Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/77600
Title: Effects of superheat nonlinearity on the operational stability of a direct expansion (DX) air conditioning (A/C) system
Authors: Xia, Y 
Du, J 
Deng, S 
Keywords: Air conditioning system
Direct expansion
Operational stability
Superheat nonlinearity
Issue Date: 2017
Publisher: Elsevier
Source: Energy procedia, 2017, v. 142, p. 1854-1859 How to cite?
Journal: Energy procedia 
Abstract: The paper reports a study on examining the influences of superheat nonlinearity on the operational stability of a direct expansion (DX) air conditioning (A/C) system. Using an experimental DX A/C system, the static nonlinearity of the electronic expansion valve (EEV) and superheat nonlinearity of the evaporator exhibited under different operating conditions were obtained. A first-order plus dead time (FOPDT) model was used to characterize the dynamic responses of the evaporator when the experimental system was operated at different compressor speeds and evaporating temperatures. Using Nyquist stability criterion, the effects of superheat nonlinearity on the system operational stability were theoretically analysed. The study results showed that a higher chance to instability would be resulted in when the system was operated at a smaller EEV's opening, a lower compressor speed or evaporating temperature.
Description: 9th International Conference on Applied Energy, ICAE 2017, Cardiff, United Kingdom21-24 Aug 2017
URI: http://hdl.handle.net/10397/77600
EISSN: 1876-6102
DOI: 10.1016/j.egypro.2017.12.575
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