二氧化碳复叠式制冷系统实验研究

摘要

In this paper a novel CO2 based cascade refrigeration system is proposed and experimentally investigated. The system used natural CO2 as working fluid. The cascade system is consisted of a High Temperature Cycle (HTC) and a Low Temperature Cycle (LTC). The two parts are connected by an internal heat exchanger. This is the first cascade refrigeration system proposed. Based on the CO2 solid-gas two phase sublimation flow, stable heat transfer and refrigeration can be achieved. In the present paper the feasibility and fundamental optimizations are discussed. Detailed information on the system behavior and the parameters are also present in the paper.%　　本研究提出了一种基于CO2固气两相升华流动的复叠式制冷系统.系统采用环保的天然工质CO2作为冷媒.复叠式制冷系统由高温循环(HTC：High Temperature Cycle)和低温循环(LTC：Low Temperature Cycle)二个部分构成.两部分用一个中间换热器相连接.本文提出 CO2两级复叠式循环概念并进行了实验测试，利用 CO2固气两相升华流动潜热潜力，可以同时实现低于-56.6℃的制冷和80℃以上的制热.通过实验和理论计算，两级系统成功地同时实现了以上功能.此外，本文还总结了基本实验特性并做了相应的系统优化设计和分析.