Summary
Modern multi-evaporator air-conditioners (MEACs) incorporate variable-speed compressors and variable-opening expansion valves as the actuators for improving cooling performance and energy efficiency. These actuators have to be properly feedback-controlled; otherwise the systems may exhibit even poorer performance than the conventional machines which use fixed-speed compressors and conventional expansion valves. In this paper, feedback controller design for the MEAC system is first addressed through experimental identification. The identification produces a low-order, linear model suitable for controller design. The feedback controller employed is multi-input-multi-output-based and possesses a cascade structure for dealing with the fast and slow dynamics in the system. To determine appropriate control parameters, conditions that establish the stability for the cascade design are given. Due to the deficiency in control inputs, the proposed control structure exhibits steady-state errors in the superheat responses which in turn can produce unacceptable steady-state superheats. To resolve this issue, the reference superheat settings are determined via an optimization procedure so that the resultant steady-state superheats become acceptable. The control experiments indicate that the proposed controller can successfully regulate the indoor temperatures and maintain the steady-state superheat temperatures at acceptable levels.
Available documents
Format PDF
Pages: 1374-1385
Available
Public price
20 €
Member price*
Free
* Best rate depending on membership category (see the detailed benefits of individual and corporate memberships).
Details
- Original title: Identification and control of multi-evaporator air-conditioning systems.
- Record ID : 2008-0314
- Languages: English
- Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 30 - n. 8
- Publication date: 2007/12
Links
See other articles in this issue (17)
See the source
-
Numerical investigation of flow and heat transf...
- Author(s) : LAI X., LIU N., YAN K., et al.
- Date : 2015/08/16
- Languages : English
- Source: Proceedings of the 24th IIR International Congress of Refrigeration: Yokohama, Japan, August 16-22, 2015.
- Formats : PDF
View record
-
Investigation of flow and heat transfer for a s...
- Author(s) : KUMLUTAS D., KARADENIZ Z. H., KURU F.
- Date : 2013/03
- Languages : English
- Source: Applied Thermal Engineering - vol. 51 - n. 1-2
View record
-
The research of the high-efficient heat exchang...
- Author(s) : WU L. Z., GUI X.
- Date : 2007/08/21
- Languages : English
- Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
- Formats : PDF
View record
-
Investigation of air-side fouling of split syst...
- Author(s) : YUILL D., HU Y.
- Date : 2021/05
- Languages : English
- Source: 2021 Purdue Conferences. 18th International Refrigeration and Air-Conditioning Conference at Purdue.
- Formats : PDF
View record
-
Simulation des Betriebsverhaltens von Splitgerä...
- Author(s) : KNABE G., LE H. T.
- Date : 2001/12
- Languages : German
- Source: KI Luft Kältetech. - vol. 37 - n. 12
View record