Hollow platelet heat exchangers

Abstract

One of these heat exchangers (76) consists of a stack of thin-metal walled hollow platelets (7S1-J5), 12 cm long and 5 wide. Each of these walls has a central region stiffened by alternating bosses with steep slopes, situated between two connection regions. Each wall is made by pressing then cutting an appropriate sheet of metal (aluminium 0.3 mm thick). The edges of the two fin walls form steps, symmetrically welded, the height of each step determining the internal half-thickness of a fin. Each platelet connection region ends in a narrow mouth with a cross section that has the same surface area as the embossed central region, and is welded to the edges of a slot made in an external manifold (80-82). The thickness of the internal channel of a platelet is about 0.4 mm when the fluid concerned is a liquid (water) and that of the spaces between the platelets is 7 mm when the other fluid is a gas (air). By hot pressing or thermoforming, sheets of glass or polymer may also be used but the performance is not as good. A radiator can be made of several exchangers mounted in parallel on each side of two flat main manifolds. Applications: any heat exchangers with high volumetric conduction, low weight and low pumping and ventilating power.

Description

technical field [0001] The present invention is primarily concerned with a heat exchanger consisting of stacked hollow plates of very high performance, i.e. a very high bulk thermal conductivity combined with a small front surface area, low propulsion of the contained fluid The mechanical energy required, and the ability to handle liquid and / or gaseous fluids at relatively high pressure differentials and temperatures. [0002] Secondly, the present invention also relates to a heat exchanger, which is similar to the above heat exchanger, but its overall performance is lower than that of the above heat exchanger, but it is more suitable for some specific purposes. Background technique [0003] Hollow plate heat exchangers have higher performance than solid fin heat exchangers on radiators for heat engines. In fact, for the same bulk thermal conductivity, the gaps between adjacent hollow plates are larger than the gaps between solid fins in such liquid / gas heat exchangers. As...

AI Technical Summary

Problems solved by technology

This would lose most of the envisaged advantage of the low thermal resistance offered by the metal walls

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