ASHRAE Terminology

A Comprehensive Glossary of Terms for the Built Environment
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packaged indirect evaporative cooler

an indirect evaporative cooler with integrated or nonintegrated primary and secondary air passages and provided with both primary and secondary air moving devices. This device also includes the entire water distribution, collection, and recirculation system with pump and piping. This type may have provisions for installation of other heat and mass transfer devices, such as a direct evaporative cooler and auxiliary heating and cooling coils.

recirculating system

a domestic or service hot-water distribution system that includes a closed-circulation circuit designed to maintain usage temperatures in hot-water pipes near terminal devices (e.g., lavatory faucets, shower heads) in order to reduce the time required to obtain hot water when the terminal device valve is opened. The motive force for circulation is either natural (due to water density variations with temperature) or mechanical (recirculation pump).

recirculation of discharge air

(1) a condition pertaining to air-cooled condensers in which a portion of the discharge air enters along with the fresh air, the amount of recirculation is determined by equipment design, placement in regard to adjoining objects, and atmospheric conditions. The effect is generally evaluated on the basis of the decrease in unit capacity. (2) condition pertaining to cooling towers and evaporative condensers in which a portion of the discharge air enters along with the fresh air, the amount of recirculation is determined by equipment design, placement in regard to adjoining objects, and atmospheric conditions. The effect is generally evaluated on the basis of the increase in entering wet-bulb temperature compared to the ambient.

semipackaged primary indirect evaporative cooler (semipackaged primary IEC)

a component an indirect evaporative cooler provided with a primary air-moving device, that delivers primary air. This device also includes the entire water distribution, collection, and recirculation system with pump and piping.

semipackaged secondary indirect evaporative cooler (semipackaged secondary IEC)

a component an indirect evaporative cooler with integrated or nonintegrated primary and secondary air passages and provided with a secondary air moving device, which delivers secondary air. This device also includes the entire water distribution, collection, and recirculation system with pump and piping.