FIGURE – Values on the diagram are taken according to IDEC-072

 

Stage 1 – Indirect Evaporative Cooling

In first indirect stage air is cooled without adding moisture. In this sensible cooling stage, inlet air is precooled with Indirect Evaporative Cooling technology. First-stage cooling follows a line of constant moisture content as no moisture is added to the primary airstream. This method improves energy efficiency by lowering the dry-bulb and wet-bulb temperatures without use of compressors.

 

Stage 2 – Direct Evaporative Cooling

The same air stream passes through a wet (evaporative pad) where additional cooling takes place and the air is saturated with moisture which is required to condition the space. The second stage follows the wet bulb temperature line at the condition of the air leaving the first stage. Supply air is delivered at near saturated state which has lower humidity than using only a direct evaporative cooler.

System Advantages

No compressor and refrigerant

Natural cooling by evaporation of water

Better performance at higher ambiant temperatures

Consumes less electricity than A/C Systems

Upto 5 °C better cooling and lower supply temperature than direct evaporative cooling

100% Fresh Air