Analysis of a novel solar energy-powered Rankine cycle for combined power and heat generation using supercritical carbon dioxide
Analysis of a novel solar energy-powered Rankine cycle for combined power and heat generation using supercritical carbon dioxide
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DOI：
10.1016/j.renene.2005.09.024
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发表时间：
2006-10
期刊：
影响因子：
8.7
通讯作者：
Xin‐Rong Zhang;H. Yamaguchi;D. Uneno;K. Fujima;M. Enomoto;N. Sawada
中科院分区：
文献类型：
--
作者：
Xin‐Rong Zhang;H. Yamaguchi;D. Uneno;K. Fujima;M. Enomoto;N. Sawada
对利用超临界二氧化碳作为工质的太阳能朗肯循环进行了理论分析。在该系统中，一个真正的“自然”的工作流体，二氧化碳，被用来产生第一电力，第二高档热能和低档热能。该系统的独特之处在于，太阳能和二氧化碳在世界各地都有大量的供应，同时用于建立热力循环，并有可能减少能源短缺，大大减少二氧化碳排放和全球变暖，同时提供环境和人身安全。该系统由真空太阳能集热系统、发电涡轮机、高级热回收系统、低级热回收系统和给水泵组成。对CO2朗肯循环的性能进行了理论分析，并研究了太阳辐射、太阳能集热器面积和CO2流量等设计条件对循环性能的影响。数值模拟结果表明，该系统的电、热效率分别可达11.4%和36.2%。还发现循环性能强烈地依赖于气候条件。同时，集热器的电功率和热功率随集热器面积和CO2流量的增加而增加。COPpower和COPheat的估算值随CO2流量的增大而增大，随集热器面积的增大而减小。基于CO2的循环可以被优化以提供最大功率、最大热回收或两者的组合。结果表明，这种新概念的应用潜力，电力和热力发电。
Theoretical analysis of a solar energy-powered Rankine thermodynamic cycle utilizing an innovative new concept, which uses supercritical carbon dioxide as a working fluid, is presented. In this system, a truly ‘natural’ working fluid, carbon dioxide, is utilized to generate firstly electricity power and secondly high-grade heat power and low-grade heat power. The uniqueness of the system is in the way in which both solar energy and carbon dioxide, available in abundant quantities in all parts of the world, are simultaneously used to build up a thermodynamic cycle and has the potential to reduce energy shortage and greatly reduce carbon dioxide emissions and global warming, offering environmental and personal safety simultaneously. The system consists of an evacuated solar collector system, a power-generating turbine, a high-grade heat recovery system, a low-grade heat recovery system and a feed pump. The performances of this CO2-based Rankine cycle were theoretically investigated and the effects of various design conditions, namely, solar radiation, solar collector area and CO2flow rate, were studied. Numerical simulations show that the proposed system may have electricity power efficiency and heat power efficiency as high as 11.4% and 36.2%, respectively. It is also found that the cycle performances strongly depend on climate conditions. Also the electricity power and heat power outputs increase with the collector area and CO2flow rate. The estimated COPpowerand COPheatincrease with the CO2flow rate, but decrease with the collector area. The CO2-based cycle can be optimized to provide maximum power, maximum heat recovery or a combination of both. The results suggest the potential of this new concept for applications to electricity power and heat power generation.