Generator Room Ventilation

Generator Room Ventilation Applying Fans, ANSYS Fluent CFD Simulation Tutorial

Description

This project simulates ventilation within an industrial generator room using ANSYS Fluent. Generators are among the most widely used and essential electricity sources across various industries, but they generate substantial heat — enough that when several units operate together, thermal comfort suffers significantly, and operators may struggle to approach the generators safely in summer due to extreme heat buildup. To address this, fans are placed within the generator room to bring indoor temperatures down to a level suitable for operators.

The 3D geometry was designed in SpaceClaim, representing a rectangular space housing 32 diesel generators. The domain was meshed in ANSYS Meshing, totaling 3,854,957 elements.

Methodology

This project simulates the generator room's heating, ventilation, and air conditioning (HVAC) performance across three progressive configurations. The room was first simulated without any fans, establishing a baseline temperature reading. Thirty-two fans rated at 11,000 CFM were then introduced, considerably reducing the temperature. To further improve ventilation and achieve the desired thermal comfort between generator rows, an expanded configuration adding fans rated at 36,500 CFM was also evaluated.

Turbulence was resolved using the Realizable k-epsilon model, with the energy equation enabled to capture temperature variation throughout the generator room across each configuration.

Conclusion

The baseline simulation, run without any fans, showed temperatures between the generators exceeding 49°C — confirming the clear need for active cooling. Introducing 32 fans at 11,000 CFM each brought this temperature down considerably, to 36°C, demonstrating a meaningful but still incomplete improvement.

A further configuration using 64 fans total (32 at 11,000 CFM and 32 at 13,500 CFM) was then evaluated to push thermal comfort closer to the desired target. This final configuration showed markedly improved airflow velocity throughout the room compared to the previous setup, with the temperature between the generators dropping all the way to match the outside ambient temperature of 30°C — confirming that this expanded fan configuration successfully achieves the thermal comfort objective for generator room operators.