I was wondering if anyone knew the heat transfer coefficient of a thin steel sheet on top of water. It is vital that I find this answer because it is a major part of my research. I found one formula which stated that the U value could be found by using the formula 1/U= x1/k1 + x2/k2. I wanted to know if this formula was correct or if not, what would be a better formula to use. Thanks for the help.