Isometric view of chilled water.

A chilled water system uses water instead of air to cool your home. The water absorbs heat from the home and disperses it outside. The system cools the water down to a temperature of 40 degrees and then circulates it through the water coil's air handler.  Standard chilled water temperature is 6.7°C (44°F) for supply and 12.2°C (54°F) for return. Generally, most chilled water systems operate at a pressure of around 10-12 bar. Some chilled water systems work at more than 16 bar of pressure but they rarely exceed 20 bar. High pressure chilled water systems usually use heat exchange  to reduce the pressure to below 20 bar. For more details download the drawing file.