Hi Robert,
I'm not familier with that model in detail. Are we talking about, for example, a hot pipe wall filled suddenly by a cold liquid? The small amount of heat stored in the pipe wall element is bound to transfer toward the liquid faster than the ambient air. If the cold liquid is also flowing, the convection heat transfer coefficient will be much higher than that on the outside pipe wall to ambient air which relies on free convection.
This situation will remain for only a small amount of time until the heat stored in the pipe wall is "exhausted" and the temperture profile across the pipe wall re-establishes itself. At this point we are talking about a steady state again and the heat transfer will be in one direction only. If there is a quick change in temperature now (on either side), the capacitive effects will show again.
I would recommend reporting at timestep or detailed frequency to best see the effects.
Mit freundlichen Grü�en- Sent from my iPhone (excuse the brevity)
i. A.
Jean Marais
b.i.g. bechtold
Tel. +49 30 6706662-23
On 18.05.2015, at 16:36, "robertogrilloait@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
When I look at the average daily values (as in the enclosed image), the peaks do disappear. Still, the Pipe Fluid Heat Transfer Rate is almost double of the Pipe Ambient Heat Transfer Rate. How to account for this?
<indoor-pipe-results-day-averaged.png>
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