Written by Ruturaj Patil
Wednesday, March 29, 2023
Air Diffusion Performance Index (ADPI) feature in Autonomous HVAC CFD
By
Ruturaj Patil
Air Diffusion Performance Index (ADPI) has been introduced in Autonomous HVAC CFD and it is a game-changer in the field of HVAC design. The ADPI is a single-number rating of the air diffusion performance of a system of diffusers in a defined space and it is crucial in ensuring occupant thermal comfort. As per ASHRAE Standard 113, the ADPI is calculated based on the supply air delivery rate and the space load.
Traditionally, the T50/L ratio provided by equipment manufacturers may not be sufficient to gauge the system performance accurately, especially when dealing with complex building geometries and diffuser geometries like swirl diffusers. This is because the ADPI is a system-level rating, not a component-level rating. Autonomous HVAC CFD solves this problem by leveraging the power of Computational Fluid Dynamics to calculate the ADPI rating at a system level.
Autonomous HVAC CFD offers two approaches for calculating the ADPI rating -
- 1. Standard Test Position Approach : ADPI rating is calculated as per ASHRAE Standard 113
- 2. Volume Weighted Approach: ADPI rating is calculated based on the effective draft temperature and air speed values in every cell in the occupied zone, rather than just a few test positions.
Standard Test Position Approach
Volume Weighted Approach
The introduction of the ADPI feature in Autonomous HVAC CFD is a major breakthrough that will improve the ability to predict occupant thermal comfort and optimize the performance of HVAC systems. We believe that this tool will be widely used to enhance the air quality and thermal comfort of buildings.
ADPI
In conclusion, the addition of the ADPI feature in Autonomous HVAC CFD is a significant step forward in the field of HVAC design, and we can't wait to see its impact on the industry.
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