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Experimental investigation on a -40 °C low-temperature freezer using ejector-expansion refrigeration system
International Journal of Refrigeration ( IF 3.9 ) Pub Date : 2020-06-18 , DOI: 10.1016/j.ijrefrig.2020.06.010
Yu Lu , Tao Bai , Jianlin Yu

The ejector-expansion freezer refrigeration system (ERS) has been proposed to recover part of the expansion work in the throttling process and improve cycle efficiency. In this paper, the performance characteristics of a -40 °C low-temperature freezer adopted with the standard ERS are experimentally investigated under various operating conditions, and several important parameters are also examined in detail. Additionally, the performance of the freezer prototype is compared between using the ERS and a conventional vapor compression freezer refrigeration system (CRS). The experimental results show that the lower evaporation temperature can be obtained by ERS, the pressure lift ratio of ejector can reach more than 1.25, the compressor compression ratio and power consumption are reduced due to the effective pressure lifting effect of the ejector. Furthermore, when the ambient temperature is 20/25/32 °C, the maximum refrigeration capacity and COP of the ERS based prototype can be improved by 17.0% and 15.9%, respectively. Meanwhile, the energy consumption of ERS can be reduced by 6.2%, 21.7% and 38.9% compared to that of the CRS based prototype, respectively. This validate that the ERS offers a significant energy-saving potential to low-temperature freezers.



中文翻译:

喷射器-膨胀制冷系统对-40°C低温冷冻机的实验研究

已经提出了喷射器-膨胀冷冻器制冷系统(ERS),以回收节流过程中的部分膨胀工作并提高循环效率。在本文中,对在不同操作条件下采用标准ERS的-40°C低温冰箱的性能特征进行了实验研究,并对一些重要参数进行了详细检查。此外,在使用ERS和传统的蒸气压缩式冷冻机制冷系统(CRS)之间比较了冷冻机原型的性能。实验结果表明,通过ERS可获得较低的蒸发温度,喷射器的升压比可达到1.25以上,由于喷射器的有效升压效果,降低了压缩机的压缩比和功耗。此外,当环境温度为20/25/32°C时,基于ERS的原型的最大制冷量和COP可以分别提高17.0%和15.9%。同时,与基于CRS的原型相比,ERS的能耗可分别降低6.2%,21.7%和38.9%。这证明ERS为低温冰柜提供了巨大的节能潜力。

更新日期:2020-08-09
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