R1150/R600a自复叠制冷循环开机动态特性实验研究  

Experimental study on startup dynamic characteristics of R1150/R600a auto-cascade refrigeration cycle

作　　者：谈莹莹[1] 刘晓庆[1] 王林[1] 黄鲤生 李修真 王占伟 TAN Yingying;LIU Xiaoqing;WANG Lin;HUANG Lisheng;LI Xiuzhen;WANG Zhanwei(Institute of Building Energy and Thermal Science,Henan University of Science and Technology,Luoyang 471003,Henan,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,河南洛阳471003

出　　处：《化工学报》2023年第S01期213-222,共10页CIESC Journal

基　　金：国家自然科学基金项目(51876055,51706061);河南省重点研发与推广专项(科技攻关)项目(222102320357);河南省高校科技创新团队项目(22IRTSTHN006);河南省高校合计创新人才项目(22HASTIT025)。

摘　　要：搭建带分凝器的自复叠制冷循环实验台,采用环境友好非共沸混合工质R1150/R600a,通过实验分析了带分凝器的自复叠制冷循环和传统自复叠制冷循环在不同蒸发压力和组分配比下的开机动态特性。研究表明,随着蒸发压力降低,两种循环制冷温度均降低、排气压力均升高,带分凝器的自复叠制冷循环温降更大,蒸发器进口温度最低可达到-73.8℃;开机后,带分凝器的自复叠制冷循环更快达到稳定制冷温度,低温箱温降速率更快。R1150/R600a组分配比为0.3∶0.7时,蒸发器进口温度最低可达到-77.2℃,较传统循环低5.6℃。随着低沸点组分增大,两种循环降温速率更快,但压缩机的排气温度升高,带分凝器的自复叠制冷循环压缩机排气温度较传统自复叠制冷循环高25.0~36.0℃。An experimental bench of auto-cascade refrigeration cycle with dephlegmator was set up.The startup dynamic characteristics of the auto-cascade refrigeration cycle with dephlegmator and that of the traditional auto-cascade refrigeration cycle under different evaporation pressure and composition ratio were analyzed experimentally using the environment-friendly non-azeotropic mixed refrigerant R1150/R600a.The results showed that the refrigeration temperatures of both cycles decreased and the compressor exhaust pressures increased with the decrease of evaporative pressure,and the temperature drop of auto-cascade refrigeration cycle with dephlegmator was larger,the lowest evaporator inlet temperature reached-73.8℃while the evaporation pressure was 280 kPa.After startup,the auto-cascade refrigeration cycle with dephlegmator can reach stable refrigeration temperature faster,the temperature drop rate of cryogenic chamber was faster,and the refrigeration temperature was lower.When the R1150/R600a mass fraction ratio was 0.3∶0.7,the evaporator inlet temperature reached-77.2℃,5.6℃lower than the traditional auto-cascade refrigeration cycle.With the increase of the mass fraction of low boiling point component,the cooling rates of both cycles were faster.However,the compressor exhaust temperature increased.The compressor discharge temperature of the conventional auto-cascade refrigeration cycle was 25.0—36.0℃lower than that of the auto-cascade refrigeration cycle with dephlegmator.

关 键 词：自复叠制冷 非共沸 混合工质 分凝器 开机动态特性 

分 类 号：TB66[一般工业技术—制冷工程]