Heat exchanger structure for a rack assembly formed by a shaped body of thermally conductive material. The heat exchanger structure comprises a first heat exchanging portion adapted to provide a mechanical support for one or more power electronic components of said rack assembly and adapted to absorb and dissipate heat generated by said power electronic components. The heat exchanger structure comprises a second heat exchanging portion adapted to provide a mechanical support for one or more power electromagnetic components of said rack assembly and adapted to absorb and dissipate heat generated by said power electromagnetic components.