A study on the real time optimal control method for heat rejection pressure of a CO2 refrigeration system with an internal heat exchanger

被引:22
作者
Kim, Mo Se [1 ]
Shin, Chang Soo [1 ]
Kim, Min Soo [1 ]
机构
[1] Seoul Natl Univ, Dept Mech & Aerosp Engn, Seoul 151744, South Korea
来源
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID | 2014年 / 48卷
基金
新加坡国家研究基金会;
关键词
Carbon dioxide; Refrigeration; Control; Heat rejection pressure; Optimum control; Gas cooler pressure;
D O I
10.1016/j.ijrefrig.2014.09.014
中图分类号
O414.1 [热力学];
学科分类号
摘要
Carbon dioxide (CO2) is one of the replacements of the synthetic refrigerants whose properties are good as a refrigerant with no ozone depletion and a very little global warming effect. However, its low critical temperature makes a CO2 refrigeration system to form transcritical cycle and determination of an optimal heat rejection pressure becomes an important problem for the best performance. Until now, number of studies have been published which correlate preliminarily obtained data map with some major operating parameters. In this study, a generally usable real time optimal control method is introduced. This real time optimal control method does not require preliminarily obtained correlations and makes the system operate in a nearly optimal region. Additionally, its limitations which produce undesirable errors and bias of controlled value were also treated in this paper. Three causes of errors were discussed and it is helpful to improve the control method. (C) 2014 Elsevier Ltd and IIR. All rights reserved.
引用
收藏
页码:87 / 99
页数:13
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