2-Stage
Industrial Evaporative Cooling

Dual Inlet Model Specifications

2-Stage Indirect/Direct Evaporative Cooling

2-Stage cooling allows you to use energy-saving evaporative cooling technology for design conditions where direct evaporative cooling alone is not adequate. A 2-stage cooler results in greater cooling power, less affected by higher ambient temperature and humidity. In the indirect cooling stage, outside entering air is cooled sensibly reducing its total enthalpy. This “pre-cooled” air is then evaporatively cooled in the direct cooling stage, approaching its new, lower wet-bulb temperature. The end result is discharge temperatures near or even slightly below the wet-bulb temperature. More importantly, these lower discharge temperatures translate into customer comfort at a fraction of the cost of refrigerated air conditioning. Indirect/Direct Evaporative Cooling Process In the indirect cooling stage, entering air is cooled along a horizontal humidity ratio line on the Psychrometric Chart (A to B) without adding moisture. In the next cooling stage, this air is further cooled along a new wetbulb line (B to C), resulting in a lower dry-bulb temperature of leaving air than can be achieved with single stage direct evaporative cooling alone.

Applications With its substantial increase in cooling capacity, the indirect/direct 2-stage Industrial MasterCool can replace mechanical refrigeration in many applications.

KoolKalk...Computer Aided Sizing The sizing method described in this brochure can be used for general sizing of direct evaporative Industrial MasterCool units For more accurate sizing, and for sizing indirect/direct units, we recommend the use of KoolKalk... an IBM compatible computer program designed specifically for AdobeAir Evaporative Coolers. Contact your local AdobeAir representative for more information.

The Indirect Cooling Module (ICM)

Outside air is drawn into the ICM. A fan draws air through the inside of vertical fins (which have water running inside them). The air picks up heat and is expelled from the ICM while the fins are cooled by evaporation. Other outside air is drawn across the outside surfaces of the cooled fins, and is cooled without coming in contact with water. This cooled air, with no humidity added, then enters the direct evaporative section of the Industrial MasterCool for final cooling.

Typical Configurations Many configurations of 2-Stage Industrial MasterCool are possible. Typical field assembled components include 2, 3, or 4 Indirect Cooling Modules with Models MD/MS524 and 4, 6, or 8 ICM’s with models MD/MS/MU628 Contact your local MasterCool representative for assistance in sizing. Models shown with three ICM’s at each inlet location.