Impacts of Variations in Air Conditioning System Set-Point Temperature on Room Conditions and Perceived Thermal Comfort

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


This paper describes research carried out to investigate specific features of the operation of air-conditioning systems of University buildings in Hong Kong. Changes in thermostat set points were introduced so as to investigate the impact on conditions experienced and were made at 5 minute intervals over a total investigation period of 6 days. Concurrently with the environmental measurements occupant surveys took place, the subjects being a group of postgraduate students. Some 912 sets of survey data were accumulated and this was used in conjunction with environmental data to compare actual and predicted sensation votes. Comparisons of sensation votes and preference votes were also carried out. Main findings were: that a significant degree of temperature variation occurred across the rooms despite the sets of controllers being used in conjunction with each other to effect changes; that the relationship between actual and predicted sensation votes exhibited a degree of variation between days even with the same occupants and that occupants tended to vote over a wider range than was predicted; and that there was a clear (as expected) inverse relationship between actual sensation and preference voting.
Original languageEnglish
Title of host publicationProceedings of the 9th Windsor Conference
Subtitle of host publicationMaking Comfort Relevant
EditorsLuisa Brotes, Susan Roaf, Fergus Nicol, Michael Humphreys
PublisherNCEUB - Network for Comfort and Energy Use in Buildings
Number of pages12
ISBN (Electronic)9780992895730
Publication statusPublished - 2016
Event9th International Windsor Conference: Making Comfort Relevant - Cumberland Lodge, Windsor, United Kingdom
Duration: 7 Apr 201610 Apr 2016
Conference number: 9 (Link to Conference Website)


Conference9th International Windsor Conference
Country/TerritoryUnited Kingdom
Internet address


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