摘要
本文针对间歇工作的高功率电子设备对冷却系统的特殊需求,研制了一种以蒸气压缩制冷循环为基础的复叠式储能相变冷却系统,理论分析了系统的工作原理和工质选择原则,模拟计算了储能器的运行特性,通过实验测量了系统启动和稳定运行时的冷却能力和运行性能。结果表明:机械泵启动时,系统压力先降低后升高,幅值为30 kPa,热源启动时,系统压力先升高后降低并维持稳定,系统的主要压降发生在冷却器中;储液器在热源启动时,能有效储存系统多余的工质,并间接控制冷却器内的相变温度和压力;储能器在系统运行过程中,满足系统换热需求并维持机械泵入口5℃的过冷度,设计合理;系统的冷却能力随运行时间逐渐降低,当平均热负荷超过10 kW时,系统能稳定运行5 min,满足课题的设计要求。
To meet the cooling system requirements of intermittent high-power electronic equipment,we investigated a cascade cooling system with a phase-change energy storage that is based on a traditional R134a vapor-compression cycle cascaded with a mechanical pump cycle. The operating principle and refrigerant features were theoretically analyzed and the operating characteristics of an energy storage device were reviewed in this research. The cooling capacity and operating performance of the system were experimentally measured during its start-up and stable operation. The main conclusions drawn from this study were that at the startup stage of the mechanical pump,the system pressure first decreased and then increased by an amplitude of 30 kPa. When the heat source started up,the system pressure first increased then decreased and remained stable. It was determined that the accumulator can effectively store the excess working medium of the system and indirectly control the phase change temperature and pressure in the heat sink. Furthermore,the energy storage device can maintain a mechanical pump inlet super cooling degree of 5 ℃ in the system operation process. The energy storage device can also meet the demand of the heat load and maintain 5 ℃ of super cooling before the working fluid is interred in the mechanical pump,indicating that this device was reasonably designed and its operation stable. Although the cooling capacity of the refrigeration system reduced gradually with the running time,it was able to run for 5 minutes with a heat load of more than 10 kW,thus meeting the design requirements of the subject.
作者
袁俊飞
王林
谈莹莹
焦永刚
Yuan Junfei;Wang Lin;Tan Yingying;Jiao Yonggang(Institute of Heat Pump and Air Conditioning Technology,Henan University of Science and Technology,Luoyang,471023,China;School of Mechanical Engineering,Shijiazhuang Tiedao University,Shijiazhuang,050043,China)
出处
《制冷学报》
CAS
CSCD
北大核心
2020年第1期124-130,共7页
Journal of Refrigeration
基金
国家自然科学基金(U1504524,51706061,51876055)资助项目~~
关键词
制冷系统
相变
储能
热负荷
refrigeration system
phase-change
energy storage
heat load
作者简介
通信作者:袁俊飞,女,博士,河南科技大学土木工程学院,(0379)64270576,E-mail:yuanjf1103@163.com。研究方向:大功率电子设备冷却系统,梯级能量利用和节能技术。
