Finned Tube Heat Transfer

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HarryBurt Power-User Join Date: Jul 2007 Location: Cleveland, OH Posts: 445 Good Answers: 10	Finned Tube Heat Transfer 11/13/2007 3:46 PM
	I want to use waste heat from a rubber curing press to heat metal parts to 150 deg F. I assume that the heater will consist of 4 finned tubes 85" long. Steam will be 212 F in and water 210 out, although the actual inlet will probably be higher and the outlet lower. I'd like to get 35,000 BTU/hr, allowing 1 part/min. Is this possible? How do I calculate the finned tube requirement. __________________ "Just a little off the top" - Marie Antoinette
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#1 Re: Finned Tube Heat Transfer 11/14/2007 4:25 AM
	<How do I calculate the finned tube requirement.> By experiment. Start by assuming a heat transfer coefficient for condensing steam of around 2kW/m².degC temperature difference, and go from there. Oh, and heat exchange calculations are nearly always based upon the log-mean temperature difference. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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Ginserbacher Active Contributor Join Date: Aug 2007 Posts: 17	#2 Re: Finned Tube Heat Transfer 11/14/2007 9:57 AM
	It is possible providing you have enough steam. I'm not sure about your 35 MBH. Is that the heat needed just for the parts, or did you include losses? What is your air flow? What is the air temperature going onto the fins? Can you recirculate the air? You are going to need to have the leaving air temperature as high as you can get it. That means the air will have to pass over several rows, like 4 or 6. Are copper tubes & aluminum fins okay? Contact www.srcoils.com and have someone size up a steam coil for you. Let me know what they come up with.
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You might be interested in: BTU Meters, UV Curing Adhesives, UV Curing Equipment

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