Air-side economizer

Air-side economizer

An air economizer cycle reduces the load on the chilled water system by increasing the flow of outside air above the minimum required for ventilation when the outside air temperature is favorable in comparison to return air temperature; also known as free cooling. For example, if there is cool, dry air outside, it will be drawn into the building to cool it, instead of using chillers to provide cooling.
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Therefore, the recommended approach of using an outdoor air humidity ratio obtained through the internet can significantly improve air-side economizer operations.
In addition to displaying live building performance data, educational demonstrations show how the sustainable features in place at the data center actually work, like how free cooling is used to rely on low outside air temperatures to help chill the building's water, and how an air-side economizer reduces the facility's energy consumption costs.
Today, the data center is operated by approximately 100 employees and houses approximately 1,700 servers, manages approximately one petabyte in data storage and is cooled by the first air-side economizer in the Southwest.
Note that for fan systems, during occupied hours, Q is the coil load, including the sensible and latent load of conditioning the ventilation air with credit for any air-side economizer capacity at prevailing return-air and outdoor-air conditions.
Among the features contributing to this level of performance are: high-efficiency lighting, automated lighting controls, air-side economizer cooling controls and high-efficiency equipment.
Four different cooling technologies, including direct expansion (DX), the air-side economizer, the direct evaporative cooler, and the multistage indirect evaporative cooler, are examined for climate appropriateness and cooling energy reduction in data centers.
The VAV system uses an air-side economizer so its chiller performance map does not extend to air-side economizer conditions.
The proposed method was evaluated using data obtained for an air-side economizer and mixing chamber integrated with a typical small commercial rooftop air conditioner.
7[degrees]F by employing a ducted hot-aisle return, increasing capacity and efficiency of the CRAH unit, and increasing potential air-side economizer hours.
Using an air-side economizer, the system pulls cool, filtered air into the data center to cool customer's servers more than 80% of the year.
Allow additional hours of free cooling for a water-side or air-side economizer.
The hot air discharged from the equipment is either exhausted via exhaust fans located high on the east wall of the HPC, returned to the AHUs through ductwork down the west wall of the HPC, or most commonly, a combination of the two (see Air-Side Economizer and Evaporative Cooling section below).