Heat exchange – With coated – roughened or polished surface
Patent
1984-07-26
1987-08-18
Davis, Jr., Albert W.
Heat exchange
With coated, roughened or polished surface
291573D, 228117, 228157, 228190, F28F 1318
Patent
active
046870539
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a heat exchanger panel comprised of two selectively clad metal plates, and at least one channel disposed between these plates for a liquid or gaseous medium to be heated or cooled, flowing therethrough.
The invention is used in heat exchangers employed in solar installations, seawater desalination, chemical engineering, and food chemistry, especially in all applications where aggressive or corrosive media are used as heat carriers.
Heat exchangers serve to transfer thermal energy between two liquid or gaseous media at different temperatures, which are to be either cooled or heated.
Flat heat exchangers consist of metal panels comprising one or more channels to receive a medium conducted therethrough. Such heat exchanger panels are used as panel stacks for compact heat exchangers or as large-area single panels, for example to absorb solar energy.
Various designs of heat exchanger panels are known. Thus, for example, German OS 29 02 640 discloses a heat exchanger element with two metal layers made of aluminum, located side by side, and a metal tube disposed therebetween for the heat carrier. Because aluminum is insufficiently resistant to corrosion, the metal tube is made of copper, entailing not insignificant manufacturing problems. In order to manufacture the heat exchanger panel described in German OS 28 47 897, holes must be drilled in a metal block to receive a welding resist, so that the areas of the holes are not welded during the subsequent rolling process, and can then be expanded into channels. The provision of the holes, however, is a rather expensive procedure and several additional work steps are required to remove the welding resist, which is necessary to inhibit undesirable corrosion. Finally, German Pat. No. 21 23 628 teaches a panel-shaped heat exchanger made by pressure welding plating from two strips of an appropriate metal for standard cladding processes; it has a lengthwise channel located in the rolling direction. In the area of this future lengthwise channel, a layer which counteracts welding is applied before bonding to one strip, said layer allowing the channel to be widened. A heat exchanger panel manufactured in this fashion is relatively expensive to make and can be produced only from metals which can be bonded using conventional cladding processes.
The goal of the invention is to design a heat exchanger panel which is less complicated to engineer and less expensive to manufacture, and which can be used in a variety of ways.
To achieve the set goal, a heat exchanger panel of the design described hereinabove is used as the starting point and the goal is achieved by having the panels made of a material which cannot be clad or can be clad only with difficulty using conventional cladding processes, by the fact that an adhesive layer of an amorphous metal is provided between the two strip-like cladding components and on both sides close to the channel, and by the fact that the strips are firmly joined together by cold roll bonding in the area of the adhesive layer. The manufacture of a heat exchanger panel of this kind by the cold bonding method using an interlayer of amorphous metal is very simple and the adhesive layer makes it possible to use metals for panels which could previously be used only by very complicated and expensive cladding processes.
To favor heat transfer, the two strips are advantageously made of copper or copper alloy.
The adhesive layer according to the invention consists of an amorphous nickel, iron, or copper alloy and contains components which delay crystallization, namely silicon, boron, phosphorus, aluminum, and/or carbon.
According to another important feature of the invention, each strip is clad with a cover layer. This cladding procedure may also use according to the idea of the invention, an adhesive layer of amorphous metal.
In an especially advantageous embodiment of the invention, the cover layers on the strips are made of a metal which is resistant to aggressive and/or corrosive media, whereby titanium or a titanium alloy or t
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Fromel Norbert
Paulus Manfred
Davis Jr. Albert W.
Fr. Kammerer GmbH
Neils Peggy A.
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