Further study on the inherent operating characteristics of a variable speed direct expansion air conditioning system

Zhao Li, Xiangguo Xu, Shiming Deng, Dongmei Pan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

29 Citations (Scopus)


Further to a previous experimental study on the inherent operational characteristics of an experimental variable speed (VS) direct expansion (DX) air conditioning (A/C) system at only two inlet air states, an experimental study using the same experimental VS DX A/C system at six different inlet air states to the DX A/C system has been carried out and the study results are presented in this paper. The results suggested that different inlet air states to a DX A/C system influenced the operational characteristic of the system, in terms of the Inherent Correlation (IC) between its output total cooling capacity (TCC) and Equipment sensible heat ratio (SHR). Therefore, a further data processing method was developed using regression, by which the ICs of the VS DX A/C system at non-test inlet air states can be predicted with adequate accuracy. This has therefore paved way to developing advanced control strategies for indoor thermal environment (i.e., air temperature and humidity) based on the known or predicted ICs within the possible operating ranges of inlet air temperature and humidity to the DX A/C system, for better control accuracy and energy efficiency.
Original languageEnglish
Pages (from-to)206-215
Number of pages10
JournalApplied Thermal Engineering
Issue number1-2
Publication statusPublished - 1 May 2014


  • Direct expansion air-conditioning
  • Inherent correlation
  • Sensible heat ratio
  • Total cooling capacity
  • Variable speed

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Industrial and Manufacturing Engineering

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