| 摘要 |
A heat exchanger for solar collector apparatuses comprises two metal layers (10, 11) abutting each other and at least one metal pipe (12) for a heat-carrying medium arranged between the layers. The metal layers are cold-welded together on either side of the pipe to form heat-conveying fins and the pipe is cold-welded to at least one of the metal layers. The exchanger has a greater total goods thickness at the pipe than at the fins to allow a comparatively high heat-carrying medium pressure. (FIG. 1). For manufacturing the heat exchanger two metal strips and a metal pipe are continuously fed between two rolls, of which at least one is provided with a groove corresponding to the pipe. The roll pressure is selected so that the metal strips and the metal pipe are subjected during cold rolling to a thickness reduction of at least 60% during the passage between the rolls, so that the strips and the pipe are cold-welded together. |
