Airflow Sciences Corporation has performed modeling and testing services for the nuclear power industry and can help solve your complicated engineering problems. ASC can determine the best methodology for analyzing and improving the ventilation capacity.
A summary of the results of 3D velocity field testing and CFD flow modeling to determine the cause of HVAC exhaust fan failure and improve ventilation can be found in a presentation given at the 2015 NHUG Summer Meeting.
Isophase Bus Ducts
As nuclear power plants are increasing their output, the efficiency of the cooling system in the isophase bus ducts becomes more important. Maximum cooling capacity can be achieved by balancing air flow, whether in an
existing system, or as part of an upgrade to the bus, bus ducts, or fans. ASC accurately measures the flow in the duct branches, then balances flow through an iterative process of fan operation and damper position changes.
For one particularly challenging bus duct geometry that had the additional complexity of limited test port accessibility, a full scale mock-up of the generator-side ducts was fabricated in ASC's laboratory. The purpose of this physical model was:
- to understand the flow patterns
- to develop correlation curves for flow rate versus damper setting in various branches.
The results of this flow study allowed accurate, repeatable flow measurements in the generator-side ducts, giving the ability to balance flow between the branches.