[TRNSYS-users] AHU Example with heat wheel and VRV system

[David BRADLEY]

Enrico,

  Would it be possible to adjust the size of the various components of 
your system until the amount of energy required from the grid is zero?

  We run into this kind of situation a lot in developing components like 
batteries. The question is what to do when the battery state of charge 
goes to zero, there is a load, and no electrical input. Should the 
simulation end with an error? If not and the simulation should continue 
then something has to meet the load. The solution (or workaround 
depending on your point of view) that we decided on is to say that in 
this situation, a magical grid supplies the energy needed to meet the 
load. If, in reality that grid is not present then you know at the end 
of the simulation that you were unable to meet the load during those 
times and/or that you have to increase the amount of generating capacity 
(or storage etc.).

I hope that helps!

David



On 11/07/2018 10:25, Chinello Enrico wrote:
>
> Hello,
>
> I’m trying to model in TRNSYS 17 a system that comprises: solar panels 
> + controller + battery + load. I’m trying to keep the model 
> stand-alone, i.e. without any grid interconnection, but I couldn’t 
> figure out how to set my controller to exclude the grid.
>
> Is that possible? If so, how could I do it?
>
> Thanks in advance for your help,
>
> Best regards,
>
> Enrico Chinello
>
> *From:*TRNSYS-users <trnsys-users-bounces at lists.onebuilding.org> *On 
> Behalf Of *David BRADLEY via TRNSYS-users
> *Sent:* mercredi 7 novembre 2018 17:15
> *To:* TRNSYS users mailing list at OneBuilding.org 
> <trnsys-users at lists.onebuilding.org>
> *Cc:* David BRADLEY <d.bradley at tess-inc.com>
> *Subject:* Re: [TRNSYS-users] AHU Example with heat wheel and VRV system
>
> Al-Hyari,
>
>   It is not really possible to know what might be going wrong without 
> running the project. What I would suggest is that you make a new 
> project to which you add only the exhaust and outdoor air fans. Make 
> sure they are the right size by adjusting parameter values and run the 
> simulation using an online plotter to verify that the temperature, 
> humidity and flow rate leaving the fans is as you planned for it to 
> be. Next, add the heat wheel into the system. Again, make sure that 
> the parameters are correctly set so that the heat wheel is 
> appropriately sized to the application. Again, use the online plotter 
> to verify that the temperatures, humidities, and flow rates exiting 
> the wheel make sense. Keep adding one component at a time and 
> verifying as you go.
>
>   kind regards,
>
>  David
>
> On 11/06/2018 05:44, Al-hyari via TRNSYS-users wrote:
>
>     Dear Everyone
>
>     so i tried by my own to build the model for an AHU Equipped with a
>     heat wheel and auxiliary dx coil connected to a VRV System
>
>     i want to know the values of temperature and relative humidity
>     before and after the heat wheel. but there is some mistake that i
>     can not figure it out.
>
>     please advise me what can i do to make the correct model to simulate
>
>     in the attached files you can find the trnsys model and the
>     schematic diagram for the AHU
>
>     Regards
>
>     On Tuesday, October 30, 2018, 3:30:38 PM GMT+1, Al-hyari via
>     TRNSYS-users <trnsys-users at lists.onebuilding.org>
>     <mailto:trnsys-users at lists.onebuilding.org> wrote:
>
>     Dear Colleagues
>
>     It is my pleasure to join this discussing group mail.
>
>     so my question is :
>
>     I am working to simulate an AHU equipped with Heat wheel and an
>     auxiliary dx coil connected to a VRV system.
>
>     I am new on TrnSys and i don't have much knowledge.
>
>     So if any one could help me by sendeng a similar example to study
>     on it and make modification on the block diagram i would be highly
>     appreciated.
>
>     Regards
>
>     Laith F. Al-Hyari
>
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>
>
>
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>
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>
>
> -- 
> ***************************
> David BRADLEY
> Principal
> Thermal Energy Systems Specialists, LLC
> 3 North Pinckney Street - suite 202
> Madison, WI  53703 USA
> P:+1.608.274.2577
> F:+1.608.278.1475
> d.bradley at tess-inc.com <mailto:d.bradley at tess-inc.com>
> http://www.tess-inc.com
> http://www.trnsys.com

-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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