Time to cool-down or heat-up water in pipe, heat transfer coefficient
Rethink, Reinvent . . . design, check and verification tool
Time2Cool program - Time to cool-down or heat-up water in pipe under no flow condition
> options to find time or final water temperature
> options to include or exclude heat transfer coefficient (outside film ho and/or inside film hi), pipe conductivity
> outdoor ambient temperature can go down to - 40 oC
> built-in pipe dimensions selection for carbon steel pipe (Sch 40 and Sch STD)
> printable results to pdf
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Time to cool-down or heat-up water pipe ... under no flow condition
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.
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.
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Time2Cool
Price: USD 2.00
OS requirements: Windows Vista, 7, 8, 10, 11
(Note: this software does not work on Windows XP).
