Air-Cooled and Water-Cooled Chillers Compared

An air-cooled chiller rejects heat to ambient air; a water-cooled chiller rejects it to condenser water. The latter generally requires a cooling tower or another heat-rejection system.

Technical assessment

Compare fan, pump, tower, water, treatment and maintenance costs alongside capital cost. Neither arrangement is universally more efficient or more economical for every site.

Information needed for selection

Provide the application, operating hours, cooling load, entering and leaving liquid temperatures, fluid type and concentration, flow, site location and environmental conditions. A nominal capacity alone does not replace a detailed equipment selection.

Frequently asked question

Does this guide replace a product performance sheet?

No. It explains selection inputs and technical limits. Confirm the final model, capacity and options through a manufacturer selection at the actual operating conditions.

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Technical sources

ASHRAE — Liquid-Chilling Systems

Air-cooled and water-cooled chiller comparison

Air-cooled and water-cooled chiller comparison
Criterion	Air-cooled	Water-cooled
Heat rejection	To outdoor air through condenser and fans	To condenser water; separate heat rejection equipment required
Infrastructure	Air circulation and suitable positioning	Water circuit, pump and suitable tower/heat rejection system
Selection condition	Outdoor temperature and air recirculation	Entering condenser water temperature, flow and water quality
Operating cost	Compressor/fan energy and maintenance	Chiller/pump/tower energy, water, treatment and maintenance
Comparison basis	Same water temperatures, load profile and system boundary	Same water temperatures, load profile and system boundary