A comparison of two extremum seeking control strategies based on simulation and laboratory tests for heat pump air conditioning. (28th May 2021)

• Record Type: Journal Article
• Authors: Zhao, Zhongfan; Salsbury, Timothy I.; House, John M.; Alcala, Carlos F.; Li, Yaoyu
• Is Part Of: Science and technology for the built environment. Volume 27:Number 5(2021)
• Page Start: 641
• Page End: 655
• Publication Date: 2021-05-28
• Subjects: Heating -- Periodicals; Ventilation -- Periodicals; Air conditioning -- Periodicals; Refrigeration and refrigerating machinery -- Periodicals; Indoor air quality -- Periodicals; Indoor air quality; Air conditioning; Heating; Refrigeration and refrigerating machinery; Ventilation; Periodicals; 697
• DOI: 10.1080/23744731.2020.1806625
• Languages: English
• ISSNs: 2374-474X

Abstract

Abstract : Extremum seeking control (ESC) strategies are a class of model-free real-time optimization techniques. Because conventional ESC (CON-ESC) based on dither demodulation has relatively slow convergence, various alternative forms of ESC have been proposed to improve the transient performance. The purpose of this study is to compare a recently proposed input–output correlation ESC (IOC-ESC) strategy with that of CON-ESC for an air-source heat pump (ASHP) application. The ESC performance is evaluated under different tuning parameters, initial conditions, and measurement noise using a Modelica simulation model of the ASHP. Simulation results show that the IOC-ESC is simpler to tune, has less sensitivity to tuning parameter and initial condition, and converges more quickly than the CON-ESC. The performances of the two ESC algorithms are affected by measurement noise, but the IOC-ESC still achieves faster convergence under the measurement noise levels being evaluated. An experimental comparison is also made between the IOC-ESC and CON-ESC using a mini-split air conditioning system. The experimental results of both single-input and two-input ESC show that the IOC-ESC converges more quickly than the CON-ESC.