PHE Impact is a free-cooling payback analysis program for ARI-certified plate heat exchangers. The interactive program calculates the payback time and energy-savings benefits that can be gained by utilizing waterside economizers in HVAC systems. This program performs a load simulation based on user inputs and contains weather data from more than 50 different U.S. cities. It creates schematic diagrams showing estimated free cooling hours both annually and monthly.

Alfa Laval Inc., 5400 International Trade Dr., Richmond, VA 23231; 866-253-2528;

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