Abstract: Air conditioning unit for a structure defining a space to be conditioned, the air conditioning unit comprising a structure comprising a lateral wall and a pair of terminal walls connected together to defining a space and a first and a second openings realized in a wall opposite to lateral wall and configured to be faced to respective openings realized in structure, the air conditioning unit housing an air conditioning arrangement housed within space and comprising a cooling coil, first ventilation means and second ventilation means, the air conditioning unit comprises at least a divider wall configured to divide the space into at least two portions and is configured to comprise a free cooling arrangement provided with a first and a second dampers suitable to be housed within one between first and second openings of structure and a third damper suitable to be housed through lateral wall.

Abstract: An air conditioning system includes: a heat source unit; an indoor unit; a water circuit configured by connecting a supply pipe and a return pipe; a flow rate adjusting valve provided in the water circuit; a supply air temperature control unit configured to adjust a flow rate of the flow rate adjusting valve; a pump provided in the water circuit; a pump controller configured to control a rotation speed of the pump; a return water temperature sensor; a supply water temperature sensor; a supply water temperature control unit; and a target supply water temperature updating unit configured to change a target supply water temperature to which a supply water temperature detected by the supply water temperature sensor is to reach based on a temperature difference between a return water temperature detected by the return water temperature sensor and the supply water temperature.