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Re: [EnergyPlus_Support] Re: Pipe:Indoor Pipe Fluid against Ambient Heat Transfer Rate [3 Attachments]
Hello Jean,
Thank you for your answer!
The pipe is a distribution pipe between a constant temperature boiler and several baseboard objects, situated on the inlet branch of the demand half loop. The pipe inlet temperature is practically fixed at 70 °C, so a situation with cold water filling a hot wall does not happen.
In the period where the heating system is always active, the pipe outlet temperature does not fall below 68°C, while the environment temperature is around 20°C.
In this period, the pipe fluid heat transfer rate is always significantly higher than the pipe ambient heat transfer rate.
I do have some isolated HVAC equipment convergence warnings, but the unequality also holds true for long periods without convergence problems.
Reporting at the zone timestep (1/6 and 1/12 hour) yields less smooth curves, but does not help me to understand the results!
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Posted by: robertogrilloait@xxxxxxxxx
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Attachment Converted: "D:\Eudora\Attach\pipe-ambient-heat-transfer-rate.PNG"
Attachment Converted: "D:\Eudora\Attach\pipe-outlet-temperature.PNG"
Attachment Converted: "D:\Eudora\Attach\pipe-fluid-heat-transfer-rate.PNG"