Time to cool-down or heat-up water in pipe, heat transfer coefficient
Time to cool-down or heat-up water in pipe, heat transfer coefficient
Rethink, Reinvent . . . design, check and verification tool
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Insulation retards heat flow, but it does not stop it completely. Sometimes, engineers are tasked to estimate the time required for water to cool down to certain temperature (eg, freezing temperature 0 oC). Or find the final water temperature after the system is shut down for an extended period. To do this, ASHRAE formula for transient cooling of water in quiescent condition is used.
Thermal resistance of the insulation layer is the main driver in the heat transfer analysis. Adding more insulation increases the conduction resistance of the insulation layer but decreases the convection resistance of the surface due to the increased outer surface area available for convection.
Determining the convective heat transfer coefficient (ho) of the outside surface is a complex and iterative process that involves several parameters, including wind velocity, air conductivity, pipe dimensions, Nusselt Numbers for natural (free) convection and forced convection. This program automates these tedious calculations, ignoring radiative heat transfer.
Notes: This program is written for SI units only.
A sample of the printable results in pdf can be download here.
OS requirements: Windows 8, 10, 11, ...