There are two main types of water chiller, one being air cooled, the other water cooled.
Air cooled chillers rely on ambient air for condenser cooling and heat rejection and are generally sited outside at ground level or on rooftops.
Water cooled chillers have a water cooled condenser requiring a source of cooling water supplied either from a water cooling tower or an air blast cooler. Chillers of this type have a much smaller footprint, are generally not designed for installing outside, more usually being located in an internal plant room.
Both types of chiller are suitable for either process cooling or for supplying chilled water to an air conditioning system. Normally, the industrial process chiller will operate with a water leaving temperature of approximately 10°C and an air conditioning chiller at 7°C.