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Q: U-factor or R-value of stainless steel? ( No Answer,   2 Comments )
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 Subject: U-factor or R-value of stainless steel? Category: Science > Physics Asked by: jahoward-ga List Price: \$3.00 Posted: 28 Oct 2005 15:10 PDT Expires: 27 Nov 2005 14:10 PST Question ID: 586195
 ```I there, I am trying to determine the heat gain into a stainless steel wine tank. Can someone help me determine the R-value or U-factor of stainless steel? Is there a table out there listing the R-values of all types of materials including stainless steel?```
 ```I'm guessing you're going to have to provide more info on the tank. Is it solid stainless, or is there a "cavity", and is that cavity filled with vacuum, air, some other gas? You could probably find the thermal conductivity of stainless steel in a materials handbook. (say, CRC) For 316 steel, its around 16 W/m K (that's meter, kelvin, not millikelvin). The thermal resistance in SI units is then d/k (where d is thickness in meters) or d/16 m^2 K / W -- in other words a thin walled stainless container basically has no thermal resistance (R-value is very small). That's why things like say a Starbucks stainless steel cofee mug is not solid stainless, but has an air gap.```
 ```Thanks for the help. The tanks walls are actually solid stainless. About 1/4" on the bottom and 1/8" on top. I think I found the answer yesterday, which is a U-value of 1.176 BTU/h/ft^2/degree F on a wine tank. Thanks again for your help!```