基于热力学第一、第二定律,运用集总热容法对太阳能集热以及太阳能在提升低品位热能的过程中所遇到的问题进行理论分析。分析得出了太阳能集热过程中集热器的集热度B与集热工质温度T之间的函数关系,可用于集热方式的选择。在太阳能热利用中选择性涂层的设计影响着集热的效率,通过分析给出选择性涂层设计的截止波长应位于曲线交叉点处的波长。在提升低品位热能时发现存在集热时间缩短的问题,通过加热容积热容量ρc较小的新工质,形成温差对低品位热能间接加热,提高太阳能的利用率。
Based on the first and second laws of thermodynamics, solar energy heat collection and the problems encountered by solar energy in the process of upgrading low-grade heat energy were theoretically analyzed by using the lumped heat capacity method. The functional relationship between the collector heat B of the collector and the collector heat mass temperature T in the solar energy heat collection process were obtained, which can be used for the selection of heat collection modes. The efficiency of heat concentrating in solar thermal utilization was influenced by selective coating design. Analysis showed that the cut-off wavelength of selective coating design should be located at the wavelength of curve intersection. It was found that the heat collection time was shortened when upgrading low-grade heat energy. By heating new working medium with less ρc, the temperature difference was formed to indirectly heat the low-grade heat energy, and the utilization rate of solar energy was improved.
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