Daikin introduced an integrated water-side economizer (WSE) for its Pathfinder® Air-cooled Screw Chiller. The WSE, providing what is commonly known as free cooling, uses outdoor air to naturally cool water and other process fluids, reducing compressor work and increasing chiller efficiency. It does not require water from a cooling tower, which cuts on water use and costs. The Pathfinder functions in three different modes — free cooling, mechanical, and hybrid — to optimize energy performance and improve PUE. At low ambient temperatures, the WSE coils reject the heat, allowing the chiller compressors to shut down, eliminating power draw entirely.