The selection criteria for the hybrid fluid cooler considered year-round temperatures. Summer duty had an entering water temperature of 95°F (35°C) and a leaving water temperature of 85°F (29°C). In winter, the wireless provider could use the fluid cooler for direct free cooling, meaning it could send water directly through the fluid cooler, bypassing the chiller. Entering water temperature was 55°F (13°C) and leaving water temperature was 44°F (7°C).
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