Time Lag Insulation

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df Participant Join Date: Apr 2012 Posts: 4	Time Lag Insulation 04/03/2014 2:42 AM
	How do I calculate the time lag of 4 cm of EPS insulation? Thanks
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lyn Guru Join Date: Oct 2008 Posts: 42355 Good Answers: 1693	#1 Re: Time lag insulation 04/03/2014 2:52 AM
	Look at its thermal conductivity. If I understand your question.
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df Participant Join Date: Apr 2012 Posts: 4	#2 In reply to #1 Re: Time lag insulation 04/03/2014 3:17 AM
	I would like to calculate the time delay due to the insulation, taking into account an external temperature of 32°C and 20°C inside a room.
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IdeaSmith Guru Join Date: Mar 2012 Location: Out of your mind! Not in sight! Posts: 4424 Good Answers: 108	#3 In reply to #2 Re: Time lag insulation 04/03/2014 3:44 AM
	Yes! Thats why you need to look at your conductivity! __________________ Common Sense Dictates
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Fredski Guru Join Date: Feb 2011 Posts: 7025 Good Answers: 207	#4 In reply to #2 Re: Time lag insulation 04/03/2014 8:50 AM
	on what? a wall, a pipe, what?
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df Participant Join Date: Apr 2012 Posts: 4	#7 In reply to #4 Re: Time lag insulation 04/04/2014 2:37 AM
	on a wall.
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nick name Guru Join Date: Mar 2007 Location: City of Light Posts: 3943 Good Answers: 183	#5 In reply to #1 Re: Time lag insulation 04/03/2014 10:01 AM
	*This would be the answer if you would consider a steady state process.* It is a dynamic process so that the parameter to be considered is the thermal difusibility. It takes into consideration not only the conductivity but also the capacity to accumulate (store) heat as product between "cp" and the specific mass of the insulation stuff.. As for the equations they are in almost all books about heat transfer. I use among other the Lienhard latest version (written by the son) which has the advantage to be free for downloading.
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RAMConsult Guru Join Date: May 2007 Location: NYC metropolitan area. Posts: 3230 Good Answers: 444	#8 In reply to #5 Re: Time lag insulation 04/04/2014 12:23 PM
	Great book, thanks for pointing us to it! __________________ “Tell me and I forget. Teach me and I remember. Involve me and I learn.” Ben Franklin.
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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	#6 Re: Time Lag Insulation 04/03/2014 4:58 PM
	Oh, easy. Read-up on heat transfer in something like "Fundamentals of Heat, Mass and Momentum Transfer" by Welty, Wicks & Wilson and apply the contents. It's a book, BTW. __________________ "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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df (2); Fredski (1); IdeaSmith (1); lyn (1); nick name (1); PWSlack (1); RAMConsult (1)

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