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Updated: Jun 23, 2026

Design and Optimization Strategies of a High-Performance Vented Box

Design and Optimization Strategies of a High-Performance Vented Box

Published on: June 9, 2023

A simplified approach to describe complex diffusers in displacement ventilation for CFD simulations.

Tengfei Tim Zhang¹, Kisup Lee, Qingyan Yan Chen

¹School of Civil and Hydraulic Engineering, Dalian University of Technology (DUT), Dalian, China. tzhang.dut@gmail.com

|April 23, 2009

Summary

A new simplified method enhances computational fluid dynamics (CFD) simulations for displacement ventilation systems. This approach accurately models complex air diffusers, improving indoor air quality and energy efficiency predictions.

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A Modeling and Simulation Method for Preliminary Design of an Electro-Variable Displacement Pump

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Area of Science:

Building Science
Mechanical Engineering
Environmental Engineering

Background:

Displacement ventilation is increasingly popular for improving indoor air quality and reducing energy demand.
Numerical simulation of displacement ventilation using CFD is challenging due to complex diffuser geometries and airflow patterns.
Existing methods often oversimplify diffusers, leading to inaccuracies in simulations.

Purpose of the Study:

To develop a simplified and computationally efficient method for simulating air distribution with complex diffusers in displacement ventilation systems.
To improve the accuracy of CFD simulations for displacement ventilation by accurately representing diffuser characteristics.
To validate the proposed method against experimental data.

Main Methods:

Developed a novel method to describe complex diffusers by specifying jet momentum and adjusting effective areas.
Implemented the method in a commercial CFD program.
Simulated air distributions (velocity, temperature, contaminant concentration) in an office and workshop under cooling and heating conditions.

Main Results:

The simplified method accurately models various diffuser types (quarter-circular-perforated, grille, floor-perforated, swirl).
Simulations showed good agreement with experimental data for air velocity, temperature, and airborne contaminant concentration.
The method offers high computational efficiency compared to traditional approaches.

Conclusions:

The presented simplified method effectively describes complex diffusers in CFD simulations of displacement ventilation.
This approach enhances computational efficiency for displacement ventilation design and analysis.
The method is applicable to various ventilation systems with complex diffusers.