Differences between brazed heat exchangers and fully welded heat exchangers
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This post was last edited by chenbinhuai2013 on 2015-6-19 16:14. What are the specific differences between butt-welded heat exchangers and fully welded heat exchangers? As far as I understand, they are both non-disassembleable plate heat exchangers, with the plates being welded together. What other differences are there? Is it related to solder? A existing mixture of carbon dioxide and hydrogen is to be heat-exchanged with carbon dioxide at a temperature of 200°C; is it better to use a brazed heat exchanger or a fully welded one?
What about the design pressure and heat transfer load? The plates of a fully welded plate heat exchanger cannot be removed, but maintenance can be carried out on them in case of leakage; brazing allows only the replacement with a new plate
Brazing is used in environments with low temperatures and low pressures, while welding can be used at higher temperatures and pressures
In brazed heat exchangers, a third material is welded between the plates; this approach is less costly than fully welded heat exchangers, but the area that can be achieved is limited. It’s also best to avoid very large temperature differences, as well as long periods of exposure to such differences
A brazed heat exchanger features a third material welded between the plates; it is less costly than fully welded heat exchangers, but cannot accommodate large areas. The temperature should not be too high, and the temperature difference should not be excessive