Enhancing Vapor Compression Refrigeration Systems Efficiency via Two-Phase Length and Superheat Evaporator MIMO Control

The present investigation focuses on enhancing the efficiency of a vapor compression refrigeration system (VCRS) by proposing a Multiple Input Multiple Output (MIMO) control strategy based on the evaporator’s two-phase length and superheat temperature. A moving boundary dynamic model for the VCRS is...

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Bibliographic Details
Published in:Processes 2024-08, Vol.12 (8), p.1600
Main Authors: Estrada, Antonio, Córdova-Castillo, Leonardo, Piedra, Saúl
Format: Article
Language:English
Subjects:
Actuation
Compression
Controllers
Cooling
Cost control
Dynamic models
Efficiency
Energy consumption
Evaporation
Evaporators
Gas expanders
Heat
MIMO (control systems)
Parameters
Refrigeration
Vapor compression refrigeration
Vapors
Variables
Velocity
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Summary:The present investigation focuses on enhancing the efficiency of a vapor compression refrigeration system (VCRS) by proposing a Multiple Input Multiple Output (MIMO) control strategy based on the evaporator’s two-phase length and superheat temperature. A moving boundary dynamic model for the VCRS is implemented using the Thermosys Matlab Toolbox. The study analyzes the influence of actuation parameters, specifically compressor speed and expansion valve opening, on control parameters, namely two-phase length and superheat temperature. A comprehensive analysis based on the first and second laws of thermodynamics is conducted across a wide range of operating conditions. Simulation results demonstrate that two-phase length can be effectively utilized as a control parameter by selecting operating points that maximize the system efficiency. Additionally, the study reveals that extending the evaporator’s two-phase length to 80–90% of its limit increases system efficiency, enabling a reduction in compressor speed while maintaining the cooling capacity.
ISSN:2227-9717
2227-9717
DOI:10.3390/pr12081600