Cleanroom HVAC and Air Handling Equipment

Air-Cooled Chiller

An outdoor liquid chiller that rejects heat directly to ambient air and supplies chilled water to cleanroom coils without a cooling tower.

No Cooling Tower Required
Outdoor Heat Rejection
Staged or Variable Capacity
Optional Integrated Hydronics

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Product Introduction

The air-cooled chiller circulates refrigerant between one or more compressors, a liquid evaporator and outdoor finned condenser coils. Axial fans move ambient air through the condenser, eliminating the cooling tower, condenser-water pump and water-treatment loop associated with a water-cooled plant. Scroll compressors suit smaller and modular duties, while screw compressors serve larger capacities. Multiple refrigerant circuits, fan staging and optional variable-speed control improve part-load response and allow the chiller to follow changing cleanroom demand.

Key Features

Ambient-air heat rejection removes the need for a separate cooling-tower water system.

Independent refrigerant circuits provide staged capacity and reduce the impact of a single circuit shutdown.

Variable condenser fans control head pressure and reduce fan power during mild weather.

Factory hydronic options can combine pumps, expansion vessel and buffer volume on one outdoor base.

Customer Product Concerns

Air-cooled chillers are simple to site, but their capacity, noise and condensing pressure change with outdoor temperature and airflow conditions.

Hot recirculated discharge air reduces chiller capacity on a crowded roof.Adequate coil clearance and discharge orientation prevent short-circuiting of condenser air.

A large fixed compressor cycles repeatedly during low cleanroom load.Multiple circuits or variable-speed compression provide smaller capacity steps.

Low chilled-water volume causes rapid temperature swings and compressor cycling.A correctly sized buffer tank or minimum system volume stabilizes the hydronic loop.

Condenser noise reaches nearby occupied areas.Low-speed fan selection, compressor attenuation and night sound modes address acoustic limits.

Typical Applications

Cleanroom chilled-water plantsPharmaceutical process coolingLaboratory HVAC systemsMedical-device productionIndustrial temperature-control loops

Technical Parameters

Representative construction and cold-surface insulation data for an outdoor air-cooled chiller are listed below.

Core Material	Closed-cell NBR/PVC elastomeric foam on the evaporator and refrigerant suction piping
Panel Thickness	1.0–2.0 mm removable equipment enclosure panels
Effective Width	1000–2500 mm nominal unit width
Maximum Length	Up to 12000 mm for multi-circuit V-bank condenser arrangement
Steel Facing Thickness	1.0–2.0 mm galvanized structural and service panels
Core Density	48–96 kg/m³ NBR/PVC elastomeric insulation
Thermal Conductivity	0.0353 W/(m·K) at 24°C for the NBR/PVC elastomeric insulation
Surface Finish	Outdoor polyester powder-coated galvanized steel with aluminum finned condenser coils
Joint Type	Welded structural base with bolted coil frames and removable gasketed service panels
Customization	Available based on the intended application and operating environment.

Available Options

Scroll or screw compressor platformMicrochannel or aluminum-copper condenser coilIntegrated single or twin hydronic pumpsLow-ambient, low-noise and free-cooling packages

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