Influences of operating parameters on performance of bi-evaporator compression/ejection refrigeration system

doi:10.11949/j.issn.0438-1157.20160618

Abstract

Abstract:

The influences of operating parameters (condenser inlet water temperature, high-temperature evaporator inlet water temperature and low-temperature evaporator inlet water temperature) on the performance of bi-evaporator compression/ejection refrigeration cycle (BCERC) and two-phase ejector are experimentally investigated. Results show that the ejector entrainment ratio decreases with the rising of condenser inlet water temperature and high-temperature evaporator inlet water temperature, but rises with the increasing of low-temperature evaporator inlet water temperature. The pressure lift ratio of ejector increases with the rising of condenser inlet water temperature and high-temperature evaporator inlet water temperature, but decreases with the rising of low-temperature evaporator inlet water temperature. The condenser inlet water temperature and the high-temperature evaporator inlet water temperature have significant influences on the performance of the BCERC system. However, the low-temperature evaporator inlet water temperature has little effects on the performance of the BCERC system. As the condenser inlet water temperature decreases 5℃, the COP increases 0.44. As the high-temperature evaporator inlet water temperature increases 2℃, the increase of system COP is 0.16. The results can be references for the design and operation of the BCERC system.

Key words: operating parameters, two-phase flow, ejector, compression/ejection refrigeration, performance

摘要：

实验研究了操作参数（冷凝器进水温度、高温蒸发器进水温度和低温蒸发器进水温度）对双蒸发压缩/喷射制冷系统及两相喷射器性能的影响。结果显示，喷射器引射系数随冷凝器进水温度和高温蒸发器进水温度的升高而减小，随低温蒸发器进水温度的升高而增大；喷射器压升比随冷凝器进水温度和高温蒸发器进水温度的升高而增大，随低温蒸发器进水温度的升高而减小。冷凝器进水温度和高温蒸发器进水温度对制冷系统性能的影响较大，而低温蒸发器进水温度对制冷系统性能的影响较小。其中，冷凝器进水温度每降低5℃，制冷系统COP增加0.44；高温蒸发器进水温度每升高2℃，制冷系统COP增加0.16。结果可供双蒸发压缩/喷射制冷系统的设计和运行参考。

关键词: 操作参数, 两相流, 喷射器, 压缩/喷射制冷, 性能

CLC Number:

TB66

GENG Lihong, LIU Huadong, WEI Xinli, WANG Zhenzhen, SHAO Long. Influences of operating parameters on performance of bi-evaporator compression/ejection refrigeration system[J]. CIESC Journal, 2017, 68(3): 1146-1154.

耿利红, 刘华东, 魏新利, 王珍珍, 邵龙. 操作参数对双蒸发压缩/喷射制冷系统性能的影响[J]. 化工学报, 2017, 68(3): 1146-1154.

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