Patent ID: 7467467

Claim:
A method of forming a heat exchanger comprising the steps of: forming a flexible heat exchanging assembly by: laying a first flexible sheet composed of heal conducting impermeable material on a support surface; laying a second flexible sheet composed of beat conducting impermeable material in a spaced apart manner over the first flexible sheet to define at least one elongated conduit for a first fluid flow between the first and second flexible sheets; and laying a third flexible sheet composed of flexible heat conducting foam on the second flexible sheet, the hear conducting foam having a plurality of interconnected pores defining a passage therethrough for a second fluid flow; shaping the flexible heat exchanging assembly by deformation into a desired shape, including rolling the flexible heat exchanging assembly into a spiral form, the heat exchanger being a spiralling heat exchanger with the at least conduit and the passage extending spirally; and bonding the flexible heat exchanging assembly together to form a rigid heat exchanger, the at least one conduit and the passage extending in a superposed manner throughout the heat exchanger in heat exchange relationship with one another.