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本研究提出了一种基于CO_2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CO_2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 TemperatureCycle)二个部分构成。两部分用一个中间换热器相连接。本文提出CO_2两级复叠式循环概念并进行了实验测试,利用CO_2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。
In this study, a cascade refrigeration system based on CO_2 solid-gas two-phase sublimation flow was proposed. The system uses environmentally friendly natural refrigerant CO_2 as a refrigerant. Cascade refrigeration system by the high temperature cycle (HTC: High Temperature Cycle) and low temperature cycle (LTC: Low TemperatureCycle) composed of two parts. The two parts are connected by an intermediate heat exchanger. In this paper, the conception of CO 2 two-stage cascade circulation is proposed and tested experimentally. By utilizing the latent heat potential of sublimation of CO_2 solid-gas two phase, the cooling below -56.6 ℃ and the heating above 80 ℃ can be achieved simultaneously. Through experimental and theoretical calculations, the two-stage system successfully achieved the above functions simultaneously. In addition, this article also summarizes the basic experimental characteristics and made the corresponding system optimization design and analysis.