自复叠双压缩制冷循环特性研究  

Study on an Auto-cascade Parallel-compression Refrigeration Cycle

作　　者：苑佳佳 王林[1] 谈莹莹[1] 李修真 王占伟 黄鲤生 YUAN Jiajia;WANG Lin;TAN Yingying;LI Xiuzhen;WANG Zhanwei;HUANG Lisheng(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》2022年第11期2886-2892,共7页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51876055);河南省高校科技创新团队资助项目(No.22IRTSTHN006);河南省高校科技创新人才资助项目(No.22HASTIT 025)。

摘　　要：传统单级自复叠制冷循环因采用单级压缩存在牺牲高沸点组分支路的压缩比缺陷,导致单级循环所获得制冷效率偏低和制冷温度有限。基于此,提出了一种R23/134a自复叠双压缩制冷循环(ACPR)循环,其特点在于:富含高沸点组分支路的工质只流入低压缩比的高温级压缩机,富含低沸点组分支路的工质只流入高压缩比的低温级压缩机,从而实现这两支路混合工质的分级压缩过程,减少节流损失,降低压缩机总能耗,获得更低极限制冷温度。建立了新循环热力学数学模型,并与传统单级自复叠制冷(ACR)循环进行了性能比较分析。研究结果表明:ACPR循环性能显著优于ACR循环。组分配比是影响循环性能关键参数,低沸点工质R23质量分数为0.35时,两种循环的性能系数(COP)均趋于最大值;当蒸发器入口的蒸发温度从−50℃变化到−30℃时,ACPR循环的压缩机总功耗较ACR循环降低了34.18%∼42.37%,其COP较ACR循环增加了0.50∼0.52;当冷凝器出口的冷凝温度在30∼40℃之间变化时,与ACR循环相比,ACPR的压缩机总功耗降低了34.18%∼42.37%、COP增加了0.48∼0.53。The conventional single-stage auto-cascade refrigeration(ACR) cycle has the defect of sacrificing the compression ratio of high boiling point components due to the use of single-stage compression, which results in low refrigeration efficiency and limited refrigeration temperature. The R23/134a auto-cascade parallel-compression refrigeration(ACPR) cycle is proposed in this paper,which has the following characteristics: the working medium rich in the high boiling point components only flows into the high-temperature compressor with low compression ratio, and the working medium rich in the low boiling point components only flows into the low-temperature compressor with high compression ratio, so as to realize the graded compression process of the mixed working medium of the two branches and reduce the throttling loss, reduce the total power consumption of the compressor and obtain a lower refrigeration temperature. Based on the thermodynamic mathematical model of the new cycle, the performance is compared with the ACR cycle. The results show that the performance of the ACPR cycle is significantly better than that of the ACR cycle. The ratio of components is the key parameter affecting the cycle performance. When the mass fraction of R23 at low boiling point is 0.35, the coefficient of performance(COP) of both cycles tends to the maximum. When the evaporation temperature at the inlet of the evaporator changes from-50℃ to-30℃, the COP of the ACPR increases by 0.50~0.52 and the power consumption of compressor decreases by 34.18%~42.37% compared with the ACR cycle. When the condensing temperature at the outlet of condenser changes from 30℃ to 40℃, compared with the ACR cycle, the COP of the ACPR cycle is increased by 0.48~0.53, and the power consumption of compressor is reduced by34.18%~42.37%.

关 键 词：非共沸混合工质 自复叠 双压缩 性能系数 功耗 

分 类 号：TB611[一般工业技术—制冷工程]