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IIR document

Real-time energy-efficient operation of a dedicated mechanical subcooling based transcritical CO₂ heat pump water heater via multi-input single-output extreme seeking control.

Author(s) : CUI C., REN J., RAMPAZZO M., SONG Y., YIN X., CAO F.

Type of article: IJR article

Summary

In the field of transcritical CO₂ systems applied research, dedicated mechanical subcooling (DMS) is one of the most recently investigated and promising solutions, especially for space heating. However, this kind of system brings with it an intrinsic complexity, and to pursue effective and efficient operation, it requires suitable control and optimization strategies. The paper considers a combined transcritical CO₂ and R134a -based DMS system and depicts the benefits of using a Multi-Input-Single-Output (MIMO) Extremum Seeking Control (ESC) approach. The real-time optimization strategy was obtained through a Computer-Aided Control System Design (CACSD) tool, exploiting an ad hoc Dymola model of the DMS system that has been validated and tested by using experimental data. The performance of the proposed approach has been compared with standard solutions relying on physical correlations. The MISO-ESC strategy always performed better in terms of system Coefficient of Performance (COP), under both fixed and variable ambient temperature conditions. Finally, the influence of the different refrigerants in the combined DMS system was analyzed from both heating capacity and performance points of view.

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Pages: 76-89

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Details

Original title: Real-time energy-efficient operation of a dedicated mechanical subcooling based transcritical CO₂ heat pump water heater via multi-input single-output extreme seeking control.
Record ID : 30030449
Languages: English
Subject: Technology
Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 144
Publication date: 2022/12
DOI: http://dx.doi.org/10.1016/j.ijrefrig.2022.07.005

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Indexing

Themes: CO2;
Heat pumps techniques
Keywords: Transcritical cycle; CO2; R744; Heat pump; Water heater; Subcooling; Modelling; Simulation