| The American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE) Standard 62 (Ventilation for Acceptable Indoor Air Quality) requires that a certain flow rate of ventilation air must reach the occupants of a building. A new draft standard, ASHRAE 129P (Ventilation Effectiveness), provides a method-of-test for determining compliance with Standard 62. Unfortunately, due to the properties of air distribution systems, a system designed using Standard 62 will not necessarily fulfill the requirements of the new ventilation effectiveness standard. In this research, a simplified design and analysis method has been developed for finding the air delivery to the occupants of a building. This method employs the Laplace transform/block diagram and age-of-air techniques for the evaluation of indoor air quality (IAQ). A comparison of the simplified method is made to experimental and numerical (computational fluid dynamics, CFD) data and the limitations are presented. |
