Re: [EnergyPlus_Support] Modeling Active Chilled Beams

[Wenting Ding <dingwenting@xxxxxxxxx>]

Hi, Jean,

I also want to use Plate heat exchange to model radiant floor system, but it doesn't work properly. I don't know why. I want to try the method you mentioned. For chilled water, I can use thermal storage:chilled water:mixed, For hot water, which object should I use?

Could you give me some advice? Thank you.

2013/2/12 Jean Marais <jeannieboef@xxxxxxxxx>

 

1) "This loop architecture is not possible within energy plus."-correct. As far as I am aware only one componant per branch is allowed. Are there exceptions? I think a pump object possibly.
2) Thermodinamically, the energy used by the users (AHU cooling coil and chilled beam) will equate to the same amount. However, you'll need to supply them seperately. I suggest using one demand side branch to supply the AHU with say 6 degC chilled water and another demand side branch to supply a ThermalStorage:ChilledWater:Mixed object. This ThermalStorage:ChilledWater:Mixed object becomes the "chiller" in your second plant system which can now supply your chilled beam objects with chilled water at temperatures of say 18 deg C.
3) #2 is not the only solution...I believe the newest versions of e+ also use plate water-water heatexchanger objects now.
If you need more help please see earlier posts from Marko Ignjatovic who posted earlier in the forum. He's grasped the logic of this kind of solution well (all be it for the hot water scenario).
regards,
Jean.

On 30 January 2013 01:50, k0bes88 <alexander.kobler@xxxxxxxx> wrote:

 

Hi there,

I'm trying to model an office tower that is conditioned by active chilled beams. I am having an issue with the sequencing of systems on the Chilled Water Loop Demand Side. The intent is for the chilled water to serve the Air Handling Units first. The water on the secondary return mixes together after the AHUs, then serves the chilled beams at a higher temperature before returning to the chillers.

It appears this loop architecture is not possible within energy plus.

Do you have a recommended method for modelling chilled beams, given they cannot be modeled in parallel or series on the secondary demand loop?

Any assistance or work-arounds would be greatly appreciated!

Thanks,
Alex

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