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I am trying to calculate the heat loss of a capsule (mini submarine), size is 6m long and 0.5m radius of the ends and a height of 3m. I found a formula for calculating heat loss but it requires an R-value which I don't have, H = A(Thot-Tcold)/R (I'm guessing this is for insulated bodies)

The tank is uninsulated. I got some numbers using a Thermal Imaging Camera, Min temperature is 25 degC and Max is 114 degC. The emissivity is 0.95. The water inside the tank is heated using steam from about 20 degC to 120 degC. Ambient temperature is 25 degC.

I have been at it for 2 days now and can't get anywhere, maybe I'm looking at this the hard way. Is there a simply formula for heat loss of uninsulated bodies? Will the emissivity be used in this calculation?

Any help is greatly appreciated.

Thanks