AZEVAP Integrated Displacement Evaporative Cooling System

Best available option for cooling Industrial Facilities - AZEVAP Integrated Displacement Evaporative Cooling System. This system delivers significant quantifiable benefits in multiple areas that result in a strong life cycle cost based business case. Namely:

• Improved work area temperatures drive improved productivity of workforce
• Reduced building flow rate results in fewer evaporative coolers and exhaust fans for lower capital costs
• Reduced electrical power usage – driven by lower building flow rate, more efficient blowers, and integrated controls to match building flow rate with outside conditions
• Reduced water usage – driven by lower building flow rate, reduced bleed water, and integrated controls to match building flow rate with outside conditions
• Reduced maintenance costs – driven by fewer coolers, low maintenance evaporative coolers, and low maintenance exhaust fans

The AZEVAP Integrated Displacement Evaporative Cooling System consists of AZFlow evaporative coolers, ducts with long throw diffusers, AZEVAP Exhaust Fans, and AZCONTROL. The specific cooler models and configuration of these components is dependent on the location, mission, heat loads, and character of the facility. However, they all share the unique feature of discharging cooler outlet air into the building through long throw distribution diffusers that distribute air at cooler outlet temperature directly to the work area floor. The velocity profile and flow path of this air is also controlled such that the work area air velocity is ~ 150 fpm with airflow from operator areas to heat sources and then out of the building. Using this criterion the building air volume change rate is typically ~ 4 to 6 changes per hour.

This is different from the design found in other industrial facilities where the distribution ducts and diffusers are designed more like those for an air conditioned office building with discharge registers designed to restrict the throw distance and mix the incoming air with the air in the building before reaching the work area. Under these conditions the work area temperature is close to the average building temperature. The building air volume change rate is typically set at 8 to 10 changes per hour to influence both the average building temperature and the work area temperature.

A comparison of the resulting cooling season work area temperature profile for a facility located in Phoenix, AZ for the typical recirculating cooling system and the AZEVAP integrated displacement evaporative cooling system is shown in the figure below.

Typical facilities where this system has been installed and displacement cooling performance expectations achieved are shown in the figures below.