The invention relates to a
heat exchanger for arrangement in a
pressure vessel having a granular adsorbent material of an adsorption dryer provided for
drying a compressed gas, in particular
compressed air, and for transferring heat of a
heat transfer medium, in particular oil, to the granular adsorbent material, the
heat exchanger has a heating section for transferring heat from the
heat transfer medium to the adsorbent material, and the heating section comprises a plurality of medium lines (1202, 1402), each having at least one medium channel, for guiding the
heat transfer medium in the medium lines, the heating section substantially having a cylindrical shape with a longitudinal axis, the medium lines are arranged in a plurality of line planes in the direction of the longitudinal axis, the medium lines are designed and connected to one another in such a way that the heat transfer medium can flow through the medium lines together in parallel and / or in series, and adjacent line planes and / or the medium lines of adjacent line planes are spaced apart from one another in the direction of the longitudinal axis, the medium line is formed as an extruded profile.