r744

Experimental study on R744 / R290 in low-temperature circuit of cascade refrigeration system

复叠式制冷系统低温环路制冷剂R744（CO2）/R290的实验研究

The temperature glide of zeotropic refrigerant mixture of R744 / R717 was studied .

研究了非共沸环保混合制冷剂（R744/R717）的温度滑移。

The design of a - 40 ℃ freezer using zeotropic refrigerant mixture of R744 / R717 was carried out .

完成了采用非共沸环保混合制冷剂（R744/R717）-40℃低温冷柜的仿真与优化设计。

In this paper , the author investigates the characteristics of carbon dioxide ( R744 ) - based air conditioning system and the heat transfer performance of its heat transfer components both experimentally and theoretically . A new wavy-perforated plate-and-fin surface is developed .

本文作者对二氧化碳（R744）空调系统及其部分传热元件的性能进行了实验和理论研究。

It is shown that the - 40 ℃ freezer using zeotropic refrigerant mixture of R744 / R717 has high COP of 0.71 while keeping the compressing ratio less than 8 . It is a promising refrigeration system .

结果表明：采用非共沸环保混合制冷剂（R744/R717）-40℃低温冷柜自然复叠制冷系统在保持压缩比小于8的同时能获得COP值高达0.71，是一个有发展前途的制冷系统。

And the experiment system is built . With the reverse-Brayton cycle , the comparing tests are conducted for the mixture of R290 / R152a / R600a and the mixture of R744 / R600a .

搭建了实验台，对由R290R152aR600a组成的混合物和由R744R600a组成的混合物，应用于逆向布莱顿循环，进行了对比实验。