Effects of water mal-distribution on thermostatic-expansion-valve stability and its controlled two-circuit evaporator performance

被引：10

作者：

Huang, Dong ^{[1
]}

Zhao, Rijing ^{[1
]}

Gong, Qinqin ^{[1
]}

Tang, Xueqiang ^{[1
]}

机构：

[1] Xi An Jiao Tong Univ, Sch Energy & Power Engn, Dept Refrigerat & Cryogen Engn, Xian 710049, Peoples R China

来源：

INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID | 2014年 / 48卷

基金：

中国国家自然科学基金;

关键词：

Water mal-distribution; Two-circuit evaporator; Stability; Heat transfer; HEAT-PUMP; FLOW; REFRIGERANT; SIMULATION; MIXTURE; SYSTEM;

D O I：

10.1016/j.ijrefrig.2014.08.011

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Effects of water mal-distribution on thermostatic-expansion-valve (TEV) stability and its controlled two-circuit evaporator performance were investigated experimentally and numerically. 7 sets of water mal-distribution were obtained with Circuit 2 water percentage (F-2) from 36.9% to 9.1%. Results showed that the TEV control-loop was stable with F-2 from 36.9% to 27.0%, and the overall evaporator capacity decreased by 3.4%. However, hunting occurred with F-2 from 27.0% to 9.1% due to the evaporator outlet superheat smaller than the TEV minimal stable signal (MSS), hence system parameters such as evaporator pressures and temperatures oscillated over time. Hunting introduced a sharp decrease in the refrigerant flowrate to the evaporator, thus the overall evaporator capacity decreased by 14.1%. With water mal-distribution rate increased, the decrease in overall evaporator capacity was mainly attributed to Circuit 2 with smaller overall heat transfer coefficient. (C) 2014 Elsevier Ltd and IIR. All rights reserved.

引用

页码：38 / 47

页数：10

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