STULZ Water-Side Economizer

Traditional Economizer Cooling

Traditional Economizer Cooling is comprised of a constant fan speed dry cooler (with fans being cycled on and off based on fluid temperature), constant speed pumps, and water/glycol cooled free cooling CRACs (consisting of both a DX cooling coil and a water/glycol free cooling coil).

Evaporative Tower Economizer Cooling

Evaporative Tower Economizer Cooling is comprised of a closed loop evaporative cooling tower (fan speed controlled based on fluid temperature), a constant speed pump, and water/glycol cooled free cooling CRACs (consisting of both a DX and a water/glycol free cooling coil).

STULZ Dynamic Economizer Cooling (DEC)

Leading-Edge Design

The STULZ Dynamic Economizer Cooling System utilizes a Chiller, Closed Loop Evaporative cooling tower, and variable speed pumps packaged with modulating valves to achieve incredible efficiency. The STULZ DEC is not only an infrastructure but a design philosophy to optimize every piece of equipment in order to operate at the highest efficiency and lowest power usage through the entirety of the year. This is achieved using full containment and a warm water cooling strategy maximizing economizer and minimizing chiller assist hours, ensuring that chiller loading is kept to a minimum.

The STULZ DEC Philosophy utilizes full containment to ensure that all heat is captured and returned to the CRAH unit. Capturing all of the server heat increases the return air temperature to the CRAH unit. This increased return air temperature allows the elevation of the supply water temperature. This warmer water temperature allows for increased economizer hours as the warmer fluid temperature is above the ambient temperature for more hours per year.

With the STULZ Dynamic Economizer Cooling system operating under optimized conditions, it becomes clear that the system provide state-of-the-art efficiency and contribute to some of the lowest PUE numbers found in the industry.