Patent ID: 6758261
Filing Date: 2004-07-06
Classification: F28D,F28F

Abstract:
A heat exchanger for transferring heat between gas flows directed principally counter current, which comprises:walls separating the flows from each other being made of flexible film, through which the heat transfer takes place; and at least one element of the heat exchanger comprising two plastic films and a support film positioned between these films, said films being connected to each other, thus producing parallel flow channels which can be expanded so that the element retains its vertical and horizontal outer dimensions, wherein several of the elements are connected to form the heat exchanger so that free edges of the plastic films of adjacent elements are bonded together, whereby a closed space is formed also outside the elements, and in that the gas flow is directed to an interior of the flow channels with a higher pressure than to exterior for expanding the flow channels, and the heat exchanger can be folded especially for packaging, transport or installation.