Industrial facilities requiring continuous fresh air often face high electricity bills from conventional vapor-compression air handlers. The Two-Stage Evaporative Air Handling Unit (AHU) combines Indirect Evaporative Cooling (IDEC) with Direct Evaporative Cooling (DEC) to achieve up to 86% energy savings compared to standard air-cooled chillers.

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How Two-Stage Evaporative Cooling Works

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• Stage 1: Indirect Evaporative Cooling (IDEC): Hot ambient air passes through a specialized polypropylene plate heat exchanger featuring moisture-wicking natural fiber sheets. A secondary air stream cools the heat exchanger surfaces, sensible cooling the main air stream without adding any moisture.

• Stage 2: Direct Evaporative Cooling (DEC): The pre-cooled air moves through wetted Celdek cooling pads. Controlled water evaporation further reduces dry-bulb temperature down to target levels while maintaining safe humidity levels.

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Key System Components

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• EC Plus Axial Fans: Direct-drive permanent magnet motors eliminate belt friction losses, delivering precise airflow via VFD speed control.

• Dual Submersible Pumps: Duty/standby pump configuration provides redundancy for continuous wet-pad operation.

• UV-C Water Purification: Cleans recirculated water to prevent algae, bacterial growth, and media clogging.

• PLC Automated Control: Continuously adjusts fan speeds and pump operation based on real-time ambient and indoor psychrometric sensors.

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