Spiral heat exchanger

A spiral heat exchanger including at least two spiral sheets (1, 2) extending along a respective spiral-shaped path around a common centre axis (x) and forming at least two spiral-shaped flow channels (4, 5), which are substantially parallel to each other, wherein each flow channel (4, 5) includes a radially outer orifice, which enables communication between the respective flow channel (4, 5) and a respective outlet/inlet conduit (15, 16) and which is located at a radially outer part of the respective flow channel (4, 5) with respect to the centre axis (x), and each flow channel (4, 5) includes a radially inner orifice, which enables communication between the respective flow channel (4, 5) and a respective inlet/outlet chamber (13, 14), so that each flow channel permits a heat exchange fluid to flow in a substantially tangential direction with respect to the centre axis (x), wherein the centre axis (x) extends through the inlet and outlet chambers (13, 14) adjoining the radially inner orifices, wherein the spiral heat exchanger includes a mainly circular, cylindrically shaped centre body (3) extending around the centre axis (x) and being substantially closed with respect to the flow channels (4, 5) and the inlet/outlet chambers (13, 14).