Impact of wind spectra on human thermal comfort

The comparison of the power spectra of natural wind and the power spectra of artificial air movement shows that the natural wind spectra has many lower frequency variations than those of artificial airflow. Therefore a new method was developed for generating air movements with the same velocity spectra as those of the natural wind. Air flows generated with the new method were used to assess the impact of the spectra shape and the upper and lower frequency limits on the human thermal comfort. The subjective experiments indicate that the upper frequency limit for thermal comfort is about 1 Hz and the lower frequency limit is about 0.244-0.488 mHz and that the air movement with the spectra similar to those of the natural wind is more suitable for the human thermal comfort than other air movement modes.