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