| 摘要: |
| 重力再循环制冷系统相比于普通直接膨胀制冷系统具有蒸发温度越低，效率优势越显著，以及可获取更低库内温度。本文结合重力再循环系统工作原理重新绘制了匹配的压焓图，将重力再循环系统的热力循环过程在压焓图上分两个循环进行分析，通过分析制冷剂流动过程中的流动阻力，得到系统中各部分压力变化趋势，并通过搭建重力再循环制冷系统进行实验研究，结果表明，获得的各状态点的压力与理论分析结果较为吻合。最后与直接膨胀供液制冷系统的运行结果对比，在不同蒸发温度下重力再循环制冷系统的COP最多可提升19%，且在-30℃温度条件下，COP达到1.07。 |
| 关键词: 重力再循环制冷系统 直接膨胀制冷系统 理论分析 压焓图 |
| DOI： |
| Received:December 17, 2020Revised:July 11, 2021 |
| 基金项目:本文受湛江市科技攻关专题项目(2020B01157及2019A01043);南方海洋科学与工程广东省实验室(湛江) 项目(ZJW-2019-01);广东省基础与应用基础研究基金项目(2019A1515111066)资助。 |
|
| Theoretical Analysis and Experimental Study of Gravity Recirculation Refrigeration System |
|
Ruan Jianwen1, Zhang Cheng1, Li Min1,2, Ye Biao1,2
|
| (1.School of Mechanical and Power Engineering, Guangdong Ocean University;2.Guangdong Laboratory of Southern Ocean Science and Engineering(Zhanjiang)) |
| Abstract: |
| The gravity recirculation refrigeration system has two significant advantages compared with the ordinary direct-expansion refrigeration system. The lower the evaporation temperature, the clearer the efficiency advantage, and the lower temperature obtained in the chamber. In this study, the pressure enthalpy diagram of a gravity recirculation system is redesigned based on the principle of a gravity recirculation system, and the thermodynamic cycle of a gravity recirculation system is divided into two cycles for analysis. By analyzing the flow resistance in the refrigerant flow process, the variation trend of the pressure in each part of the system is obtained. The experimental results show that the pressure at each state point is identical to the theoretical analysis results. The coefficient of performance (COP) of the gravity recirculation refrigeration system can be improved by up to 19% at different evaporation temperatures compared with the experimental results of the ordinary direct-expansion refrigeration system, and the COP reaches 1.07 at ?30 °C. |
| Key words: gravity recirculation refrigeration system direct expansion refrigeration system theoretical analysis pressure-enthalpy diagram |
