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ZNC Counterflow Evaporative Condenser – Ductable & Quiet for Indoor Use
Efficient refrigerant condensation for industrial refrigeration systems
HACST evaporative condensers combine coil heat transfer, recirculating water and forced airflow to reject heat efficiently. The final configuration is selected around refrigerant duty, climate, water management and site integration requirements.
Specified around operating conditions and site requirements
Refrigerant type, condensing temperature, ambient conditions, water quality, noise limits and service access are considered before the unit arrangement is confirmed.
- Application-led selection: the configuration begins with the actual operating duty and project objective.
- Practical integration: installation footprint, access, controls and service requirements are considered early.
- Long-term operation: material, water, airflow and maintenance considerations are reviewed for the operating environment.
Configuration and performance considerations
Product Overview
ZNC delivers the thermodynamic advantages of counterflow evaporative condensation while using centrifugal fans that can handle external static pressure from intake or discharge ductwork. This enables compliant indoor installations where rooftop or open-air discharge is impractical or where stringent noise ordinances apply.
Working Principle
Refrigerant condenses inside the coil; spray water and induced airflow remove heat via evaporation. Unlike axial units, centrifugal fans draw air into the tower and discharge it against static resistance, maintaining design airflow through ducts, silencers, or louver banks, without compromising coil wetting or condensing pressure control.
When to Choose Centrifugal
- Indoor mechanical rooms with limited roof access.
- Projects requiring ducted intake/discharge with filters or attenuators.
- Ultra-low exterior noise requirements in dense urban zones.
- Retrofits where existing duct shafts must be reused.
Applications
- Hospitals, laboratories, data centers with stringent acoustic/air routing constraints.
- Food and pharma plants where intake air must be conditioned or filtered.
- Basement plant rooms in high-rise complexes.
Sizing & Ducting
In addition to heat rejection, selection must include external static pressure from duct runs, elbows, plenums, and silencers. Fan curves with VFD allow turndown and compensation for filter fouling. Provide access for coil and nozzle maintenance despite ducting. Consider larger casing for lower fan tip speed and noise.
Energy & Water Considerations
Centrifugal systems may draw more fan power than axial units; however, operating at a lower condensing temperature still achieves net system energy savings versus air-cooled solutions. Optimize with VFD control, smooth duct geometry, and low-pressure-drop silencers. Water management mirrors ZNX/ZHX with cycles control and filtration.
Materials & Options
Choose stainless steel coils for aggressive water or high sanitation requirements. Consider epoxy-coated casings for chemical exposure. Options include double-wall duct connections, quick-release access doors, basin heaters, and SS fasteners for hygienic wash-down.
Controls & Acoustic Design
- Static-pressure-based fan control with VFD to maintain design airflow.
- Condensing pressure reset with integrated pump staging.
- Acoustic design: splitter silencers, lined ducts, low blade passing frequency.
Installation & Maintenance
Verify structural support for dynamic fan loads. Seal duct connections to prevent bypass. Commission by balancing airflow and verifying spray coverage at rated static. Maintenance includes belt tension (if belt-driven), bearing lubrication, and periodic silencer cleaning to avoid pressure rise.
Development Trends
High-efficiency centrifugal wheels, direct-drive EC motors, and smart static-pressure control are pushing ZNC toward quieter, more compact indoor-ready packages. Predictive maintenance via vibration and pressure sensors reduces unplanned downtime.
Where this solution adds value
Each project is assessed around its operating conditions, environmental requirements and service expectations.
Four inputs for a more accurate equipment selection
- Confirm condensing dutyProvide refrigerant, heat load and required condensing conditions.
- Review water conditionsIdentify supply quality, treatment approach and drainage requirements.
- Check layout and airflowShare footprint, ventilation, noise and maintenance-clearance constraints.
- Coordinate controlsConfirm fan, pump and automation requirements.
Need help with your equipment selection?
Send your operating data and project requirements. HACST will help define a practical cooling solution.