Feeding and removal of pipe streams with interim temperature in coiled heat exchangers

The present invention relates to a helical coiled heat exchanger (1) for indirect heat exchange between first and second fluids comprising a housing (10), a core tube (21) and a tube bundle (2). The housing (10) surrounds a housing chamber (M) for receiving a first fluid and extends along a longitudinal axis (L); the core tube (21) extends in the housing and extends along the longitudinal axis (L); the tube bundle (2) is arranged in a housing chamber and has a plurality of tubes (20) for receiving a second fluid; in a coiled area (W) extending along the longitudinal axis (L), the tubes are spirally coiled around a core tube (21) extending from the lower coil end (E) to the upper coil end (E '). According to the invention, the heat exchanger (1) has at least one tube (200) which is coiled around the core tube (21) only in the section (A) of the coil area (W), wherein at least one tube (200) extends straight to the lower coil end (E) as a straight pipe (200a) along the longitudinal axis (L) below the section (A