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学者姓名：李学来
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对小流量离心式压缩机内部流动进行了数值模拟,分析了进口叶片角,出口叶片角,叶顶间隙,扩压器出口直径等结构参数对压缩机气动性能的影响,通过内部流场分析探讨了这些参数对气动性能影响的内在机制.分析表明:适当减小叶片入口安装角,适当增大叶片出口安装角,适当减小叶顶间隙,适当减小扩压器出口直径,均可以在一定程度上提升离心压缩机性能.本文研究结果可供小流量离心式的结构优化设计参考.
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| GB/T 7714 | 万欣辰 , 郑闽锋 , 刘曦 et al. 小流量离心式压缩机气动性能数值分析 [J]. | 制冷 , 2021 , 40 (3) : 18-28 . |
| MLA | 万欣辰 et al. "小流量离心式压缩机气动性能数值分析" . | 制冷 40 . 3 (2021) : 18-28 . |
| APA | 万欣辰 , 郑闽锋 , 刘曦 , 李学来 . 小流量离心式压缩机气动性能数值分析 . | 制冷 , 2021 , 40 (3) , 18-28 . |
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过冷水法动态冰浆制取技术是一种有望实现大规模应用的动态制冰方法,工业上常用施加超声场的方式解除过冷水的过冷态并生成冰浆.本文实验研究了不同超声场对质量分数为3％的氯化钠溶液结晶过冷特性、生成冰晶尺寸及粒径分布的影响.结果表明:一定功率和频率的超声场的引入可快速解除过冷,使溶液在接近超声辐照温度下成核,且高功率、低频率的超声场更有利于成核发生.当功率、频率、辐照温度分别在10.0～40.0 W、28～40 kHz及0～4.0℃范围内,最佳超声场设置方案为超声功率40.0 W、频率28 kHz、辐照温度2.0℃;超声场的施加可显著减小冰晶尺寸;随着成核后超声辐照时间的延长,冰晶粒径先增大后趋于平缓,超声功率及频率的变化对冰晶粒径尺寸的影响无显著作用.
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| GB/T 7714 | 刘曦 , 李月玲 , 王锦辉 et al. 超声场对过冷水溶液结晶的影响 [J]. | 制冷学报 , 2021 , 42 (5) : 118-126 . |
| MLA | 刘曦 et al. "超声场对过冷水溶液结晶的影响" . | 制冷学报 42 . 5 (2021) : 118-126 . |
| APA | 刘曦 , 李月玲 , 王锦辉 , 林立 , 李学来 . 超声场对过冷水溶液结晶的影响 . | 制冷学报 , 2021 , 42 (5) , 118-126 . |
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In this paper, a CO2 supermarket refrigeration system using multi-ejector and dedicated mechanical subcooling (MEJ + DMS) is proposed to solve the problem of low performance of the CO2 refrigeration system in high temperature area and evaluate the feasibility application in China. A detailed thermodynamic performance analysis is conducted with MATLAB software. Furthermore, the annual energy consumption and seasonal energy efficiency ratio (SEER) are used as the major indicators to assess the system performance in five typical representative cities of diverse climate types in China. The results indicate that compared with the basic booster system (BASE), the system with dedicated mechanical subcooling (DMS), and that with multi-ejector (MEJ), the MEJ + DMS system permits not only reducing the operating pressure of the system but also enhancing the maximum COP by 61.76%, 19.17% and 20.21%, respectively at the ambient temperature of 40 degrees C. Furthermore, the annual analysis shows that the MEJ + DMS system can save energy by 29.94% and increase SEER by 42.73% in hot summer and warm winter zone. The new proposed system has the advantages of greatly promoting system performance and saving energy and is expected to replace the existing CO2 supermarket booster refrigeration systems. (C) 2021 The Authors. Published by Elsevier Ltd.
Keyword ：
CO2 CO2 Dedicated mechanical subcooling Dedicated mechanical subcooling Multi-ejector Multi-ejector Refrigeration Refrigeration Supermarket Supermarket
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| GB/T 7714 | Liu, Xi , Yu, Kaihong , Wan, Xinchen et al. Performance evaluation of CO2 supermarket refrigeration system with multi-ejector and dedicated mechanical subcooling [J]. | ENERGY REPORTS , 2021 , 7 : 5214-5227 . |
| MLA | Liu, Xi et al. "Performance evaluation of CO2 supermarket refrigeration system with multi-ejector and dedicated mechanical subcooling" . | ENERGY REPORTS 7 (2021) : 5214-5227 . |
| APA | Liu, Xi , Yu, Kaihong , Wan, Xinchen , Li, Xuelai . Performance evaluation of CO2 supermarket refrigeration system with multi-ejector and dedicated mechanical subcooling . | ENERGY REPORTS , 2021 , 7 , 5214-5227 . |
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This paper assesses the exergetic performance inside transcritical CO2 ejector refrigeration system integrated with thermoelectric subcooler (EJE + TES) through conventional and advanced exergy analyses. The results point out that 89.44% of the total exergy destruction is endogenous, which clearly demonstrates that it is not close in the interrelations among the system components. In addition, increasing the efficiency of the different components can decrease the exergy destruction by about 53.36%. The avoidable exergy destructions induced by the compressor is the highest, which indicates that priority should be given to the improvement of the compressor, followed by the thermoelectric subcooler, evaporator, ejector and gas cooler, while the expansion valve has almost no potential for improvement. This conclusion differs from that obtained by the conventional exergy method. The effects of the pinch temperature difference in each heat exchanger, as well as the compressor and ejector efficiencies on cycle theoretically exergetic performance are considered. When the compressor and ejector efficiencies increase from 0.5 to 0.9, the avoidable endogenous exergy destruction taking place in the corresponding system component are reduced by 93.61% and 82.33%, respectively. The performance of the EJE + TES system can be enhanced through reducing the pinch temperature difference. (C) 2021 The Authors. Published by Elsevier Ltd.
Keyword ：
Advanced exergy analysis Advanced exergy analysis CO2 CO2 Ejector Ejector Thermoelectric subcooler Thermoelectric subcooler Transcritical refrigeration system Transcritical refrigeration system
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| GB/T 7714 | Liu, Xi , Yu, Kaihong , Wan, Xinchen et al. Conventional and advanced exergy analyses of transcritical CO2 ejector refrigeration system equipped with thermoelectric subcooler [J]. | ENERGY REPORTS , 2021 , 7 : 1765-1779 . |
| MLA | Liu, Xi et al. "Conventional and advanced exergy analyses of transcritical CO2 ejector refrigeration system equipped with thermoelectric subcooler" . | ENERGY REPORTS 7 (2021) : 1765-1779 . |
| APA | Liu, Xi , Yu, Kaihong , Wan, Xinchen , Zheng, Minfeng , Li, Xuelai . Conventional and advanced exergy analyses of transcritical CO2 ejector refrigeration system equipped with thermoelectric subcooler . | ENERGY REPORTS , 2021 , 7 , 1765-1779 . |
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为了分析水平管降膜式蒸发器管间流型的转换规律,设计一种多层布液器,采用可视化方法研究开孔规格、布液高度和管间距对管间流型转换的影响.试验结果表明,在一定流量下,流型转换的临界雷诺数与布液孔径、布液孔间距、布液高度、管间距、流动介质有关.根据试验数据拟合得到临界雷诺数Re与伽利略数Ga的关系,发现柱状流到柱-膜状流的过渡区域比较大.
Keyword ：
布液器 布液器 水平管 水平管 流型转换 流型转换 蒸发器 蒸发器 降膜 降膜
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| GB/T 7714 | 姚宁 , 吴爱华 , 林嘉铭 et al. 水平管降膜式蒸发器管间流型转换试验研究 [J]. | 制冷与空调 , 2020 , 20 (4) : 54-58 . |
| MLA | 姚宁 et al. "水平管降膜式蒸发器管间流型转换试验研究" . | 制冷与空调 20 . 4 (2020) : 54-58 . |
| APA | 姚宁 , 吴爱华 , 林嘉铭 , 胡晟煜 , 张政 , 李学来 . 水平管降膜式蒸发器管间流型转换试验研究 . | 制冷与空调 , 2020 , 20 (4) , 54-58 . |
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过冷水法动态冰浆制取技术具有传热效率高、系统简单等优点,但过冷却器易发生冰堵是影响其稳定性的突出问题.本文提出一种基于模块化过冷解除装置的动态制冰系统,利用设置在过冷却器内的可灵活拆装式螺旋叶片对制冰溶液进行过冷解除,同时刮削换热壁面上粘附的冰晶.测试了不同工况下该制冰系统的性能,结果表明该制冰系统可稳定产出冰浆并有效改善冰堵问题,最高含冰率达9.1％,最大持续制冰时间可达521 s.冰浆含冰率与持续制冰时间成正比.NaCl添加剂质量分数为6％时对冰浆含冰率和持续制冰时间的改善效果显著.实验获得制冰系统最佳运行参数:制冰溶液体积流量为0.50 m3/h、二次冷媒起始温度为-15℃、螺旋叶片转速为175～225 r/min.
Keyword ：
冰浆 冰浆 制冰能力 制冰能力 相变 相变 过冷度 过冷度
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| GB/T 7714 | 庄焜煜 , 刘曦 , 姚威 et al. 基于模块化过冷解除的冰浆制取系统实验研究 [J]. | 制冷学报 , 2020 , 41 (2) : 56-62 . |
| MLA | 庄焜煜 et al. "基于模块化过冷解除的冰浆制取系统实验研究" . | 制冷学报 41 . 2 (2020) : 56-62 . |
| APA | 庄焜煜 , 刘曦 , 姚威 , 傅阮松 , 王志强 , 李学来 . 基于模块化过冷解除的冰浆制取系统实验研究 . | 制冷学报 , 2020 , 41 (2) , 56-62 . |
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In this study, the performance of ice slurry production by scraped-surface method was experimentally investigated. Temperature change characteristics, ice packing fraction (IPF) of ice slurry, power consumption of scraping system and coefficient of performance (COP) were measured by varying the concentration of sodium chloride solution, scraping speed, and solution flow rate. The effect of nanosilica on efficiency of ice slurry production was also studied. The results showed that scraping power consumption accounted for only a small proportion (about 5%) of the total power consumption of the system. An increase in the concentration of sodium chloride caused a decrease in the IPF and a decrease in the COP of the system. With the solution flow rate at 1.3 m(3)/h and scraping speed at 13 rpm, the maximum COP (2.43) was obtained. Furthermore, the addition of nanosilica had a significant effect on improving the system COP.
Keyword ：
ice slurry ice slurry nanosilica nanosilica performance performance scraped-surface method scraped-surface method
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| GB/T 7714 | Liu, Xi , Li, Yueling , Zhuang, Kunyu et al. Performance Study and Efficiency Improvement of Ice Slurry Production by Scraped-Surface Method [J]. | APPLIED SCIENCES-BASEL , 2019 , 9 (1) . |
| MLA | Liu, Xi et al. "Performance Study and Efficiency Improvement of Ice Slurry Production by Scraped-Surface Method" . | APPLIED SCIENCES-BASEL 9 . 1 (2019) . |
| APA | Liu, Xi , Li, Yueling , Zhuang, Kunyu , Fu, Ruansong , Lin, Shi , Li, Xuelai . Performance Study and Efficiency Improvement of Ice Slurry Production by Scraped-Surface Method . | APPLIED SCIENCES-BASEL , 2019 , 9 (1) . |
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In this paper, the new configuration of transcritical CO2 refrigeration cycle combined with a thermoelectric subcooler and an ejector (TES + EJE) is proposed. The thermoelectric subcooler is installed after the gas cooler in the transcritical CO2 refrigeration cycle with an ejector. Comparisons are carried out with the conventional transcritical CO2 refrigeration cycle (BASE), CO2 cycle with a thermoelectric subcooler (TES) and CO2 cycle with an ejector (EJE). Maximum cooling coefficient of performance (COPc) is obtained for the new TES + EJE cycle with a simultaneous optimization of subcooling temperature and discharge pressure. The improved new cycle exhibits higher COPc and lower discharge pressure compared with the other three cycles. Compared with the BASE cycle, the maximum COPc of the TES + EJE cycle is increased by 39.34% and the corresponding optimum discharge pressure is reduced by 8.01% under given operation conditions of 5 degrees C evaporation temperature and 40 degrees C gas cooler outlet temperature. The effects of the subcooling temperature, discharge pressure, gas cooler outlet temperature and evaporation temperature on the TES + EJE system performance are also discussed by energy and exergy analysis and results present here.
Keyword ：
Carbon dioxide Carbon dioxide Cooling coefficient of performance Cooling coefficient of performance Ejector Ejector Exergy loss rate Exergy loss rate Thermoelectric subcooler Thermoelectric subcooler Transcritical refrigeration cycle Transcritical refrigeration cycle
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| GB/T 7714 | Liu, Xi , Fu, Ruansong , Wang, Zhiqiang et al. Thermodynamic analysis of transcritical CO2 refrigeration cycle integrated with thermoelectric subcooler and ejector [J]. | ENERGY CONVERSION AND MANAGEMENT , 2019 , 188 : 354-365 . |
| MLA | Liu, Xi et al. "Thermodynamic analysis of transcritical CO2 refrigeration cycle integrated with thermoelectric subcooler and ejector" . | ENERGY CONVERSION AND MANAGEMENT 188 (2019) : 354-365 . |
| APA | Liu, Xi , Fu, Ruansong , Wang, Zhiqiang , Lin, Li , Sun, Zhixin , Li, Xuelai . Thermodynamic analysis of transcritical CO2 refrigeration cycle integrated with thermoelectric subcooler and ejector . | ENERGY CONVERSION AND MANAGEMENT , 2019 , 188 , 354-365 . |
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提出了在露天环境下一种太阳能半导体保鲜装置,并对装置结构、半导体制冷组件、光伏组件进行了设计计算与选择,最后对该装置进行实验研究与分析.实验表明,在稳定工况下半导体制冷片存在最佳制冷系数的电流Iopt=2.7A,最大制冷量的电流I.=3.5 A;不同环境温度下保温箱的温度在40-50 min时趋于稳定,且在环境温度T0=30℃时,半导体制冷系数COP达到最大值为0.426;随散热风扇电压增大,半导体制冷系数COP增大,而系统COP’先增大后减小,且在环境温度T0 =30℃、输入电压为10 V时COP’达到最大值为0.391.
Keyword ：
COP COP 保鲜装置 保鲜装置 半导体制冷 半导体制冷 太阳能发电 太阳能发电
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| GB/T 7714 | 黄双福 , 李学来 , 袁俊威 et al. 太阳能半导体保鲜装置实验设计与性能研究 [J]. | 低温工程 , 2019 , (5) : 40-46 . |
| MLA | 黄双福 et al. "太阳能半导体保鲜装置实验设计与性能研究" . | 低温工程 5 (2019) : 40-46 . |
| APA | 黄双福 , 李学来 , 袁俊威 , 林金山 . 太阳能半导体保鲜装置实验设计与性能研究 . | 低温工程 , 2019 , (5) , 40-46 . |
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针对水平管降膜蒸发器中常见的液膜分布不均匀的问题,提出并设计了一种新型孔板结构的液体分布器.实验探究了进液流量、 布液孔间距、 孔径和分流区间距、 温度等因素对于布液效果的影响.实验结果表明:该新型液体分布器布液效果良好,平均不均匀度最低可达0.074.随着进液流量的增加,液体分布器的各孔流量分布的均匀性也会增加.布液孔间距对不均匀度的影响随着进液流量的增加而减小;不均匀度随着布液孔孔径和分流区间距的增大而减小;温度通过影响介质粘度和密度影响布液效果,不均匀度随温度的升高而降低.
Keyword ：
均匀性 均匀性 层流 层流 布液效果 布液效果 水平降膜 水平降膜 液体分布器 液体分布器
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| GB/T 7714 | 张政 , 林仕 , 姚宁 et al. 新型孔板式液体分布器的性能研究 [J]. | 制冷 , 2019 , 38 (1) : 1-7 . |
| MLA | 张政 et al. "新型孔板式液体分布器的性能研究" . | 制冷 38 . 1 (2019) : 1-7 . |
| APA | 张政 , 林仕 , 姚宁 , 刘曦 , 庄焜煜 , 李学来 . 新型孔板式液体分布器的性能研究 . | 制冷 , 2019 , 38 (1) , 1-7 . |
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