A new model of mass flow characteristics in electronic expansion valves considering metastability
A new model of mass flow characteristics in electronic expansion valves considering metastability
复制标题
考虑亚稳态的电子膨胀阀质量流量特性新模型
DOI：
10.1016/j.ijthermalsci.2008.10.002
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发表时间：
2009-06
影响因子：
4.5
通讯作者：
Chen Zhijiu
中科院分区：
文献类型：
--
作者：
Chen Liang;Liu Jinghui;Chen Jiangping;Chen Zhijiu
This paper presents an experimental study on the mass flow characteristics of electronic expansion valves in a wide operating condition range. It was found that flow choking always occurs under common operating conditions in refrigeration systems. Based on metastability in EEVs, a new model predicting mass flow rate was proposed under flow choking conditions. Different from the conventional models using Bernoulli equation which employed downstream pressure at the EEV exit and a corrected mass flow coefficient, the present model considered metastable liquid flow caused by rapid depressurization, and employed single-phase incompressible flow coefficient and metastable pressure at the throat. An empirical correlation of the metastable pressure, based on the experimental data for R22 and its substitutes, R407C and R410A, was developed in a power law form of dimensionless parameters including upstream operating parameters and refrigerant thermophysical properties and throat area. The predictions of the present model were found to be in good agreement with the measured data, and approximately 95% of the measured data fall within a relative deviation of ±7.0%. The comparison with a prior model shows that, in terms of flashing mechanism application and predicting accuracy, the present model is better than the conventional model without considering metastability.
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影响因子：
3.2
作者：
Jinghui Liu;Jiangpin Chen;Q. Ye;Zhi-jiu Chen
通讯作者：
Jinghui Liu;Jiangpin Chen;Q. Ye;Zhi-jiu Chen
影响因子：
2.2
作者：
J. Simões-Moreira
通讯作者：
J. Simões-Moreira
影响因子：
--
作者：
Yong Chan Kim;D. O’Neal
通讯作者：
Yong Chan Kim;D. O’Neal
影响因子：
10.4
作者：
Chuan Zhang;Shanwei Ma;Jiangpin Chen;Zhi-jiu Chen
通讯作者：
Chuan Zhang;Shanwei Ma;Jiangpin Chen;Zhi-jiu Chen
影响因子：
6.4
作者：
C. Aprea;R. Mastrullo
通讯作者：
C. Aprea;R. Mastrullo