A pre-cool coil removes heat from outdoor air before it enters primary air handling equipment, improving efficiency and reducing peak cooling loads during high ambient temperature periods. These coils utilize cooler water sources to condition air upstream of main cooling units.
System Design
Pre-cool coils typically receive water from cooling towers, fluid coolers, or chilled water systems at temperatures 15-25°F above setpoint. They reduce entering air temperature to primary equipment, decreasing sensible cooling load and compressor runtime. Design specifications account for outdoor air percentage, desired temperature reduction, and available water supply temperature. Typical applications reduce peak load by 10-20% during design weather conditions.
Practical Applications
Pre-cool coils benefit data centers, hospitals, manufacturing facilities, and any systems with high outdoor air percentages. They extend equipment lifespan by reducing peak compressor stress and enable smaller primary cooling units. Installation requires dedicated water supply lines, drain provisions, and freeze protection in cold climates. Costs average $4,000-9,000 depending on system size and integration complexity. Expected service life reaches 12-16 years with routine coil cleaning and water treatment maintenance.