跨临界CO_(2)内部过冷增压制冷系统高级[火用]分析

Advanced exergy analysis of transcritical CO_(2) internal subcooling booster refrigeration system

为了进一步认识系统的不可逆能量损失,采用高级[火用]分析方法应用于跨临界CO_(2)内部过冷增压制冷系统,以室外环境温度15.0和30.0℃为例进行计算。结果表明,可避免[火用]损失最主要的部件是高压级压缩机,其次是气体冷却器,优化的重点应放在这些可避免[火用]损失占比较大的部件上;对于整个系统而言,系统[火用]损的绝大部分是可以避免、内因性的,说明系统大部分的不可逆性可以通过优化部件本身来降低。

In order to further understand the irreversible energy loss of the system,the advanced exergy analysis was carried on for the transcritical CO_(2) internal subcooling booster refrigeration system taking into account the design external temperatures of 15.0 and 30.0℃.The results show that high stage compressor is responsible for the largest exergy loss and followed by gas cooler.The emphasis of optimization should be placed on the components with large avoidable exergy loss.For the whole system,most of the system exergy losses are avoidable and endogenous,which shows that most of the system irreversible exergy loss can be reduced by optimizing the components themselves.