Most large buildings use air handlers with chilled water coils.
Every ton of cooling delivered this way requires 2.4 gpm of water flow. Increasing the coil surface area to permit higher chilled water supply temperatures, 3. These factors can impact energy use in complex ways. The chilled water flow is now only 1.2 gpm per ton, providing significant savings in chilled water distribution piping and pumps. However, producing 38 F water potentially requires more power and more expensive chiller designs.