NOVELTY - The exchanger (1) has a body including a heat exchanging section (A) with a set of circulation passages to circulate calorigenic fluid, and a set of vertical passages (11) to circulate a coolant. Each of additional heat exchanging sections (B-G) of the body has another set of circulation passages to circulate additional calorigenic fluid, and another set of vertical passages to circulate cold coolant. The sections are arranged successively and adjacently in thickness of the body. Inlet heads (100, 112-117) and outlet heads (200, 212-217) of the corresponding adjacent sections are alternated.    USE - Aluminum brazed plate heat exchanger for use in a cooling device that is utilized for cooling a calorigenic fluid such as gaseous helium, air gas e.g. nitrogen, oxygen, argon, neon, krypton and xenon, hydrogen, carbon monoxide, methane, and/or carbon dioxide, by indirect heat exchange with a cryogenic or cold coolant e.g. liquid helium, air gas, hydrogen, carbon monoxide, methane, and/or carbon dioxide, in a tank (all claimed) for a cryogenic separation installation.    ADVANTAGE - The heat exchanging sections are arranged in a successive and adjacent manner in the thickness of the body, thus combining several independent cooling circuits in the single body for cooling different calorigenic fluids in an independent manner. The inlet heads and the outlet heads of the corresponding adjacent sections are alternated, thus increasing the compactness of the heat exchanger. The body limits sudden vaporization of cryogenic coolant in the tank in case of cyclic or alternated functioning of calorigenic circuits. The heat exchanger can be easily installed and supported in the tank by a simple cleat system and a fitting under the body.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic perspective view of an aluminum brazed plate heat exchanger.    Heat exchanging section (A)    Additional heat exchanging sections (B-G)    Aluminum brazed plate heat exchanger (1)    Vertical passages (11)    Inlet heads (100, 112-117)    Outlet heads (200, 212-217)