Additively manufactured miniature heat exchanger

Miniature heat exchanger
© Fraunhofer IWU

This counterflow water/water miniature heat exchanger was designed for and manufactured by laser beam melting in order to demonstrate achievable efficiency compared to conventional plate heat exchangers.

The inlets with a diameter of  6mm fan out into 10 channels of 2 mm in diameter and a total length of 400 mm.

Each channel is meandering with 7 directional changes of 180°, having a distance of only 1.5 mm to each other. This leads to a very compact design while maximising the surface area.


Technical details:

  • AM-Technology used: Laser Beam Melting (LBM)
  • Material: AlSi10Mg
  • Dimensions: 60 x 60 x 60 mm³
  • Weight: 0.5 kg
  • Heat Transfer Surface Area: 505 cm²
  • Heat Transfer Performance: 2kW (at 50°C / 26° C and
    2.1l / min)



Concept Study / Demonstrator


Fraunhofer IWU, Nikolaus Milaev,, +49 351 4772 2921