Heat exchanger of the plate type

Abstract

A heat exchanger of a structurally self-supporting plate type and provided with an internal flow passage constrained between a first and a second plate and extending between an inlet and an outlet; The flow passage is subdivided in multiple generally parallelly directed longitudinally extending channels with the longitudinally extending channels having continuous joints formed by the two plates; The longitudinally extending channels have an arch-shaped cross-section and the arch-shape of the plates of the channels is in the same face direction orthogonal to the plates; The parallel running longitudinally extending channels include several laterally directed arches relative to their main axis in their longitudinal extension.

Description

[0001]The present invention is a heat exchanger of a structurally self-supporting plate type provided with an internal fluid passage between a first and a second plate (2, 3) whereof at least the first of the plates (2) is arranged to be exposed to a warmer or colder medium.BACKGROUND ART[0002]Swedish patent SE 533035 shows a heat exchange element of the plate type, with an internal fluid flow passage comprising two plates between an inlet and an outlet, and an interior passage that forms an extension between the inlet and outlet, where the passage is constrained between two parallel plates that are formed by a self-supporting polymer material. The two plates are joined with a number of point weldings distributed over the fluid passage area. A disadvantage of the Swedish patent is that the point welding process results in a quite flat surface. Such a flat surface reflects sunlight from the plate, particularly when the angle of the sun is inclined. An inclined sun angle also provides...

AI Technical Summary

Benefits of technology

[0013]In an advantageous embodiment of the invention the exposed plate (2) is formed in a heat conductive material, which increases the efficiency if the heat exchanger is used e.g. as a “sunlight collector”.

[0014]In an advantageous embodiment of the invention the second pate (3) is thermally insulated to reduce heat loss if the heat exchanger should increase the temperature of the through flowing fluid, or to control the heat loss towards only one side of the heat exchanger, if it is a wall installed radiator for heating in a house.ADVANTAGES OF THE INVENTION

[0015]An advantage of the crescent-shape of the cross-section of the channels (7) is that a ratio of exposed surface area to volume of contained liquid is high, thus it has a large exposed area relative to the weight. This is an advantage if the panel is to be mounted as roof panels on a roof to collect sunlight, or if mounted as ceiling panels without having to increase the dimensions of existing girders.

[0016]The feature that the generally parallelly running longitudinally extending channels (7) comprise several laterally directed arches kinked about 45 degrees relative to their main axis in their longitudinal extension, please see FIG. 4, will make the cross-section of one channel (7) in one section plane partially overlap a cross-section of another channel (7) in another section plane, thus increasing the panel's bending stiffness about the general longitudinal axis of the channels. Further, a kink angle of 45 degrees is a good compromise to allow several parallelly running channels.

[0017]In an embodiment of the invention the longitudinally extending channels (7) have a corrugated surface generally across the longitudinal direction. This create microturbulence in the through flowing fluid, which promotes heat transfer from the wall to the contained through flowing liquid or vice versa, which is an advantage.

Problems solved by technology

A disadvantage of the Swedish patent is that the point welding process results in a quite flat surface.

Another disadvantage is that the point weldings easily detach when the fluid is pressurized, incurring delamination of the plates.

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