A time-dependent model evaluating draft in indoor environment

The effect of exposure time on the percentage of people dissatisfied with draft was studied by exposing subjects to the airflow for 1 h. The results showed that the percentage of subjects dissatisfied with draft increased dramatically in the first 20 min of the exposure, then changed slowly in the last 40 min of the exposure. Based on the experimental results, a model was established to correlate the percentage of dissatisfied due to draft with exposure time as well as airflow velocity, temperature and turbulence intensity. The model is useful to design the air conditioning systems and the layouts of the interior spaces of buildings.

► The percentage of subjects dissatisfied with draft increases with exposure time.
► A model was established to predict the percentage of dissatisfied caused by draft.
► The model was built by considering exposure time as well as airflow parameters.
► This model can be a guide to design air conditioning systems.
► This model can be used to guide the layout of the interior spaces.