[TRNSYS-users] Problems with 3 tank simulation

[Cheong Chu Siang Jesper]

I'm trying to model a PVT system which consists of clusters of different PVT modules that cogenerates electricity and hot water for showering.
Hot water storage is achieved using a mains pressured 3 tank system.
However I have not been able to model the 3 tank system using the available storage tank subroutines(type 4, 60, 534).
Tank temperatures obtained are very low when compared to results from a mathlab simulation. 
Mass balance failures are reported in the list file, which i attribute to the incorrect connections between tanks.
I believe the problem lies in the 2 way flow between tanks that is not corrected modelled in the simulation. Is there any way to correct this?
I've attached a simple diagram of the system i'm trying to model.

Does anyone have prior experience with multi tank setups and can provide some guidance?

Thanks,
Jesper
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