Heat exchanger

1. A heat exchanger assembly, comprising:

i) a flooded heat exchanger, comprising:

ii) a primary tube bundle inside which, during use, a first operating fluid flows:

ii) a skirt surrounding said primary tube bundle and adapted to receive a second operating fluid which laps, during use, against said primary tube bundle;

iii) one or more extractable units adapted to be removably inserted inside said flooded heat exchanger, each extractable unit comprising:

a secondary tube bundle inside which, during use, an auxiliary operating fluid flows; and

a first connector for removable connection of the extractable unit to the heat exchanger, said means first connector being adapted to allow insertion of said secondary tube bundle inside the skirt downstream of the primary tube bundle with respect to a flow of the second operating fluid, and

iv) two lateral deflectors shaped as inclined lateral planes fixed to the skirt below one or more of said secondary tube bundles and extending along an entire longitudinal length of the skirt, the two lateral deflectors being configured to channel the second operating fluid towards the one or more of said secondary tube bundles and to act as a guide, along an entire length of the two lateral deflectors, for insertion of the one or more extractable units.

2. The heat exchanger assembly according to claim 1 , wherein said secondary tube bundle extends in a serpentine path, with an outward section and a return section.

3. The heat exchanger assembly according to claim 2 , wherein said one or more extractable units have an inlet and an outlet for the second operating fluid, which are arranged on a same side.

4. The heat exchanger assembly according to claim 1 , wherein said first connector for the removable connection comprises a secondary tube plate.

5. The heat exchanger assembly according to claim 1 , further comprising a second connector for removable fluid connection which is adapted to establish fluid communication between an auxiliary fluid outlet of said one or more extractable units and an inlet for the second operating fluid of the flooded heat exchanger.

6. The heat exchanger assembly according to claim 1 , further comprising a distributor for distributing the second operating fluid inside said skirt.

7. The heat exchanger assembly according to claim 6 , wherein said distributor is a longitudinal distributor arranged upstream of said primary tube bundle.

8. The heat exchanger assembly according to claim 7 , wherein said longitudinal distributor comprises a perforated plate.

9. The heat exchanger assembly according to claim 6 , wherein said distributor comprises one or more transverse distribution elements arranged alongside said primary tube bundle.

10. The heat exchanger assembly according to claim 9 , wherein said one or more transverse distribution elements comprise inclined baffles or partitions.