Heat exchanger

Abstract

A heat exchanger assembly and method for making the assembly. The assembly includes a pair of plates having longitudinal grooves which are joined together with the grooves mating with each other to define fluid-carrying channels extending between the ends of the plates for receiving a heat exchange fluid. The plates include an engaging intermediate surface between certain channels and the fluid-carrying channel passages may be arranged in groups having a laterally spaced relationship from each other. Header means having orifices for connection to the fluid-carrying channels are at each end of the plates for providing a continuous closed path. The plates and channels are coiled to extend about and around one of the header means which provides a circular configuration. The grooves in one of the plates include bosses for providing self-spacing of adjacent convolutions of the channels and plates. Additionally, there is disclosed a method of making the above-described heat exchanger assembly including the steps of rolling longitudinal grooves in a pair of plates on a common mill and forming intermittent bosses in one of the plates, crossing over the plates and mating the longitudinal grooves to define fluid-carrying channels, simultaneously seam welding the plates together, dipping in a plating solution, cutting to a desired length, joining the channels at each end of the plates to a header means, and coiling the plates and channels by bending transversely to the longitudinal extent to extend the plates and channels about and around one of the header means to provide overlying convolutions of the plates and channels.