Dynamic evaluation method for indoor thermal environmental acceptability using P-R chart

Masanari Ukai, Tatsuo Nobe

Research output: Chapter in Book/Report/Conference proceedingConference contribution


This study was conducted to characterise thermal environmental acceptability for various air-conditioning systems. The authors developed a new thermal comfort index called a P-R chart using the concepts of "provided temperature" and "required temperature" for use in evaluating uniform, high-quality indoor thermal environments and non-uniform, unsteady thermal environments. In this study, first, the authors surveyed the required temperature distribution of workers. Then they surveyed indoor thermal environmental stabilities in the four offices during the summer with different air-conditioning systems to calculate provided temperature distribution. Finally, the indoor thermal acceptability in offices was evaluated using the P-R chart. The results showed that the convective air-conditioning systems caused wide temporal and spatial variations in the thermal environment. Therefore, in buildings with convective air-conditioning systems, even if the planar average thermal environment is categorised as comfortable, it is presumed that workers sensitive to cold or heat will complain of discomfort more frequently than those in buildings with radiant air-conditioning systems and floor-supply displacement HVAC systems, because the probability of workers sitting in cold- or hot-spot areas is higher in the former case.

Original languageEnglish
Title of host publicationProceedings of 10th Windsor Conference
Subtitle of host publicationRethinking Comfort
EditorsFergus Nicol, Susan Roaf, Luisa Brotas, Michael A. Humphreys
PublisherNCEUB 2018
Number of pages15
ISBN (Electronic)9780992895785
Publication statusPublished - 2018
Externally publishedYes
Event10th International Windsor Conference 2018: Rethinking Comfort - Windsor, United Kingdom
Duration: 2018 Apr 122018 Apr 15

Publication series

NameProceedings of 10th Windsor Conference: Rethinking Comfort


Conference10th International Windsor Conference 2018: Rethinking Comfort
Country/TerritoryUnited Kingdom


  • P-R chart
  • Provided temperature
  • Required temperature
  • Thermal acceptability
  • Thermal comfort

ASJC Scopus subject areas

  • Computer Science (miscellaneous)


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