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本文分析了常规太阳能动力装置的(火用)效率,从中发现换热器的(火用)损失在二次系统中是主要的。为此建议了一种“分段匹配”方式,以减少由于传热温差引起的可用能损失。本文详细讨论了这种装置的集热器和二次系统的(火用)效率,并与文献[1]的数据进行了比较。计算表明,采用分段匹配方式后,不仅二次系统的(火用)效率可得到提高,而且还能使集热器在较合适的温度范围工作,因而使整个太阳能动力装置的(火用)效率较常规方式的可提高10％—25％,集热器面积相对减少10％—25％,设备投资相对减少6％—13％。本文还讨论了各种影响因素。最后给出了分段匹配时一些主要参数的选择原则。
This paper analyzes the exergy efficiency of conventional solar power plants and finds that the exergy loss of heat exchangers is dominant in secondary systems. For this reason, a “segment matching” approach is proposed to reduce the energy loss due to heat transfer temperature differences. This article discusses in detail the exergy efficiency of the collector and the secondary system of this device and compares it with the data in [1]. The calculations show that not only the exergy efficiency of the secondary system can be improved, but also the collector can work in a more suitable temperature range after using the subsection matching method, thus making the entire solar power plant (fire exergy). The efficiency can be increased by 10%-25% compared with the conventional way, the collector area is relatively reduced by 10%-25%, and the equipment investment is relatively reduced by 6%-13%. This article also discusses various factors. Finally, the principle of selection of some main parameters in segment matching is given.