ABSTRACT
The reasons for ventilation lead into an understanding of the necessary combinations of natural and mechanical systems and air conditioning, which means full mechanical control of air movement through the building (Kut, 1993). The calculation of air changes and air flow rates from basic human requirements, and then for removal of heat gains, is fundamental. The sizing of air ducts and the calculation of heater and cooler loads utilizing the psychrometric chart of humid air properties is shown.
