Abstract: The absorber has four concentric helical conduits in a housing. A dummy tube is arranged in the housing. The weak coolant solution is conducted in four partial flows through four supply lines to the helical conduits. The profiles of the tube of the helical conduits are of flat oval construction. To ensure that the weak solution is uniformly distributed, on the other hand the individual coils of the helical conduits form a gap in which the solution collects, is conducted downward and redistributed. The heat generated in the absorber is dissipated by a liquid in a secondary system which flows inside the helical conduits.