Multistaged Indirect Evaporative Cooler

GPG-013, March 2014

Multi-staged indirect evaporative coolers (IEC) use a unique air-processing technology that delivers space conditioning using only a fraction of the energy consumed by mechanical air conditioners. GPG, Rocky Mountain Region, recently evaluated three multistaged IEC systems at the Denver Federal Center to reduce energy consumption by 80 percent, with a simple payback of 22.8 years. Click on the infographic below to enlarge.

GPG Findings 013, March 2014, Multistaged Indirect Evaporative Cooler. Opportunity: How much energy is used for air conditioning in the U.S.? 15% of energy goes to air conditioning. Largest contributor to peak demand, grid failures, and blackouts. Technology: How do Indirect Evaporative Coolers save energy? Remove heat and moisture with unique air-processing technology. 57-92% more efficient than code-compliant roof-top units (RTU). Measurement and Verification: Where did M and V occur? National Renewable Energy Laboratory assessed the performance of 3 multistaged IEC units deployed at the Denver Federal Center in Colorado. Results: How did Indirect Evaporative Coolers perform in M and V? 80% energy savings. Increased water usage (3 gallons/ton-HR) compared to typical RTU. Positive thermal comfort as defined by ASHRAE. Less than 15 years average payback for datacenters. Deployment: Where does M and V recommend deploying Indirect Evaporative Coolers? Dry climates. Data centers: ASHRAE climate zones 2B-6B. Outside air pre-conditioner: ASHRAE climate zones 2b, 3b. Zone cooler: ASHRAE climate zones 4b-6B. [PDF - 351 KB]

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