Excool Adiabatic Evaporative Free Air Cooling Modes of Operation
Hot return air from the data hall is drawn through the heat exchanger by energy efficient EC plug fans. Cool outdoor air is drawn through a second air path in the heat exchanger by a set of independently controlled fans.
In turn the data centre supply air temperature is dynamically controlled by a combination of the winter optimisation air flow dampers and outdoor air fan speed.
Moisture is added to the hot outdoor air which has the effect of lowering the dry bulb temperature through the adiabatic process. A typical UK peak summer day may have a dry bulb of 35°C with a wet bulb temperature of 21°C. By fully saturating the air the dry bulb temperature can be reduced to 21°C. This reduced temperature air is then used as a cooling medium. This enables AHRAE Class A1 – A4 temperatures to be maintained throughout the year.
Optional Top-up Module
In more challenging environments in may be necessary to ‘top-up’ the cooling capacity with a partial DX or Chilled water supplementary cooling section.
The integrated top-up modules are designed to complement the heat exchangers during extreme summer conditions. These top up systems are sized as a small percentage of the overall cooling capacity of the Excool module.