期刊
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
卷 48, 期 -, 页码 87-99出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrefrig.2014.09.014
关键词
Carbon dioxide; Refrigeration; Control; Heat rejection pressure; Optimum control; Gas cooler pressure
资金
- Industrial Strategic Technology Development Program - Ministry of Trade, Industry Energy [10039312]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT AMP
- Future Planning [2013R1A2A1A01014589]
- Brain Korea 21 Plus program
- Knowledge-based Environmental Service (Waste to Energy) Human Resource Development Project - Ministry of Environment and Institute of Advanced machinery and Design (IAMD) [YL-WE-13-002]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10039312] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2007-0056945, 2013R1A2A1A01014589, 2001-0036873] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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.
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