共查询到20条相似文献,搜索用时 67 毫秒
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超导技术在飞轮储能系统中的应用及前景 总被引:1,自引:0,他引:1
阐述了飞轮储能装置原理和超导磁悬浮理论,并设计了超导飞轮储能系统的基本结构。采用超导磁悬浮轴承技术可以解决普通的飞轮储能系统由于有机械轴承摩擦产生的能量损耗,克服普通飞轮储能的低效、储能时间短等问题。最后简要介绍了超导飞轮储能技术的发展前景。 相似文献
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基于(火积)与熵产分析的最优相变温度研究 总被引:1,自引:0,他引:1
蓄能对分布式能源系统的效率有较大影响。本文对于分布式能源系统中蓄能的相变温度,分别采用熵产极值,(火积)耗散极值与广义热阻极值进行优化。结果表明,(火积)耗散极值与广义热阻极值作为优化准则所得的最优相变温度对应蓄热取热功率的极大值。此外,基于(火积)耗散分析方法,分析了二级蓄能的蓄热取热能力,结果表明二级蓄能的蓄热取热量比单级蓄能大,二级蓄能与单级蓄能蓄热量之比与冷热流体入口温度无关,仅与传热单元数有关,且当传热单元数趋于无穷大时,二级蓄能与单级蓄能的蓄热量之比趋于四分之三。 相似文献
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In this study, an energy model based on the first law of thermodynamics is developed to evaluated energy efficiency and specific energy consumption. The influences of hot air temperature and initial weight of coffee beans on energy consumption are considered. Furthermore, a comparison between combined microwave–hot air spouted bed drying and hot air spouted bed drying methods on energy consumption is also investigated in detail. The results show that energy efficiency as well as energy consumption depends on hot air temperature, initial weight of coffee bean, and typical drying methods (combined microwave–hot air spouted bed and hot air spouted bed). The optimum drying condition is also achieved in this study. 相似文献
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B. A. Brusilovsky 《辐射效应与固体损伤》2013,168(3-4):303-306
The effect of polymorphous transitions on the temperature dependence of the number of ions scattered in a given direction has been studied for different scattering angles. 相似文献
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通过一个简单的具体问题,对内能和机械能之间的本质区别进行了解析,这对于深入理解热力学中的概念及其规律的本质是极有意义的。 相似文献
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The nuclear symmetry energy coefficient(including the coefficient a_(sym)~((4)) of the I~4 term) of finite nuclei is extracted by using the differences of available experimental binding energies of isobaric nuclei.It is found that the extracted symmetry energy coefficient a_(sym)~*(A,I) decreases with increasing isospin asymmetry I,which is mainly caused by Wigner correction,since e_(sym)~* is the summation of the traditional symmetry energy e_(sym) and the Wigner energy ew.We obtain the optimal values J = 30.25±0.10 MeV,a_(ss)=56.18±1.25 MeV,a_(sym)~((4)) = 8.33±1.21 MeV and the Wigner parameter x= 2.38 ±0.12 through a polynomial fit to 2240 measured binding energies for nuclei with20 ≤ A ≤ 261 with an rms deviation of 23.42 keV.We also find that the volume symmetry coefficient J■ 30 MeV is insensitive to the value x,whereas the surface symmetry coefficient a_(ss) and the coefficient a_(sym)~((4)) are very sensitive to the value of x in the range 1≤x≤4.The contribution of the a_(sym)~((4)) term increases rapidly with increasing isospin asymmetry I.For very neutron-rich nuclei,the contribution of the a_(sym)~((4)) term will play an important role. 相似文献
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Summary A method is given to calculate the maximum compositional gradient in single crystals, grown by unidirectional solidification,
of binary or pseudobinary materials. The calculation is based on the data obtained from the phase diagrams. Compositional
gradients of HgTe-CdTe and PbTe-SnTe systems along the growth axis are shown. 相似文献
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Chenyixuan Ni Xiaodai Xue Shengwei Mei Xiao-Ping Zhang Xiaotao Chen 《Entropy (Basel, Switzerland)》2020,22(12)
As a fundamental infrastructure of energy supply for future society, energy Internet (EI) can achieve clean energy generation, conversion, storage and consumption in a more economic and safer way. This paper demonstrates the technology principle of advanced adiabatic compressed air energy storage system (AA-CAES), as well as analysis of the technical characteristics of AA-CAES. Furthermore, we propose an overall architectural scheme of a clean energy router (CER) based on AA-CAES. The storage and mutual conversion mechanism of wind and solar power, heating, and other clean energy were designed to provide a key technological solution for the coordination and comprehensive utilization of various clean energies for the EI. Therefore, the design of the CER scheme and its efficiency were analyzed based on a thermodynamic simulation model of AA-CAES. Meanwhile, we explored the energy conversion mechanism of the CER and improved its overall efficiency. The CER based on AA-CAES proposed in this paper can provide a reference for efficient comprehensive energy utilization (CEU) (93.6%) in regions with abundant wind and solar energy sources. 相似文献
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在评价核数据库ENDF VI版的出射粒子能量分布数据(即文档5)中,一些核素在阈能附近的次级中子能量分布大多采用简单的近似方法描述,例如三角形分布或矩形分布.这些简单的近似描述,将导致产生散射矩阵的"双峰"现象,或使平均次级中子能量过大而产生负KERMA(ki netic energy release in materials)因子.针对这两个现象,通过细致的分析,讨论了这些现象的产生原因,并试对相关数据做一定的修正,以改善次级中子分布的能量守恒问题. In file 5 of ENDF VI, the arbitrary tabulated function (L=1) was applied to some threshold reactions of some nuclides. The energy distribution of secondary spectrum was given approximately as a triangular shape or rectangular shape at the threshold energy for some nuclides. The triangular shape distributions would cause two peaked energy distribution near the threshold energy, which must affect the group transfer matrix. The rectangular shape make the E′n too large, that may lead to... 相似文献