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ZNC Counterflow Evaporative Condenser – Ductable & Quiet for Indoor Use
The HACST ZNC is similar to ZNX in using a counterflow condenser but is paired with centrifugal fan(s) capable of overcoming up to ~125 Pa external static pressure. Perfect for indoor machine rooms, hospital rooftops, or any application with ducted discharge or strict noise limits.
Working Principle
Spray water flows downward over the coil while air is drawn up by centrifugal fans. Heated, humid air is ducted or discharged via silencers. Drift is minimized, and water is reused in the basin.
Key Benefits
- Handles duct and silencer resistance—great for ASHRAE quiet-zone requirements.
- Lower acoustic signature vs axial under similar static loads.
- Clean loop retention like ZNX, suitable for contamination-sensitive environments.
Typical Technical Range
| Parameter | Typical Range |
|---|---|
| Capacity | 120–1,500 RT |
| Fan ESP | Up to 125 Pa |
| Fan Type | Centrifugal, belt or direct drive |
Engineering Options
- Duct adapters, silencers, access for fan maintenance
- Seismic/roof-mounted bases, corrosion-resistant fan housing
- Controls with VFD and noise monitoring
Selection Guide
- Select ZNC where axial fans cannot overcome duct losses.
- Ensure ESP calculation includes louver, silencer, and duct entries.
O&M
- Monthly: belt tension and fan bearings check.
- Quarterly: fan wheel balance and vibration baseline.
FAQ
Q: Can ZNC be used outdoors?
A: Yes—with weatherproof fan enclosures and proper intake weather hoods.
Request a Quote
Share your static pressure, cooling load, wet-bulb, and noise targets. We’ll engineer an effective ZNC solution.