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Overall Heat Transfer Coefficient (U-Value)

I've been collecting the data for the heat exchangers in my plant. There 7 plate heat exchangers (PHE) that i closely monitor. There are several more that I do not really focus in. Among the data collected are: inlet & outlet temperatures, flowrate, surface area, and others....My aim is to calculate the "Overall Heat Transfer Coefficient (U-Value)" so that I can know which PHE has become heat transfer ineffcient. However, after a series of data, I observed that sometimes the PHE have high U-value and sometimes the same PHE have lower U-value. And I make a conclusion for myself that the U-value in my case is actually strongly influenced by the flowrate. In my plant, sometimes we have to increase or lower the flowrate due to some quality control issue. Of course, for me the effect of Log Mean Temperature Difference (LMTD) is not as great as the flowrate effect.

I think some other articles that can relate to my experience will be the one published by Cheresources.com in their january 2007 issue.

I hope some of my profesional colleagues who work directly with the theoretical and practical of heat exchanger can comment on this...

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posted by zaki yamani @ 3:43 PM,

5 Comments:

At Friday, January 12, 2007, Blogger Manal said...

U doing ok now, mate.

all that reminded me of oscizik and hewitt's heat transfer books....

 
At Friday, January 12, 2007, Anonymous zaki said...

Ha ha....i forgot about the book, but remembered that moment. That time, I was......what the hell is this "overall heat transfer stuff??!!!!....". But now, I'm working and dealing with it....he he....I wonder what shawal (heat exchanger/transfer lecturer), Suzie (heat exchanger designer) and Fadli (Heat exchanger user like me) will have to say....Well...i discuss a lot of this stuff with my wife at home....and we discuss her freeze concentration pHD project as well....

 
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The Author

zyz

I’m Zaki. I used to be a project, process and chemical engineer. Few years ago I successfully became a Chartered Engineer (IChemE) and Professional Engineer (BEM). I'm now employed as a chemical engineering educator/researcher/consultant. Hope you like reading my blog. I welcome any feedback from you. My email: zaki.yz[alias]gmail.com. TQ!


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