Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/66698
Title: The influences of the operating characteristics of an electronic expansion valve (EEV) on the operational stability of an EEV controlled direct expansion air conditioning system
Authors: Xia, YD
Deng, SM 
Keywords: Operational stability
Sensor dynamics
Electronic expansion valve
Classical control theory
DX A/C system
PI settings
Issue Date: 2016
Publisher: Elsevier
Source: International journal of refrigeration, Sept. 2016, v. 69, p. 394-406 How to cite?
Journal: International journal of refrigeration 
Abstract: This paper reports on a study on the influences of the operating characteristics of a proportional integral (PI) controlled Electronic Expansion Valve (EEV) on the operational stability of a direct expansion (DX) air conditioning (A/C) system. Using the classical control theory, EEV's PI settings and time constant of EEV's temperature sensor were analyzed. The theoretical analysis results using the classical control theory were further verified experimentally using an experimental DX A/C system. The study results showed that a larger proportional or integral gain would lead to a high chance for the EEV evaporator control loop to become unstable, while slowing down the rate of degree of superheat (DS) signal transfer by increasing EEV's time constants may help mitigate system's operational instability. The results confirmed that the operating characteristics of an expansion valve in a refrigeration system could impact its operational stability.
URI: http://hdl.handle.net/10397/66698
ISSN: 0140-7007
EISSN: 1879-2081
DOI: 10.1016/j.ijrefrig.2016.06.008
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