Founded in 1980, Journal of Engineering Thermophysics is a Chinese academic journal sponsored by the Institute of Engineering Thermophysics, Chinese Academy of Sciences and Chinese Society of Engineering Thermophysics. The journal publishes original papers on engineering thermodynamics and energy utilization, aero thermodynamics, heat transfer and mass transfer, combustion, multiphase flow, experiment method and technology of fluid machinery and engineering thermophysics research, indexed by EI, CA, CSCD, CNKI and so on.

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30 April 2024, Volume 45 Issue 5
  
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  • WANG Tan, CHEN Lingen, GE Yanlin
    2024, 45(5): 1241-1247.
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    A simple gas turbine cycle for space power plant includes three parts: the first is a reactor, the second is closed gas turbine cycle with a compressor, a turbine and two heat exchangers, and the third is a radiator panel to dissipate heat to cosmic space. In this paper, an irreversible simple closed gas turbine cycle model for space power plant is established, and thermal efficiency and power output of the cycle are derived. When total heat transfer area of radiator panel and two heat exchangers is fixed, the maximum power output of the plant is obtained by optimizing area distributions among two HEXs and radiator panel, and the double maximum power output is obtained by optimizing temperature of the low temperature heat sink. 
  • WEN Kai, WANG Chengyuan, WANG Xiaopo, ZHAO Pan, WANG Jiangfeng, HE Maogang
    2024, 45(5): 1248-1254.
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    In order to reduce the energy and water consumption of the cooling system in data center (DC), a DC cooling scheme coupled with radiative sky cooling (RSC) was proposed on the basis of mechanical cooling and direct air-side economizer, the corresponding system configuration and operation strategy were designed, and the mathematical model was established. A modular container DC in Xi’an coupled with the proposed scheme was simulated, and the energy and water saving effects as well as the environmental economic benefits were evaluated. In addition, the regional adaptability of the cooling scheme in 10 typical cities in China was analyzed. The results showed that, the energy saving and emission reduction rate of the proposed coupled cooling scheme (CM) can be attained 55% compared with the mechanical cooling (MCM), and increased by 5.2% compared with the outdoor air humidification scheme (OAHM). Meanwhile, the water consumption is reduced by 18.7%. Additionally, compared with MCM, the energy saving and emission reduction rate of CM in the studied 10 cities is between 42.9% and 78.1%, better energy saving and water saving benefits can be obtained.
  • LI Yang, WANG Nini, CHEN Zhenhua, ZHAO Guangqiang, HE Suoying, GAO Ming
    2024, 45(5): 1255-1263.
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    In order to reduce the influence of alcohol-amine carbon capture system on thermal economy of coal-fired power plants, a carbon capture system was built based on rate model through ASPEN PLUS software, and built a novel carbon capture system integrating rich liquid split process, lean vapor compression process and steam superheat utilization. The results show that when the liquid-rich split ratio is 0.1 and the flash tank pressure is 0.16 MPa, the energy consumption of the novel carbon capture system is the lowest (3.09 GJ/t (CO2)), which is 20.77% lower than that of the conventional carbon capture system. Among them, the utilization of steam superheat reduces the energy consumption of the system by 11.54%. In addition, EBSILON software was used to build the sub-critical unit thermal system coupled with the carbon capture system. The results showed that when the unit load is 127.55 MW and CO2 capture capacity is 500000 tons/year, the boiler heat load of the novel carbon capture unit decreased by 1.87% and the coal consumption for power generation decreased by 7.22 g/kWh. It can be seen that the optimization measures adopted in this study can not only reduce the reboiler duty of the carbon capture system, but also greatly improve the thermal economy of the subcritical carbon capture unit.
  • YAO Wenqi, WANG Jiangjiang, DENG Yu, CUI Zhiheng, GAO Yuefen, ZHANG Xutao
    2024, 45(5): 1264-1274.
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    Syngas fuel generated by solar energy integrating with fuel cell technology is one of the promising methods for future green energy solutions to carbon neutrality. This paper presents a fuel preparation system for solid oxide electrolytic cell (SOEC) based on full spectrum utilization of solar energy, The short wave of sunlight provides the power needed for the co-electrolysis and the long wave provides the heat needed for the system. The thermodynamic model of each component is established, and the thermodynamic, economic and enviro nmental analysis of the system is carried out. Overall exergy efficiency and exergy efficiency of the three modes are 63.1% and 62.5%, 67.3% and 65.8% and 15.0% and 15.6% respectively under the design condition, considering the independent SOEC system, the SOEC subsystem with coupled heat recovery and the SOEC system with solar energy coupled heat recovery. The overall cost rate and CO2 emission rate of the system are 9.79 USD/h and 0.04 kg/kWh, respectively, and the specific exergy cost is 0.086 USD/kWh. In addition, the influence of SOEC operation parameters on the system performance is discussed. When the current density, operating temperature, pressure and water vapor mole fraction are 0.64 A/cm2, 1323.15 K, 0.1 MPa and 20%, respectively, the energy efficiency and exergy efficiency of the system reached the maximum.
  • ZHANG Jie, ZHAO Meng, WANG Haohan, YIN Wenfeng
    2024, 45(5): 1275-1283.
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    To improve the efficiency of dry hot rock development, a multi-branch horizontal well SC-CO2 enhanced geothermal development system is proposed. Effects of branch arrangement, branch number, branch length, branch angle and branch spacing on the system productivity is explored. The results show that production temperature and heat extraction rate of the branch horizontal well system are 3.89% and 11.89% higher than those of the single horizontal system respectively. The production temperature and thermal extraction rate of fishbone horizontal well are the highest among the four branch arrangements. With the increasing of branches in horizontal wells, the production temperature and heat extraction rate becomes higher. Effect of branch length on the system is mainly in the late stage of mining. The longer the branch length is, the lower the production temperature is, and the greater the thermal extraction rate is. Increasing the branch length can prolong the system’s stable operation time. The larger the branch angle is, the higher the production temperature and heat extraction rate is, and it is conducive to extending the service time of the system. The heat extraction rate decreases with the increasing of branch spacing. The production temperature decreases with the increasing of branch spacing before 37.5 years, and that increases with the increasing of branch spacing after 37.5 years.

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ISSN: 0253-231X

CN:11-2091/O4

Journal of Engineering Thermophysics