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CPC在太阳能热利用中的应用 总被引:1,自引:0,他引:1
综述了CPC聚光器的光学原理、制作方法、优点和在太阳能领域的应用;分析了CPC由倒V型结构向W型结构发展的原因;阐述并提出了直通式CPC、热管式CPC、自聚光式CPC的结构和优点;设计了多种双层玻璃管式CPC结构。 相似文献
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为提高槽式聚光系统的聚光均匀性,提出一种槽式均匀聚光系统,建立了该系统反射聚光器模型,并对其聚光效果进行了分析.对系统的几何参数分析表明,随着反射镜面数量的增加其宽度在逐渐减小而其倾角却在逐渐增加,系统最大几何聚光比随系统的几何高宽比δ增大而增加.利用蒙特卡罗光线追迹方法对该聚光器的聚光效果进行模拟,结果表明该系统的聚光均匀性明显优于传统的槽式聚光器聚光效果,能够满足设计需求. 相似文献
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槽式太阳聚光器的研究 总被引:1,自引:0,他引:1
提出了一种低倍聚光的抛物面槽式聚光光伏发电方式.从聚光器的聚光比入手,推导抛物面槽式聚光的能流聚光比的公式,分析了能流聚光比和各个参数的关系.依据这些关系式制成的低倍聚光装置适宜于普及,可节约光伏装置成本,增加光伏发电量. 相似文献
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槽式太阳能聚光集热系统在不同跟踪模式下的对比 总被引:2,自引:0,他引:2
根据合肥地区的实测气象数据,采用数值模拟和实验分析相结合的方法,对槽式太阳能聚光集热系统在春、夏、秋、冬4个典型工况下的3种不同跟踪模式(二维跟踪、东西向跟踪和南北向跟踪)的性能进行研究和分析。结果显示:采用东西向跟踪时,系统的集热性能主要受一年四季太阳位置的变化以及太阳辐照强度的影响,夏季时系统集热效率最大,达到0.351,冬季最小,降至0.196;而采用南北向跟踪和二维跟踪时,系统的集热性能主要受太阳辐照强度的影响,其中,南北跟踪时系统效率为0.300~0.312,二维跟踪时系统效率为0.347~0.363。 相似文献
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A review of solar chimney power technology 总被引:1,自引:0,他引:1
Xinping Zhou Fang Wang Reccab M. Ochieng 《Renewable & Sustainable Energy Reviews》2010,14(8):2315-2338
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Zhifeng Wang 《Energy》2010
China's total installed electrical power capacity reached 700 GW by the end of 2007 and is predicted to surpass 900 GW in 2010. The rapid increase in energy demand and increasing global warming have both pushed China to change its current electrical power structure where coal power accounts for nearly 75% of the total electric power generation. China has already become the world's largest solar water heater producer and user. However, there is still much to be done in the solar thermal power field before its commercialization. Solar thermal power technologies including solar power towers, solar parabolic trough concentrators, solar dish/stirling systems, linear Fresnel reflectors, and solar chimneys have been studied in China since the 1980s. A 10 kW dish/stirling project was funded by the Ministry of Science and Technology (MOST) during 2000–2005 with a 1 MW solar power tower and research of trough concentrator metal–glass evacuated tubes supported during 2006–2010. This paper describes a continued solar thermal power development roadmap in China in 5-year intervals between 2006 and 2025. 相似文献
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It is recognized that the temperature potential of concentrated solar energy is much higher than needed by standard conversion cycles. High temperature solar receivers are in the development stage hopefully leading to the use of solarized gas turbines or of solar combined cycles. These systems are analyzed and taken as a reference standard. Binary alkali-metal steam cycles are shown to be intrinsically more efficient than combined cycles owing to their fully condensing nature. Even at top temperatures of about 600 °C typical for steam cycles the binary cycle allows, in principle, a significant efficiency gain (49.5% against 43% of a steam cycle). However, the binary high temperature systems are investigated featuring either a direct vaporization of the metal within the receiver or a liquid receiver cooling loop with the working fluid vaporized in a proper heat exchanger.With reference to the second option, the computed efficiency is 56% at a top cooling loop temperature of 1000 °C (the same efficiency is attained in a direct vaporization loop at 720 °C). A 60% thermal efficiency is within the potential of the technology. The above figures can be compared with a combined cycle efficiency of 50% at 1200 °C turbine inlet temperature.Available alkali metals are reviewed for the use of working fluid: potassium being the best known fluid but rubidium (or cesium) offering, in perspective, a better overall performance. Material problems connected with the containment of alkali metals at high temperature are reviewed. Experimental evidence suggests that up to 800–850 °C stainless steel is an adequate material, while for higher temperatures, up to 1200 °C, refractory metals should be used.With reference to heat storage the availability of appropriate high temperature substances either as liquids or as melting solids, storing energy as sensible or as latent heat respectively, is discussed.Finally the critical issue of metal vapour turbine design is considered. The results of a number of computations are presented giving the basic geometrical data of some potassium, rubidium and cesium expanders. Rotor diameters tend to be comparatively large. With reference to a 50 MW overall plant output the maximum tip diameter is 3.9 m for a potassium and 2.8 m for a rubidium turbine. 相似文献
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