A Thermal Comfort based Controller for a Direct Expansion Air Conditioning System

Huaxia Yan, Jiajia Niu, Shiming Deng

Research output: Journal article publicationConference articleAcademic researchpeer-review

2 Citations (Scopus)


For building HVAC systems, better indoor thermal comfort control and higher energy efficiency could be achieved using a thermal comfort index as the controlled variable instead of air temperature. Although there can be various simplification approaches, indoor air humidity has been commonly assumed constant or left uncontrolled. Neglecting the importance of indoor humidity control would adversely affect the control performance of an air conditioning system. In addition, it is difficult to control local air velocity in the vicinity of a user. Therefore, either a constant local air velocity or an air velocity varying to a preset pattern was assumed in a thermal comfort model. In this paper, a thermal comfort based controller is developed and reported. Controllability tests were carried out which showed that better energy efficiency of the DX A/C system could be achieved when a higher local fan speed was used.
Original languageEnglish
Pages (from-to)1817-1822
Number of pages6
JournalEnergy Procedia
Publication statusPublished - 1 Jan 2017
Event9th International Conference on Applied Energy, ICAE 2017 - Cardiff, United Kingdom
Duration: 21 Aug 201724 Aug 2017


  • air conditioning
  • air velocity
  • control
  • direct expansion
  • Thermal comfort

ASJC Scopus subject areas

  • General Energy


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