Time-Temperature Preferences (08-18-21)

Vellei  and colleagues studied how preferred air temperatures vary from one time of day to another.  They report that their efforts reveal “some evidence of a time-varying thermal perception by using: (1) data from about 10,000 connected Canadian thermostats made available as part of the ‘Donate Your Data' dataset and (2) about 22,000 samples of complete (objective + ‘right-here-right-now' subjective) thermal comfort field data from the ASHRAE I and SCATs datasets. We observe that occupants prefer colder thermal conditions at 14:00 and progressively warmer ones in the rest of the day, indistinctively in the morning and evening. Neutral temperature differences between 08:00 and 14:00 and 14:00 and 20:00 are estimated to be of the order of 2°C.”

Marika Vellei, William O’Brien, Simon Martinez, and Jerome Le Dreau.  “Some Evidence of a Time-Varying Thermal Perception.”  Indoor and Built Environment, in press, https://doi.org/10.1177/1420326X211034563