3852 -- Toward a Simplified Design Method for Determining the Air Change Effectiveness PDF

Describes progress in developing practical air change effectiveness modelling techniques for the design and analysis of air diffusion in occupied rooms. The ultimate goal of this continuing work is to develop a simple and reliable method for determining HVAC system compliance with ventilation standards. In this current work, simplified, two-region models of rooms are used with six occupancy patterns to find the air change effectiveness. A new measure, the apparent air change rate (ACH) effectiveness, yields the relative ventilation performance of an air diffusion system. States this measure can be used for the prediction or evaluation of outside air delivery to the occupied part of a room. The required outside air can be greater or less than that specified by ventilation standards such as ANSI/ASHRAE Standard 62-1989 due to poor or effective air distribution.

KEYWORDS: year 1995, Calculating, designing, air change rate, performance, ventilation, standards, air diffusion, outdoor air