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Heat Exchange Element and Process for Production

a technology of heat exchange element and process, applied in the direction of liquid/solution decomposition chemical coating, light and heating apparatus, coating, etc., can solve the problems of good heat exchange properties, achieve the effect of reducing fragility and/or peeling of deposited coating, promoting heat transfer from the surface, and convenient formation

Inactive Publication Date: 2020-05-28
OXFORD NANOSYST LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent is about a new coating for heat exchange elements that can be easily applied using a process called electroless deposition. This process involves using a solution containing metal ions to coat the surface of a substrate. The inventors found that the flow of the solution over the surface removed hydrogen bubbles quickly, reducing any issues with peeling or fragility of the coating. The resulting coating is rough, which promotes heat transfer, and can have regions of different spike length. This process can be used to retrofit an existing heat exchanger without disassembly and minimizes waste of material.

Problems solved by technology

Moreover, the flow of electroless deposition solution unexpectedly still provides a rough surface suitable for promoting heat transfer from the surface.
This finding is unexpected as it was previously thought that the flow process would lead to an irregular structure of the coating, that would not have such good heat exchange properties.

Method used

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  • Heat Exchange Element and Process for Production
  • Heat Exchange Element and Process for Production
  • Heat Exchange Element and Process for Production

Examples

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examples

[0290]1. Preparation of sample coatings.

[0291]Small test pieces of copper were coated according to the method of the invention using the bath process protocol (protocol 1), above. The coating times were varied to achieve different spike lengths. At least 100 ml of nanoFLUX solution was used in each case. The resulting heat exchange elements according to the invention were images using scanning electron microscopy (SEM). The results are shown in FIG. 3 (ordinary protocol) and FIG. 5 (protocol modified to produce clusters).

[0292]FIG. 3(a) shows a coating comprising spikes of 1 to 3 μm in length, obtained by subjecting the test piece of copper to a bath of nanoFLUX solution for up to 1 hour. FIG. 3(b) shows a coating comprising spikes of 4 to 5μm in length, obtained by subjecting the test piece of copper to a bath of nanoFLUX solution for approximately 2 hours. FIG. 3(c) shows a coating comprising spikes of 8 to 10 μm in length, subjecting the test piece of copper to a bath of nanoFLUX...

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Abstract

The invention provides a heat exchange element comprising a substrate and a coating, wherein the coating is present on at least a part of a flow path defined by the heat exchange element. The coating comprises a metal and has a structure comprising spikes having a length of up to 100 μm; the average length of the spikes various throughout the coating. The invention also provides a method of transferring heat to or from a fluid which comprises providing the fluid to a flow path of the heat exchange element of the invention. The invention further provides a process for producing a heat exchange element of the invention, wherein the process comprises providing an electroless deposition solution to a surface of a substrate. The invention further provides a flow process for producing a heat exchange element and a heat exchange element obtained or obtainable by that process.

Description

FIELD OF THE INVENTION[0001]The present invention provides a heat exchange element which facilitates efficient heat transfer. The invention also provides a method of transferring heat to or from a fluid using a heat exchange element of the invention. Processes suitable for producing heat exchange elements, including the heat exchange element of the invention, are also provided, in particular an electroless flow deposition process. The invention also provides a heat exchange element obtained or obtainable by the electroless flow deposition process.BACKGROUND TO THE INVENTION[0002]The transfer of heat across surfaces is of importance in many products and systems. Examples of such systems include cooling systems (such as air conditioning systems or refrigeration systems) and heating systems such as boilers. Other examples of such systems include heat recovery systems. A typical configuration of an apparatus for heat exchange in such a system involves the transfer of heat between a heat...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F28F13/18C23C18/38C23C18/16C23C18/18
CPCC23C18/1844C23C18/38C23C18/1616F28F13/187C23C18/1669C23C18/32F28F2215/04C23C18/1893F28F13/185F28F21/089F28F2245/00
Inventor DOBSON, PETERREIP, ALEXANDERANDERSON, ANDREWBULLEN, TIM
Owner OXFORD NANOSYST LTD
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