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

Yudong Xia, Shiming Deng

Research output: Journal article publicationJournal articleAcademic researchpeer-review

13 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)394-406
Number of pages13
JournalInternational Journal of Refrigeration
Publication statusPublished - 1 Sep 2016


  • Classical control theory
  • DX A/C system
  • Electronic expansion valve
  • Operational stability
  • PI settings
  • Sensor dynamics

ASJC Scopus subject areas

  • Building and Construction
  • Mechanical Engineering

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