回热器对跨临界CO_2压缩喷射系统的影响

THE EFFECT OF INTERNAL HEAT EXCHANGER ON TRANSCRITICAL CO_2 COMPRESSION-EJECTION SYSTEM

为了研究回热器对跨临界CO_2压缩喷射系统的影响,本文在自行搭建的跨临界CO_2压缩喷射系统实验平台上,通过改变冷却水进口温度分别对带回热器的跨临界CO_2压缩喷射系统(TCES-IHX)和不带回热器的跨临界CO_2压缩喷射系统(TCES)进行了性能测试。分析和比较了这两种系统模式下制热系数(COP_h)、制热量、喷射系数、升压比等参数的变化趋势。实验结果表明:回热器的加入使跨临界CO_2压缩喷射系统的压缩机质量流量增加、喷射系数增大而升压比降低,制热系数的增加可以证明回热器对跨临界CO_2压缩喷射系统性能的提高起到积极的作用。

This experimental study presents the effect of internal heat exchanger（IHX） on transcritical CO2 compression-ejection system.An experimental setup of transcritical CO2 compression-ejection system was developed.The performance comparison between the transcritical CO2 ejector systems without IHX（TCES） and with IHX（TCES-IHX） by altering the inlet temperature of cooling water was investigated.Results were analyzed to assess the influence of IHX on the heating coefficient of performance（COPh）,heating capacity,entrainment ratio,and pressure lift.It is found that the refrigerant flow rate through compressor increases,entrainment ratio increases,while pressure lift decreases when the IHX is added into transcritical CO2 compression-ejection system.It has demonstrated that the IHX has a positive effect on increasing COPh of transcritical CO2 compression-ejection system.