Experimental research on the pull-down performance of an ejector enhanced auto-cascade refrigeration system for low-temperature freezer
Experimental research on the pull-down performance of an ejector enhanced auto-cascade refrigeration system for low-temperature freezer
复制标题
低温冷冻库喷射增强自动复叠制冷系统下拉性能实验研究
DOI：
10.1016/j.energy.2018.05.205
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发表时间：
2018-08
期刊：
影响因子：
9
通讯作者：
Jianlin Yu
中科院分区：
文献类型：
--
作者：
Tao Bai;Gang Yan;Jianlin Yu
本文介绍了一种用于低温冷冻机的喷射器增强自复叠制冷循环的下拉性能的实验研究。比较了基于喷射增强循环和传统自复叠制冷循环的制冷机的下拉性能。此外，研究了喷射器和基于新循环的冷冻机在不同混合物浓度和节流阀开度下的运行特性。结果表明，与传统系统相比，喷射器增强系统具有更短的降温时间和更低的冷冻空气温度。在-40 °C的理想冻结温度下，压缩机的下拉时间节省了34.4%，压缩机能耗降低了29.6%，压升比和引射比的最大时间平均值分别达到2.854和1.340，由于引射器的有效升压作用，压气机的时均压缩比降低了11.6%。以最短的下拉时间为目标，提出了R23/R134 a的最佳质量分数比为30%/70%。该研究为进一步提高低温冷柜自复叠制冷系统的性能提供了指导。
This paper presents an experimental investigation on pull-down performance of an ejector enhanced auto-cascade refrigeration cycle for low-temperature freezer application. The pull-down performances of the freezer established on the ejector enhanced cycle and conventional auto-cascade refrigeration cycle were compared. Additionally, operation behaviors of the ejector and the new cycle based freezer at different mixture concentrations and throttle valve openings were investigated. The results indicated that ejector enhanced system exhibited shorter pull-down time and lower freezer air temperature after continuous operation in comparison with the conventional system. And the pull-down time was saved by 34.4% and the energy consumption of the compressor was reduced by 29.6% at the desired freezing temperature of −40 °C.The largest time average values of the pressure lift ratio and entrainment ratio reached up to 2.854 and 1.340, and the time average compression ratio of the compressor was reduced by 11.6% due to the effective pressure lifting effect of the ejector. The optimal mass fraction ratio of 30%/70% for the mixture R23/R134a was proposed with respect to the shortest pull-down time. This research may offer good guidelines for further improving the performance of the auto-cascade refrigeration system in low-temperature freezer.
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DOI：
10.1016/s0140-7007(01)00110-4
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DOI：
10.1016/j.ijrefrig.2017.01.024
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International Journal of Refrigeration-revue Internationale Du Froid
影响因子：
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