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We have a reboiler whose shell was uninsulated. After insulation, I want to calculate the energy saved (heat saved). Temperature on the reboiler shell surface is ~155oC; on the insulation it is 40oC. Glass wool insulation is installed.
 
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11/09/2020 A: Eric Vetters, ProCorr Consulting Services, ewvetters@yahoo.com
There are simple online tools that you can use to quickly do these calculations. I would treat the exchanger as a piece of pipe for the calculation. You can estimate the losses with and without insultaion. The savings is the difference between the two values.