How does an air side economizer work?
An air-side economizer (see Figure 1 below) brings cool air from outdoors into a building and distributes it to the servers. Instead of being re-circulated and cooled, the exhaust air from the servers is simply directed outside.
What is airside economiser?
Airside economizers are a duct and damper arrangement with an automatic control system that together allow a cooling system to supply outdoor air to reduce or eliminate the need for mechanical cooling during mild or cold weather.
How does a free cooling chiller work?
Free Cooling, simply put, is using colder ambient air (colder than the supply chilled water set point) to perform cooling rather than the refrigeration cycle of the chiller. In our HVAC-systems world, the proper technical name is waterside economizer.
How does an economizer reduce HVAC operating cost?
The HVAC economizer draws in outdoor air, providing the air is below the set temperature and the humidity is lower than a set percentage. This reduces the time your AC is running, which reduces your HVAC energy consumption.
What does free cooling mean in HVAC?
The economizer functions at ambient outside temperatures that allow cooler air to be brought in from outside rather than run mechanical cooling to perform the air conditioning task of the unit, and because mechanical cooling equals money spent on power, cool air is still free.
What is non condensing economizer?
Non-condensing economizers They are heat exchanger coils‚ usually finned‚ that are located in the flue gas ducting at the exit of the boiler. Typically‚ a non-condensing economizer will raise the overall efficiency by 2 % to 4 % .
What is free cooling ventilation?
Free cooling is the process of using external ambient temperature to reject heat, rather than using the refrigeration process. If used within an optimised system, free cooling can provide significant energy savings.
What is a free cooling system?
A free cooling system reduces energy use by using a fluid cooler or cooling tower to cool the process fluid in place of a chiller. The free cooling source is commonly a fluid cooler but a cooling tower may be used.
Is condensing better than non-condensing?
The main reason why condensing boilers are better than non-condensing models is that they are at least 25% more efficient. Their level of efficiency is achieved by using waste heat in flue gas to preheat the cold water entering the boiler, capturing more heat from the outside rather than the inside of a room.
What is an air side economizer?
Air-Side Economizer. Description. An air-side economizer (see Figure 13 below) brings outside air into a building and distributes it to the servers. Instead of being re-circulated and cooled, the exhaust air from the servers is simply directed outside.
Do I need an air-side economizer for my data center?
Because data centers must be cooled 24/7, 365 days per year, air-side economizers may make sense in hot climates, where they can take advantage of cooler evening and winter air temperatures. Even in northern Florida, an air-side economizer can be utilized for about half the year.
What is the economizer mode on an air conditioner?
In this mode, the economizer system adjusts both the outdoor- and return-air dampers, modulating these airflows to match cooling capacity with cooling load—without mechanical cooling. Intake airflow varies between the minimum setting and a maximum value (100% of supply airflow) to maintain the supply-air (or space) temperature at setpoint.
Does humidity control cut into the savings of air side economizers?
Humidity control can cut into the savings achieved by an air-side economizer. In certain geographic locations, for example, air can be very cool but also very dry; consequently it may be necessary to expend a lot of energy humidifying the air.