistry & Molecular Biology
Alanood A. Alsarayreh, Mudhar A. Al-Obaidi, Alejandro Ruiz-Garcia, Raj Patel, Iqbal M. Mujtaba
Summary: This paper investigates the energy dissipation and thermodynamic limitations of the RO system of the Arab Potash Company. By using RO and exergy analysis models, the distribution of energy dissipation is explored, revealing that the highest dissipation occurs in the product stream, while the lowest dissipation occurs in the mixing location of the first pass of the RO desalination system.
Article
Thermodynamics
Jiang Bian, Jian Yang, Yuxing Li, Zhaoqi Chen, Fachun Liang, Xuewen Cao
Summary: The proposed hydrogen liquefaction process has lower operating costs and capital costs compared to reference processes, especially in terms of helium and heat exchangers. The energy consumption of the proposed process is lower and the performance is higher than that of the reference processes.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Multidisciplinary Sciences
Yunis Khan, Deepak Singh, Hakan Caliskan, Hiki Hong
Summary: In this study, a novel combined power cycle for solar power tower system is proposed and compared with the basic cycle. The optimized cycle shows improved thermal and exergy efficiency, as well as reduced electricity cost, making it superior to other existing systems.
Article
Physics, Multidisciplinary
Shunsen Wang, Bo Li
Summary: A power-water cogeneration system based on a supercritical carbon dioxide Brayton cycle and reverse osmosis unit is proposed to recover waste heat of a gas turbine. System performance can be improved by increasing the preheating temperature and optimizing the exergy efficiency.
Article
Chemistry, Multidisciplinary
Xiaoling Yang, Zhefeng Wang, Ze Zhang, Shuangtao Chen, Yu Hou, Liang Chen
Summary: This study investigates the thermodynamic performance of air refrigeration cycles in compartment air conditioning and presents the effects of compressor efficiency, expander efficiency, ambient humidity, all-fresh-air supply, and ambient pressure on the cycle performance.
APPLIED SCIENCES-BASEL
(2022)
Article
Thermodynamics
Zekuan Liu, Zixuan Wang, Kunlin Cheng, Cong Wang, Chan Ha, Teng Fei, Jiang Qin
Summary: The coupling of organic Rankine cycle (ORC) system with closed Brayton cycle (CBC) system is an effective method to recover waste heat and generate more electricity, solving the challenge of lunar base energy system during the long lunar night. A mathematical model is developed to evaluate the variation of thermal efficiency, exergy destruction, and Brayton-Rankine rotating unit (BRRU) mass throughout the lunar day with the driving source of collector or heat storage unit. The results show that when the helium mole fraction is 0.9, CBC stops on the day of 7.7 at night, with a maximum power generation of 169.21 kW. The thermal and exergy efficiency can reach 34.49% and 31%, respectively. After three-objective optimization, the thermal efficiency (30.07%), exergy destruction (169.62 kW), and BRRU mass (720.3 kg) can be improved compared to the basic working condition, which is crucial for practical applications.
Article
Thermodynamics
Xuewen Cao, Jian Yang, Yue Zhang, Song Gao, Jiang Bian
Summary: A novel cascade nitrogen expansion re-liquefaction process is proposed in this study to reduce energy consumption by optimizing heat exchange efficiency, and compared with the parallel expansion process. The designed process has lower energy consumption, higher exergy efficiency, and saves total costs compared to the reference process.
Article
Energy & Fuels
Gontzal Lopez-Ruiz, Joseba Castresana-Larrauri, Jesus Maria Blanco-Ilzarbe
Summary: This study analyzed the impact of using fuel blends with varying hydrogen percentages on a simple regenerative Brayton cycle. The results showed that increasing the hydrogen percentage can improve both the overall exergetic and energetic efficiencies, while reducing exergy destruction in the chamber. Despite its higher cost, hydrogen can still be competitive in terms of fuel mass flow rates.
Review
Thermodynamics
Sivakumar Vaithilingam, Sakthivel Thirumalai Gopal, Senthil Kumar Srinivasan, A. Muthu Manokar, Ravishankar Sathyamurthy, Ganapathy Sundaram Esakkimuthu, Ravinder Kumar, Mohsen Sharifpur
Summary: The scarcity of freshwater is a major threat to sustainable environmental development. Solar energy desalination is considered a suitable and cost-effective technique to convert brackish water into freshwater. Compared to traditional desalination processes, desalination using solar energy is more efficient and economical.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
Zekuan Liu, Kunlin Cheng, Zixuan Wang, Cong Wang, Jing Xu, Teng Fei, Jiang Qin
Summary: This paper evaluates the performance of a CBC-ORC system by establishing mathematical models with different positions of the regenerator. The results indicate that the CBC regenerator significantly improves the thermal efficiency of the system during lunar daytime, while the ORC regenerator has limited impact. Additionally, the CBC regenerator reduces the heat exchange area of solar trough collector and radiator and balances the energy consumption of each equipment.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
R. Huang, Bin Hu, R. Z. Wang, Trygve Magne Eikevik, T. S. Ge
Summary: This study innovatively applies the reverse-Brayton cycle to CO2 heat pumps to increase the output water temperature. The effects of discharge pressure, suction temperature, injection mass ratio, and pressure of refrigerant injection on the COP of the system are analyzed. Simulation results show that the proposed system has a high COP and can provide high temperature hot water or steam, expanding the application scope of CO2 heat pumps in industries.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2022)
Article
Nuclear Science & Technology
M. G. McKellar, D. P. Guillen
Summary: Thermodynamic analyses were conducted to assess the performance of recuperated open air Brayton cycles for nuclear micro-reactors with a power output of 3 MWe. The study compared the efficiencies of the recuperated air Brayton cycles under steady-state operating conditions for various climate conditions, reactor types, turbomachinery efficiencies, and recuperator performance. The results showed that climate had the largest impact on the thermal efficiency of the cycles, while humidity had a negligible effect.
PROGRESS IN NUCLEAR ENERGY
(2023)
Article
Thermodynamics
Hakan Aygun
Summary: The Application field of gas turbine engines has greatly expanded due to their significant properties. Turboshaft engines, as one type of aero-engines, have attracted attention in recent years due to increased usage areas. This study evaluated the thermodynamic performance of a conceptual turboshaft engine with free turbine (TSEFT) using various parameters, including performance, energetic, exergetic, and environmental factors. The findings provide guidance for engineers to determine optimum power settings for the highest sustainability level.
Article
Thermodynamics
Wengang Bai, Hongzhi Li, Xuwei Zhang, Yongqiang Qiao, Chun Zhang, Wei Gao, Mingyu Yao
Summary: This study proposes and evaluates the use of CO2-SF6 mixture as working fluid in the Brayton cycle system to overcome the poor cycle thermal efficiency of supercritical CO2 cycle used in solar power plants. Thermodynamic analysis shows that the thermal efficiency of the CO2-SF6 mixture cycle is significantly higher than that of the supercritical CO2 cycle, and there exists an optimal mole fraction of SF6. The heliostat field and solar receiver have the lowest efficiency among all the components in the CO2-SF6 mixture cycle.
