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Optimization of a New Design of Molten Salt-to-CO2 Heat Exchanger Using Exergy Destruction Minimization
Entropy ( IF 2.7 ) Pub Date : 2020-08-12 , DOI: 10.3390/e22080883 María José Montes , José Ignacio Linares , Rubén Barbero , Beatriz Yolanda Moratilla
Entropy ( IF 2.7 ) Pub Date : 2020-08-12 , DOI: 10.3390/e22080883 María José Montes , José Ignacio Linares , Rubén Barbero , Beatriz Yolanda Moratilla
One of the ways to make cost-competitive electricity, from concentrated solar thermal energy, is increasing the thermoelectric conversion efficiency. To achieve this objective, the most promising scheme is a molten salt central receiver, coupled to a supercritical carbon dioxide cycle. A key element to be developed in this scheme is the molten salt-to-CO2 heat exchanger. This paper presents a heat exchanger design that avoids the molten salt plugging and the mechanical stress due to the high pressure of the CO2, while improving the heat transfer of the supercritical phase, due to its compactness with a high heat transfer area. This design is based on a honeycomb-like configuration, in which a thermal unit consists of a circular channel for the molten salt surrounded by six smaller trapezoidal ducts for the CO2. Further, an optimization based on the exergy destruction minimization has been accomplished, obtained the best working conditions of this heat exchanger: a temperature approach of 50 °C between both streams and a CO2 pressure drop of 2.7 bar.
中文翻译:
使用火用破坏最小化优化熔盐-CO2 换热器的新设计
利用集中的太阳能热能制造具有成本竞争力的电力的方法之一是提高热电转换效率。为了实现这一目标,最有前途的方案是熔盐中央接收器,与超临界二氧化碳循环相结合。该方案中要开发的一个关键要素是熔盐-CO2 热交换器。本文提出了一种换热器设计,它避免了熔盐堵塞和 CO2 高压引起的机械应力,同时由于超临界相的紧凑性和高传热面积而改善了超临界相的传热。这种设计基于蜂窝状配置,其中热单元由一个圆形熔盐通道组成,周围环绕着六个较小的 CO2 梯形管道。更多,
更新日期:2020-08-12
中文翻译:
使用火用破坏最小化优化熔盐-CO2 换热器的新设计
利用集中的太阳能热能制造具有成本竞争力的电力的方法之一是提高热电转换效率。为了实现这一目标,最有前途的方案是熔盐中央接收器,与超临界二氧化碳循环相结合。该方案中要开发的一个关键要素是熔盐-CO2 热交换器。本文提出了一种换热器设计,它避免了熔盐堵塞和 CO2 高压引起的机械应力,同时由于超临界相的紧凑性和高传热面积而改善了超临界相的传热。这种设计基于蜂窝状配置,其中热单元由一个圆形熔盐通道组成,周围环绕着六个较小的 CO2 梯形管道。更多,