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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Many data centers are located in the interiors of lower levels and basements in buildings, so an air-side economizer might not be the most cost-effective solution because the data center is hard to reach.
Two basic approaches that accomplish this are air-side economizer cycles and water-side free cooling.
In most climates however, the switchover from chiller operation to air-side economizer mode for data centers should be based on enthalpy controls, not on dry-bulb temperature alone.
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.
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.
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.
One example would be to identify when an air-side economizer might not be working in the right weather conditions.
ASHRAE Guideline 16-2003, Selecting Outdoor, Return, and Relief Dampers for Air-Side Economizer Systems.
Therefore, the recommended approach of using an outdoor air humidity ratio obtained through the internet can significantly improve air-side economizer operations.
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.
5[degrees]C) as shown in Table 2, which also shows a quick comparison of number of hours when free cooling is available with conventional air-side economizer as well as with the installed cooling system.