e+ does not calculate any pressure drop. You tell e+ what the pressure drop is.
For the air to ground heat exchanger, the loop length will matter, so sub-dividing the zone is more accurate, because the fluid will cool over the length of the pipe effecting the heat transfer in total.
I am supprised that only one pipe is allowed. I have not looked at this object. Let us know what you find.
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 10.12.2014, at 08:49, "marcusbrown1326@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
Hi all,
In my actual building I have an earth-tube system which consists of 7 pipes (50m lenght each) that feed the HVAC system of the building for pre-cooling. But E+ only allows to set up 1 pipe per Zone so I'm afraid that the simulation results may differ from the real performance.I wonder if any of you have encountered the same problem when modelling a ground-air heat exchanger through Earth Tube object in E+So far, only two alternatives I have thought of are:1. Set up and equivalent length (1 pipe of 350m) or2. Divide my room into 7 equal zones and set one EarthTube in each of themFirst alternative I think, it may affect in a wrong way to the pressure drop in the pipe, thus to the Fan Electricity consumptionAs for the second one, I'm not sure if the outlet temperatures coming of the EarthTube will still be consistent according to the actual performance due to air mixings and heat gains.I would really appreciate any comments or solutions.Thank you!!CheersMarcos Perez-Vazquez
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