共查询到19条相似文献,搜索用时 46 毫秒
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本文应用有限时间热力学方法研究了太阳能热机,以求得太阳热力系统的最佳运行温度,给出了分别基于柯曾-阿尔邦效率和经典卡诺效率的最佳运行温度之间的相对差异。 相似文献
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不同有机工质对太阳能低温热发电效率的影响 总被引:2,自引:0,他引:2
建立了带有工质液态区与两相区二级蒸发器的太阳能低温热发电系统模型。研究工质液态区集热器效率随蒸发器中换热流体和工质两者质量流量比变化的函数关系,并在最佳质量流量比条件下比较不同工质对集热器整体效率的影响。研究发现,相同蒸发温度条件下两相区吸热量与液态区吸热量比值越小的工质,对应的集热器整体效率越高。把不同工质对ORC效率的影响进行对比,指出具有最高的ORC效率的工质并不能同时获得最高的集热效率。对该文研究的热发电系统,在750W/m~2的辐照条件下,R113相比于其它工质发电效率最高,系统最大发电效率达到8.0%。 相似文献
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塔式太阳能热发电系统定日镜场的设计思考 总被引:1,自引:0,他引:1
化石燃料的有限储量及其燃烧产物对环境的污染,使得可再生能源的研究和开发日益迫切。太阳能热发电技术作为最有可能引起能源革命、实现大功率发电的可再生能源技术得到了广泛的关注。20世纪80年代以来,美国、以色列、西班牙等国相继建立了不同形式的太阳能热发电示范装置,促进了塔式太阳能热发电技术的发展。美国能源部主持的研究结果表明:在大规模发电方面,塔式太阳能热发电将是所有太阳能发电技术中成本最低的一种。据预测,到2020年,其发电成本约为每度5美分,具有很强的市场竞争力。 相似文献
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本文通过对太阳能热发电,特别是太阳能斯特林热发电的发展和特点进行了叙述,说明了发展太阳能斯特林发电技术的意义和重要性. 相似文献
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T.A. Chubb 《Solar Energy》1975,17(2):129-136
Energy collected at high temperatures in a set of scattered solar furnaces can be delivered to a central facility at intermediate temperature by using a polyatomic gas in a closed cycle circulation system. For example, gaseous SO3 dissociates at 800 to 1000°C to form SO2 + O2 with absorption of heat; the products recombine in the presence of a catalyst at 500 to 600°C liberating the heat of recombination. A system using SO3 for energy transfer and scaled for production of a continuous 100 MW of electrical power with 3 days of cloudy weather storage is outlined.Alternate working fluids CH4 + H2O, COCl2 and NF3 are compared. Selected design options, potential problem areas, and possibilities of utilizing the collected heat for chemical processing are discussed. 相似文献
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This paper describes a simulation model that reproduces the performance of parabolic trough solar thermal power plants with a thermal storage system. The aim of this model is to facilitate the prediction of the electricity output of these plants during the various stages of their planning, design, construction and operation. Model results for a 50 MWe power plant are presented and compared to real data from an equivalent power plant currently operated by the ACS Industrial Group in Spain. 相似文献
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For the conversion of absorbed sunlight into useful thermal power, we demonstrate that the profiles of absorber temperature, fluid temperature and thermal power delivery along linear solar collectors can be solved in closed form even when the collector heat-loss coefficient is far from constant over the collector operating range. This analytic solution eliminates the errors inherent in earlier approximate solutions, and makes the dependence of collector performance on component properties transparent. An example for a realistic solar concentrator illustrates the improvement in prediction accuracy. 相似文献
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A.Kerim Kar 《Applied Energy》1985,21(4):301-314
Efficiency and optimum operation of flat-plate solar collectors are investigated in terms of exergy delivery of the collector. Various exergy efficiencies are defined and output exergy efficiency is used to determine the optimum flow rate of a typical collector allowing for the pressure drop in tubes. The operation of a collector is investigated for optimum flow rate and various constant inlet temperatures using the output exergy efficiency and thermal efficiency together. 相似文献