Heat transfer project

[YJ97]

University project: So we have been asked to design a rig which basically tests insulation properties of a material. I have been tasked with coming up with a mathematical model to predict temperatures. Unluckily, we will be taught heat transfer in the next semester and I have very minimal knowledge about the subject. I need help, or formulae, to predict the temperature.
Set up:
Heat source :a)Insulation Material(b):: Heat/Temperature Detector
I want to know how can I predict the temperature on (b)side of the insulation wall.

 

[BronYrAur]

YJ97, At least you were forthright that this is homework. Most students try to hide their questions by making it sound as though it is something they are dealing with in industry. This site is NOT for homework assistance! The science and mathematics of heat transfer is very complicated to fully analyze. If you are in an engineering heat transfer class, you will find that out in short order. However, if you are looking at a 1-dimensional steady-state problem, the equations simplify considerably. Do a little research on conduction through a wall.

 

[IRstuff]

For a straight convective heat transfer, the equation is very simple. Finding the parameter to fir the data is the hard part. I would start with Wikipedia:

https://en.wikipedia.org/wiki/Convective_heat_transfer#Convective_heat_transfer

https://en.wikipedia.org/wiki/Heat_transfer_coefficient

Then work your way up:

http://www.cheresources.com/content/articles/heat-transfer/correlations-for-convective-heat-transfer

http://facstaff.cbu.edu/rprice/lectures/htcoeff.html

Simplistically, you can start off with
heat_transferred = area*heat_transfer_coefficient*delta_temperature for the convective part.

Transfer THROUGH your insulation is conductive heat transfer:
heat_transferred = area*thermal_conductivity*delta_temperature/insulation_thickness

Assuming you design the test fixture adequately, it'll depend mostly on area and thickness of the insulation, and the fact that conservation of energy means that the heat transferred across each interface is exactly the same, so you can set up the two simultaneous equations to solve for the temperature and amount of heat transferred, assuming that the hot side of the insulation is fixed at a known temperature, and the air is a known temperature

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert!

https://www.youtube.com/watch?v=BKorP55Aqvg

faq731-376 forum1529 Entire Forum list

http://www.eng-tips.com/forumlist.cfm

 

[YJ97]

Thanks IR, I'll look into it.