Features of natural and artificial air movement.

Features of natural wind and artificial airflow are related to human thermal sensation. Based on the existing records of natural wind and artificial air movement, their turbulent intensity of velocity fluctuation, energy spectra. probability distribution of velocity are compared and analyzed.

Effect of ventilation on indoor thermal comfort.

Adequate ventilation and good air quality are essential for the comfort of occupants and productivity. Excessive ventilation however, may result in discomfort and high energy loss. A study was carried out to examine the influence of ventilation on indoor thermal conditions. The results show that ventilation has profound effect on lowering the indoor temperature, particularly the night time ventilation. Derived PMV is compared with actual votes (thermal sensation) and found that PMV is lower than actual votes.