Controllable injection for implementing different local refrigerant distribution

A heat exchanger for indirectly transferring heat between a process medium and at least one first refrigerant, comprising:

• a shell which surrounds a shell space and extends along a longitudinal axis;
• and
• a pipe bundle which is disposed in the shell space and extends along the longitudinal axis of the shell from a lower end to an upper end of the pipe bundle in the shell space, wherein the pipe bundle comprises a plurality of pipes which are wound helically on a core tube in several pipe layers in a radial direction starting from an inner pipe layer to an outermost pipe layer;
• wherein the pipe bundle has a plurality of first pipes for receiving the first refrigerant, which first pipes are disposed in different pipe layers of the pipe bundle, wherein the first pipes are wound helically onto the core pipe of the heat exchanger, wherein the core pipe extends along the longitudinal axis (z) of the shell space, and the core pipe carries the load of the pipes of the pipe bundle, and
• wherein the first pipes each have an end which is formed by at least one nozzle via which the first refrigerant can be introduced into the shell space, wherein the ends are disposed along the longitudinal axis of the shell at different heights between the lower end and the upper end of the pipe bundle, and each nozzle is positioned within a layer of the several layers of the pipe bundle.