In mid-February 2026, the engineering team completed an advanced training course in fan aerodynamics and computational fluid dynamics (CFD), aimed at improving impeller design and raising fan efficiency.
Fan efficiency is rarely a single headline percentage; it is a curve across the operating range, and most fans spend their lives away from the peak. That is why simulation has become a normal part of centrifugal development: by visualising flow separation and leakage losses inside the volute before a physical prototype is cut, engineers can iterate on screen and spend the test-lab time only on the variants most likely to succeed. The payoff is measured not in a laboratory curiosity but in operating cost over thousands of running hours.
What the Training Covered
Modern fan development rarely stops at empirical testing. CFD lets engineers visualise the flow field inside a volute, see where flow separates from the blade, and quantify the losses that steal efficiency. The course moved from turbulence-model fundamentals to practical mesh strategy and post-processing of pressure and velocity fields on real impeller geometries taken from the factory's own product line.
For centrifugal fans, the high-value insight is usually at the blade inlet and the blade-to-shroud junction, where secondary flow and leakage losses concentrate. Training the team to read those regions means future impellers can be iterated in software before a physical prototype is cut, saving both time and material on each design cycle.
The programme also addressed turbulence modelling choices. Picking too coarse a model hides the very separations the team wants to see, while an over-refined model is slow; the training balanced accuracy against turnaround so the method fits a production environment rather than a research lab.
Parameters the Method Improves
CFD does not replace the test lab, but it focuses the lab work on the variants most likely to succeed. The aspects most affected are listed below.
| Design aspect | CFD contribution | Expected effect |
|---|---|---|
| Blade inlet angle | Reduce incidence loss | +1 to 3% efficiency |
| Volute width | Cut exit separation | Lower noise |
| Impeller gap | Quantify leakage | Better pressure |
| Outlet cone | Smooth recovery | +0.5 to 2% efficiency |
Marginal efficiency gains scale with operating hours. On a 30 kW centrifugal fan running 6,000 hours per year, even a 2% efficiency improvement is meaningful energy over the unit's life, and across a plant with dozens of fans the saving compounds into a real operating-cost difference.
Noise benefits matter as much as efficiency in many buildings. By smoothing the flow exit, CFD-led changes often reduce tonal components that annoy occupants, so the same redesign serves both the energy and the acoustic specification.
How to Read Efficiency Claims
Buyers should treat efficiency numbers with care, using this checklist rather than trusting a single headline figure:
- Ask for the test standard: Efficiency must be tied to a defined measurement method, not a marketing figure quoted without context.
- Check the duty point: Peak efficiency away from your operating point is worthless in practice; ask for the curve around your duty.
- Look for the curve: A full performance curve beats a single best-point number and shows where the fan actually spends its life.
- Consider part load: Variable-speed operation shifts the efficient zone; model it, because most fans rarely run at peak.
- Verify in-house: An on-site performance lab supports the claimed data and lets the supplier re-test if disputed.
- Weigh lifecycle: A 2% efficiency gain on a continuously running fan outweighs a small first-cost saving on a cheaper, less efficient unit.
Why Engineering Investment Matters
Keruite has spent 30+ years manufacturing HVAC equipment at its 80,000 m² Dezhou facility, and training the team in CFD is a direct investment in the next generation of impellers. Combined with an in-house performance testing laboratory, the approach shortens the path from simulation to a verified, efficient product.
For customers, the downstream effect is quieter, more efficient fans backed by measured data rather than estimates. the company treats the CFD capability as part of its standard engineering service, which means future product revisions can carry these gains into the catalogue without a separate request.
Buyers should read any efficiency claim against the duty point they actually run, not the best point on the brochure, and ask for the measurement standard behind the number so curves from different makers can be compared fairly. On a 30 kW centrifugal running 6,000 hours per year, even a 2% efficiency gain is meaningful energy across the unit's life, and across a plant with dozens of fans the saving compounds. With 30+ years of manufacturing at the 80,000 m² Dezhou facility and an in-house performance testing laboratory, the company can verify simulated gains against measured data rather than assertion.
Beyond the percentage on a data sheet, efficiency should be judged across the whole installed life, because a fan that runs continuously accrues its energy cost every hour it operates and a small efficiency gap becomes a large bill over a decade. Variable-speed operation shifts the efficient zone, so specifiers should model part-load rather than assume the unit lives at peak, and weigh a slightly higher first cost against steady savings on a continuously running duty. An on-site performance laboratory lets the supplier re-test a disputed unit, which is the practical backstop that turns an efficiency claim into a verified result rather than a marketing figure.
Engineers in Dezhou respond to selection enquiries within 24 hours, and the factory ships most standard fans from its 80,000 m² site within agreed lead times.