Thursday, September 27, 2007
Heat Exchanger design is one of the common activities in plant design. However, although Heat Exchanger is designed in proper manner and follow most of the good engineering & design procedure, yet you might fails to achieve the desired performance by a wide margin. With an understanding of some common reasons why this might happen, designers can avoid these problems in the first place, and troubleshooters can recognize the root causes quickly.
Exchangers for single-phase operation, condensing and boiling are considered in that order here; but as we shall see, exchangers often handle a combination of these, and it is not always obvious which process is causing the problem. In fact, some of these problems are quite unexpected and can even take experienced designers by surprise. It must be recognized that the most important cause of problems in exchangers is excessive fouling. Other articles, books, and conferences have been dedicated to this problem, so fouling will not be addressed here. Instead we consider those exchangers that have failed for some reason other than fouling.
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