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https://svach.lbl.gov/what-is-an-economizer/
The economizer cools the building using far less energy compared to air conditioning. Economizers typically operate at night when the outdoor air is cooler than the indoor air in a process known as “free cooling”. Economizers mix enough outdoor air into the indoor air in order to meet the thermostat setpoint without using the compressor.
https://www.energystar.gov/products/low_carbon_it_campaign/12_ways_save_energy_data_center/air_side_economizer
Because data centers must be cooled 24/7, 365 days per year, air-side economizers may even make sense in hot climates, where they can take advantage of cooler evening or winter air temperatures. For various regions of the United States, Figure 14 shows the number of hours per year with ideal conditions for an air-side economizer.
https://www.vertiv.com/en-us/support/tools-applications/free-cooling-economizer-calculator/
Placing your cursor on the graph reveals the outdoor ambient temperature and the number of hours at that temperature during the year (a full year is 8,760 hours). Advanced controls used in the Liebert DSE continually modulate economization based on outdoor ambient temperatures, resulting in maximum free-cooling hours. Full Compressor: During warm temperatures, the …
https://buildingretuning.pnnl.gov/training/economizers/PNWD-SA-8511%20HVAC%20Economizers%20101-Section%201.pdf
• Identify economizer sensors, controllers, and controlled devices on a miniature or packaged HVAC unit. • Experiment with a working economizer unit under normal operations and abnormal or failed conditions to help students to determine a solution to the economizer problem for optimum efficiency of the equipment.
https://neec.net/wp-content/uploads/2009/04/NEEC-Economizer-11-2011.pdf
the annual hours of mechanical cooling system operation. There is a choice of economizer methods – air economizer or water economizer. Proper application of these systems can significantly reduce mechanical cooling energy used by air conditioning systems.. Fundamentals of air economizer
https://www.energystar.gov/products/low_carbon_it_campaign/12_ways_save_energy_data_center/water_side_economizer
Water-side economizers are best suited in climates where the wet bulb temperature is lower than 55°F for 3,000 hours or more. This describes the majority of the United States barring areas in the extreme Southwest and portions of the Southeast.
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