Emerson Network Power > United States > Products > By Type > Thermal Management > Air Handlers > Liebert Custom Air Handling Units Free-Cooling Direct and Indirect Evaporative Systems Liebert Custom Air Handling Units, Data Sheet, (R03/15) (SL-19700) Liebert Indirect Evaporative Freecooling Unit, Data Sheet , (R06/15) (SL-19711) Liebert Chilled Water Air Handler, Data Sheet , (R06/15) (SL-19712) Liebert Direct Expansion Air Handlers, Data Sheet, (R06/15) (SL-19713) Liebert Direct Evaporative Freecooling Unit, Data Sheet, (R06/15) (SL-19714) View Customer Success Green House Data Video View Maximize Efficiency and Whitespace Video View Competitive Advantage of Cooling Efficiency Video Liebert Custom Air Handling Solutions offering maximum flexibility with industry best efficiency, availability and service support leveraging 40+ years of data center experience. Liebert Indirect Evaporative Freecooling Unit PUE < 1.2 with minimal water usage

Highly efficient aluminum air-to-air heat exchanger offers up to 66% efficiency dry and 78% efficiency wet Supplemental DX or chilled water options available for trim cooling requirements Liebert Direct Evaporative Freecooling Unit PUE < 1.1 with minimal water usage DX or chilled water secondary cooling options sized for full or trim cooling EC or direct drive fans with VFD options arranged in single or fan array configurations Liebert Chilled Water Air Handler Optional air economization for optimum efficiency Liebert DX Air Handler High quality, highly efficient rooftop DX solutions specifically designed for data centers Configurations incorporate outside air economization, variable capacity compressors, bypass dampers, and evaporative condensers High-strength thermal-break construction with 2” foam-injected walls, doors and flooring providing an R-value of R12 for greater efficiency and durability Standard Casing Ratings DLC of 5.0

Panel deflection of L/250 Frame and removable panel design allowing for service or replacement of large internal components Welded or bolted-base construction for high durability and strength Standing-seam roof construction eliminating water infiltration Optional 4” enhanced casing offering greater energy efficiency with an R-value of R24 and additional acoustical and corrosive environment protection alternatives Leakage rate of less than 1% at 10” Panel deflection of L/400 at 10” With Proper Maintenance, Unit Construction Engineered to Last Over 30+ YearsEC and Direct Drive Fans with VFD arranged in individual or fan arrays Variable & Digital Compressors High Efficiency Aluminum Air-to-Air Heat Exchanger – up to 66% efficiency dry and 78% efficiency wet Multi Stage Direct Evaporative Media Optional Evaporative CondenserLiebert® Custom Air Handling UnitsSpecifications table 25,000 – 80,000+ CFM Indoor Unit – Downflow, Upflow, & Horizontal Airflow

20,000 – 80,000+ CFM Data center, gallery, rooftop or external building perimeter 150 – 400+ kW 20,000 – 60,000+ CFM Rooftop or external building perimeter Rooftop or building perimeter Customer Success Green House DataAbout Air Handling Units Data centre air handling units (AHUs) come in a number of different configurations. The most common types are as follows: Down-flow – this is the most common type of air handler experienced in enterprise data centres. window ac unit consumption per hourThe term down flow refers to the way the air moves through the unit. whole house ac unit pricesIn this configurations exhaust air from the servers enters the top of the AHU, is pulled across a cooling coil and blown, by internal fans, into the data centre’s under-floor plenum. wall air conditioning unit installation

These units generally have EU4 filtration or similar internally and can be combined with direct fresh air systems. Down flow units are deployed using either chilled water or direct expansion cooling systems, or a combination of the two together in some free-cooling applications. Up-flow – generally only encountered in legacy data centres up flow air handling units work the opposite way to down flow units. Due to advances in aisle containment technology and data centre design up flow units are very rarely deployed in new data centres. Both Down-flow and Up-flow AHU’s are often still referred to as CRAC Units or simply CRAC’s, from their historic name i.e. Computer Room Air Conditioning Units In-Row – originally brought to market by APC most AHU manufacturers now have an in-row product offering. Whereas up and down flow systems move the air vertically in-row units move air horizontally, pulling it directly from the hot aisle, cooling it, then delivering it directly to the cold aisle.

Within certain sets of physical constraints in-row units do have advantages over vertical air flow systems. In-rows are very efficient in their use of fan energy as there is no external resistance to the air flow and they offer high cooling duties relative to their footprint. Rear door heat exchangers – both active and passive rear door systems, like in-row systems, move the air horizontally. Rear door systems place the cooling coils at the rear of the server cabinet and can support very high densities. They are extremely space efficient and offer even greater cooling duty per m2 of floor space than In-row cooling. With good design and the right configuration of heat rejection plant they can provide exceptional energy efficiency. These are some of the more common air handling systems used in today’s data centres. There are others and it is important to note is that each configuration will have different pro’s and con’s depending upon the particular requirements and constraints of each application.