Evaporative cooling and adiabatic humidification for data centers

By Anonymous -

The data center air-conditioning solution with the highest energy efficiency and lowest environmental impact


The graph illustrates the climatic conditions in which the evaporative cooling, in case combined with a heat recovery unit, gives the opportunity to reach the temperature and humidity conditions as recommended bt ASHRAE and reduces significantly the mechanical cooling energy consumption.

The green area (FC) represents the conditions in which it is possible to use the free cooling, the adjacent area (FC+MIX) describes the conditions in which it is necessary to mix the external air with the return air in order to keep the temperature under control. The area below (FC+MIX+HUMIDIFICATION) needs an additional adiabatic humidification to reach the minimum humidity set by ASHRAE.
The blue area (DEC) identifies the initial external air conditions, suitable to reach the temperature set point with direct evaporative cooling DEC only!
The yellow area (IEC) represents indirect evaporative cooling IEC using a heat exchanger between the external air and the recirculated internal air; the area (IEC+MECHANICAL+COOLING) needs a further mechanical cooling contribution. When the introduction of external air in the data center is not allowed, the IEC contribution will cover the previous DEC scenario.
The outside air condition where mechanical cooling only is required is represented by the red area.
Evaporative cooler, such as water spray atomizers, provide high efficiency cooling solutions with the added benefit of humidity control whilst ensuring substantial reduction in energy consumption and costs without any impact on maintenance costs.
Optimum control of the air-conditioning systems is equally crucial in maximising the energy saving available through evaporative cooling and eliminating inefficiencies.

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