CAJ | 학술논문

在复叠制冷实验台上对由CO_2/R290组成的不同配比的二元混合制冷剂进行了低温循环性能实验.实验结果表明,随着CO_2含量增大,二元混合物的压比减小,制冷量增大,耗功减少,COP增加,制冷速率增大.但随着CO_2含量增大,二元混合物的排气温度也升高,当CO_2在混合物中的组分达到71%时,蒸发温度为-61℃时,压缩机的排气温度接近115℃.因此,混合物中CO_2含量不宜超过71%.混合物中R290降低了CO_2凝固点温度,同时也降低了CO_2较高的冷凝压力,对扩展CO_2在低温区域的应用很有益处.
재복첩제랭실험태상대유CO_2/R290조성적불동배비적이원혼합제랭제진행료저온순배성능실험.실험결과표명,수착CO_2함량증대,이원혼합물적압비감소,제랭량증대,모공감소,COP증가,제랭속솔증대.단수착CO_2함량증대,이원혼합물적배기온도야승고,당CO_2재혼합물중적조분체도71%시,증발온도위-61℃시,압축궤적배기온도접근115℃.인차,혼합물중CO_2함량불의초과71%.혼합물중R290강저료CO_2응고점온도,동시야강저료CO_2교고적냉응압력,대확전CO_2재저온구역적응용흔유익처.
The experiment on concentration ratio of CO_2/R290 in the low-temperature circuit of a cascade refrigeration system was conducted in our study.The results show that the refrigeration capacity,the CO_2 and the refrigeration rate increased while the pressure ratio and the power input decreased with the increase in the CO_2 concentration ratio.However,the increase in the CO_2concentration ratio resulted in the increase in the discharge temperature,and the discharge temperature of the compressor was up to115℃ when the concentration ratio of CO_2 was 71% and the evaporating temperature was-61 ℃.It is suggested that the concentration ratio of CO_2 should not exceed 71%.In addition,R290 in the mixture could reduce the freezing point and the condensing pressure of CO_2.