When reading about insulation, everyone mentions the R-value of the insulation. But what is R-value? This e-mail explains it. It says that the R-value is the inverse of something called the U-value. The U-value is the ” British thermal units of energy (Btu) that will flow through one square foot of a material at whatever thickness it is, during one hour of one degree Farenheit temperature difference between the air temperatures at the two sides of the material.”
To convert Btu (imperical unit) to Watts (meteric) use: Watts = Btu/hour x
0.293
posted at 20:42 on Fri, 11 Feb, 2005 |
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