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Case Studies

Verizon Data Center

Verizon Sylmar Evaporcool Measurement and Verification for project Verizon Wired, 14385 Polk Street, Sylmar, CA 91342 (Climate Zone 9): Through cooperation with Verizon Wired, Evaporcool and Los Angeles Department of Water and Power (LADPW), a standard M&V test was conducted on a Carrier 50EWQ24 (20 ton) unit serving the Sylmar location of Verizon Wired. The time period of this study was July 15, 2012 until October 30,2012. Pre-project readings were recorded for six weeks initially, and then post project readings were conducted for 8 weeks. The weather was measured on the roof by the unit and the power was measured by recording the power usage of the compressors and the entire unit separately; before and after the installation of the Evaporcool System.

Skybox Data Center

NRG Skybox Data Center in Katy, Texas. Twin 400 ton Trane Air Cooled Chillers fitted with EvaporCool. Energy Savings reduced PUE(Power Utilization Effectiveness) to 1.3 ratio at full load.

The Evaporcool system uses approximately 1.9 gallons of water for each kWh saved, saving approximately 90% of water usage while also saving electricity.

Based on national averages, on a 75-ton HVAC unit, the Evaporcool system will use $78 of water in a year, while saving more than $7,000 annually in electricity.

The National Renewable Energy Lab (NREL) reports that U.S. electricity production consumes more than 20 gallons of water per kWh created.”

Other studies confirm this water usage and state that depending upon the power plant type, the water usage can range from 10 gallons to 25 gallons of water consumed per kWh created.

Beale Air Force Base

University of California case study for Beale Air Force Base Contrails Dining Facility in Marysville, California. EvaporCool pre-coolers were installed on a 50-ton air-cooled chiller at the 15,000 sq. ft. Facility. The project demonstrated the peak-time energy savings, energy savings per year and dollar savings per year for a condenser air pre-cooler over a multitude of possible facility sizes served, and over a large range of chiller and RTU capacities (25- tons to 200-tons) for climate zone 11.

PROBLEM

Standard air-cooled, vapor-compression cooling systems become less efficient and less effective when they are needed most: when it’s hot outside. This is because the compressor must work harder to produce a refrigerant temperature high enough to cause heat to flow from the condenser to the hot outside air. This hard work means more energy consumption and more part wear both lead to increased costs. It also means that cooling causes building electrical demand to peak on hot afternoons, this stresses the grid and can increase building operating costs.

SOLUTION

Evaporative pre-coolers are effective retrofits to reduce the temperature of air that cools the condenser coil in air-cooled chillers, RTUs and other DX equipment. In these systems, the outside air stream passes over a wetted surface before it reaches the condenser, heat from the outside air is absorbed by water evaporation thus cooling the air stream. Evaporative condenser pre-coolers are applicable to most all climate zones, but have even more energy impact in lower humidity areas, such as California.

Evaporcool is one such evaporative condenser-air pre-cooler. The system uses a microprocessor controller to manage the spray of filtered domestic water onto an evaporative media. The flow rate of water delivered changes with outside air temperature and relative humidity so that the system delivers roughly only as much water as is needed for evaporation. The system has no sump, and no drain or water bleed.

Georgia Southwestern State University

EvaporCool pre-coolers were installed on a Carrier Air-Cooled Chiller. The project demonstrated the peak-time energy savings, energy savings per year and dollar savings per year for a con­denser air pre-cooler.

PROBLEM

Prior to Evaporcool, the existing chiller system experienced multiple compressor failures, extremely high liquid line and condenser temperatures, and constant loss of capacity from compressors shutting off due to high head pressures.

SOLUTION

Evaporative pre-coolers are effective retrofits to reduce the temperature of air that cools the condenser coil in air-cooled chillers, RTUs and other DX equipment. In these systems, the outside air stream passes over a wetted surface before it reaches the condenser, heat from the outside air is absorbed by water evaporation thus cooling the air stream. Evaporative condenser pre-coolers are applicable to most all climate zones, but have even more energy impact in lower humidity areas, such as California.

Evaporcool is one such evaporative condenser-air pre-cooler. The system uses a microprocessor controller to manage the spray of filtered domestic water onto an evaporative media. The flow rate of water delivered changes with outside air temperature and relative humidity so that the system delivers roughly only as much water as is needed for evaporation. The system has no sump, and no drain or water bleed.

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