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Cooling Coil
Drift Eliminator
PVC Fill
Fan
Spray Nozzle
V-Type Adiabatic Dry Cooler
ZHX Combined Flow Evaporative Condenser – Enhanced Efficiency with Fill-Assisted Heat Transfer
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
ZHX merges crossflow and counterflow air paths. Spray water simultaneously wets the coil and passes through a dedicated fill pack. Horizontal air intake improves wetting uniformity, while vertical counterflow across the coil boosts LMTD. The result is a lower approach temperature at a given fan power, ideal for large refrigeration plants pursuing best-in-class compressor efficiency.
Working Principle
In the 2HX series, refrigerant condenses inside the closed coil while recirculated water is sprayed over the coil to enhance heat transfer. At the same time, part of the spray water passes through PVC fill, which increases contact area, pre-cools the incoming air, and lowers water temperature. Fresh air enters from both the sides (crossflow) and bottom (counterflow), then mixes with spray water as it flows upward, carrying heat away with the axial fans.
This dual-path airflow ensures stable performance under fluctuating loads and varying ambient conditions. Collected water is returned to the basin through drift eliminators for recirculation, ensuring low water consumption and efficient, continuous operation.
Why Combined-Flow?
- Excellent Heat Exchange – Dual airflow paths and the combination of coil and PVC fill maximize contact efficiency, avoid dry spots and scaling, and deliver superior thermal performance.
- Stable & Efficient Operation – Crossflow segments improve water distribution, while VFD control enables high efficiency even at partial load.
- Compact & Practical Design – Higher cooling capacity per footprint than single-flow designs; modular upper and lower body structure simplifies transport and installation.
- Easy Maintenance – Spacious internal layout allows on-site inspection during operation, while suspended PVC fill and a sloped basin floor toward the drain make cleaning fast and convenient.
Applications
- Large cold storage campuses and food logistics hubs.
- Dairy, meat processing, beverage and brewery lines.
- Petrochemical and specialty chemical plants with variable loads.
Sizing & Selection
Define heat of rejection at design, wet-bulb, target condensing temperature, and permissible noise. ZHX is preferred when approach ≤5 K is desired without oversizing. Select coil material per water chemistry; specify low-speed axial fans with VFD for acoustic-sensitive zones. Where height is constrained, ZHX yields more capacity per footprint than pure crossflow.
Energy & Water Efficiency
The fill path pre-cools air, reducing fan power for a given condensing pressure. Water use is optimized via cycles-of-concentration control, side-stream filtration, and drift eliminators. Compared with air-cooled condensers, ZHX can deliver double-digit compressor kWh savings annually, particularly in warm, humid climates where wet-bulb leverage is significant.
Materials & Hygiene
Coil: HDG standard, stainless optional. Casing: galvanized or pre-painted steel; SS for coastal/chemical sites. Drift eliminators limit carryover; accessible basins and removable panels facilitate sanitation programs aligned with industrial hygiene best practices.
Controls & Options
- Integrated condensing pressure reset and floating head pressure strategies.
- Ambient/wet-bulb tracking for fan VFD and spray staging.
- Winter duty kits: basin heaters, smart drain, freeze protection.
- Acoustic packages: low-tip-speed blades, discharge silencers.
Installation & Maintenance
Provide clear side-air inlets and top discharge. Ensure structural plinth, vibration isolation, and accessible service sides. Commission with nozzle verification, eliminator inspection, and control loop tuning. Quarterly tasks: water quality checks, blowdown calibration, basin sediment removal, coil integrity checks.
Development Trends
ZHX is at the forefront of hybridization—pairing with adiabatic dry sections for shoulder seasons, and employing advanced polymer fills to resist fouling. Digital condition monitoring and cloud analytics are becoming standard to maximize uptime and minimize lifecycle cost.
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.