Holyoake

seamless integration In cooling mode, diffuser selection should be based on the ratio of the diffusers throw to the length of the zone/ area being supplied, at all design airflow rates, to achieve an acceptable Air Diffusion Performance Index (ADPI). In heating mode, the diffuser to room temperature difference (delta-t) should not exceed 15°C, to avoid excessive temperature stratification. ASHRAE has defined a term for describing the mixing of supply and room air as Air Change Effectiveness, or ACE. This term is used in both ASHRAE Standard 129, the Method of Test for Air Change Effectiveness, and in ASHRAE Ventilation Standard 62.1-2013. When a high ADPI is measured, the ACE is always high as well. Holyoake have simplified ADPI analysis by combining a diffuser’s throw performance with a l/s/m2 analysis and diffuser spacing to produce an ADPI Performance Envelope graph.