The driver vigilance and the concentration are vital for driving safety. The ambient conditions inside an automobile directly affect both the driver and also the passengers. Thermal comfort studies for automobile compartments have been always a concern for the HVAC designers, and the assessment of temperature and humidity is no more a luxury, on the other hand a necessary for modern cars.
In this study, affects of air velocity and time on ambient conditions inside an automobile during the heating period were found. Relationships between time, temperature and relative humidity were calculated.
From this study, the following conclusions were drawn:
(1) The effect of air velocity on temperature is similar to relative humidity for heating period.
(2) The effect of time on temperature is similar to relative humidity for heating period