[EnergyPlus_Support] Pipe:Indoor Pipe Fluid against Ambient Heat Transfer Rate [1 Attachment]

["robertogrilloait@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>]

Dear forum,

I am asking myselves questions about the results I obtain with a Pipe:Indoor object modeling a distribution pipe in a basement.

- Why is the Pipe Fluid Heat Transfer Rate in average significantly higher than the Pipe Ambient Heat Transfer Rate?

Apart from transient effects due the thermal capacitance of fluid and pipe, should not the thermal power coming in at the inlet be roughly equal to the sum of the thermal power coming out at the outlet and of the heat loss to the environment?

- The pipe fluid heat transfer rate exhibits important peaks for days where the mass flow rate through the pipe alternates from null to positive values.

Sure, it also corresponds to the times when the inlet-outlet temperature difference is at its greatest.

Do such important peaks have a physical meaning, in the sense of a reheating of pipe wall?

Thank you for your thoughts on the subject,

Robert

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Posted by: robertogrilloait@xxxxxxxxx

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Attachment not found:
D:\Eudora\Attach\indoor-pipe-results.PNG