双级压缩自复叠热泵的循环特性研究  

Study on Performance of a Double-stage Compression Auto-cascade Heat Pump

作　　者：王林[1] 郭飞燕 谈莹莹[1] 李修真 WANG Lin;GUO Feiyan;TAN Yingying;LI Xiuzhen(Institute of Building Energy and Thermal Science,Henan University of Science and Technology,Luoyang 471023,China)

机构地区：[1]河南科技大学建筑能源与热科学技术研究所,洛阳471023

出　　处：《工程热物理学报》2025年第3期744-751,共8页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.52378094,No.52278122);河南省高校科技创新团队(No.22IRTSTHN006);河南省重点科技攻关项目(No.232102321092)。

摘　　要：传统单级压缩自复叠热泵存在压缩机排气温度偏高与制热效率偏低等瓶颈问题。基于此,本文构建以R290/R600为工质的双级压缩自复叠热泵循环流程,提出了高低沸点组分的分级压缩匹配低沸点组分的分凝提纯的思想,实现富含低沸点组分与富含高沸点组分的分级压缩过程,从而显著地降低压缩机排气温度和功耗,明显地改善复叠热泵的制热性能。建立双级压缩自复叠热泵的热力学数学模型,比较分析了传统单级压缩自复叠热泵和双级压缩自复叠热泵的循环特性。研究表明:存在最优组分配比使得双级压缩自复叠热泵获得最佳制热性能,当低沸点组分R290质量分数为0.61时,双级压缩自复叠热泵的制热性能系数(COP)达到最大值2.44;随着蒸发温度由−24℃变化到−10℃时,与单级压缩自复叠热泵相比,双级压缩自复叠热泵的排气温度平均降低了24.09℃,压缩机总耗功平均下降了55.49%;随着冷凝温度从50℃增加到65℃,双级压缩自复叠热泵的压缩机耗功较单级压缩自复叠热泵降低了52.82%-56.61%,相应地其制热COP增加了0.91-0.95。双级压缩自复叠热泵适合在寒冷地区或严寒地区推广应用。The conventional single-stage compression auto-cascade heat pump(SACHP)has tough issues such as high compressor discharge temperature and low heating efficiency at the low ambient temperature.Therefore,the concept that the graded compression of high and low boiling point component matches with the fractionation of low boiling point component is presented to develop a double-stage compression auto-cascade heat pump(DACHP)with R290/R600 as the working fluid,which helps reduce the compressor discharge temperature and power consumption,and improve the heating performance of the proposed DACHP.Based on the thermodynamic mathematical model,the cycle performance of DACHP is compared with SACHP.The results indicate that there is an optimal composition ratio for DACHP to obtain the highest heating coefficient of performance(COP),with the maximum COP of 2.44 at the R290 mass fraction of 0.61.When the evaporator outlet temperature varies from−24℃ to−10℃,the average discharge temperature of DACHP decreases by 24.09℃,and the average compressor power consumption of DACHP reduces by 55.49%,compared with the SACHP.The compressor power consumption of DACHP is 52.82%-56.61%lower than that of SACHP,while its COP increases by 0.90-0.95 as compared with DACHP,as the condenser outlet temperature ranges from 50℃ to 65℃.Double-stage compression auto-cascade heat pump is suitable for application in cold areas or severe cold areas.

关 键 词：非共沸混合工质 自复叠热泵 梯级压缩 性能系数 耗功 

分 类 号：TB61[一般工业技术—制冷工程]