低温空气制冷速冻系统性能的实验研究

对使用空气动压轴承的升压式空气制冷速冻系统进行了实验研究,分析了压气机进口压力、散热器冷边风量及回热器对系统性能的影响。实验结果表明:增大压气机进口压力和散热器冷边空气流量均可降低涡轮出口温度,提高系统制冷量;系统COP随着压气机进口压力的升高而增大,但是增大幅度逐渐减少;系统增加回热器后,涡轮出口温度最多可降低约67%,系统制冷量和COP最多约可增加45.5%,其中涡轮出口温度最低约可降至-50℃,系统COP最大可达0.7左右。

Experimental study of air cycle refrigeration system for quick-freezing

In this paper,a series of experiments for the forward bootstrap air cycle refrigeration systems with dynamic bearing were performed.The factors affecting the performance of the air cycle refrigeration system were analyzed.The experimental results show that the turbine outlet temperature reduces with the increase in the inlet pressure of the bootstrap compressor and the cold side air flow rate of the air cooler.However,both the system refrigeration capacity and COP increase with that when the inlet pressure of the bootstrap compressor is too high,the system COP slightly increases and even decreases.The performance of the air cycle refrigeration system with heat regenerator is better than that of the system without heat regenerator under the same working condition.The maximum COP and refrigeration capacity of the regeneration system can be increased by 45.5% comparing with the system without heat regenerator,and the turbine outlet temperature can reach as low as-50℃ with the maximum system COP of 0.7 level.