[TRNSYS-users] Tank - energy balance

[David BRADLEY]

Amaia,

   There could be two things I think. First, you're right that you need 
to take into account the change in energy stored in the tank. Type4 has 
an output that you can use. Second, make sure you are using a small 
timestep (maybe 5 minutes). With large timesteps you often get problems 
with energy balances.

kind regards,

  David



On 10/07/2018 13:57, Amaia Zuazua Ros via TRNSYS-users wrote:
>
> Hi TRNsys users,
>
> I am simulating a water to water chiller coupled to two storage tanks 
> one each side of the chiller. It's the first time that I work with 
> tanks (I'm using type 4), and I understand that the energy balance 
> should be accomplish, I mean, the total energy coming from the source 
> should be the same than the energy going to the load, but this is not 
> happening in my case with the condenser side of the chiller (the 
> annual totals have around 10% difference) and still the system seems 
> to work (the idea is to simulate a radiative system that dissipates 
> the heat from the condenser). I don't know if it can be related to the 
> internal energy change of the tank. Could some one give a bit further 
> explanation/information about this?
>
> Thanks in advance!
>
> Amaia
>
>
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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

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

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