[TRNSYS-users] Fan Coil with Water Tank

David BRADLEY d.bradley at tess-inc.com
Wed Jun 13 09:47:44 PDT 2018


   Three possibilities are worth checking. First, put an online plotter 
on the tank, heat pump, and return water. Plot mass flow and temperature 
into and out of the two ports in the tank so that you're absolutely 
certain that there isn't a small flow going on when there should not be. 
Second, make sure that the capacity of the heating elements in the tank 
are all set to zero so that there isn't any auxiliary energy going into 
the tank. Third (and I doubt that this is contributing) make certain 
that the questions about how many nodes there are in the tank are all 
answered correctly. This question appears in different forms on more 
than one of the Type4 proforma's tabs. In some places you are asked how 
many nodes there are while in other places you are asked how many nodes 
there are in addition to the top and bottom nodes.

kind regards,


On 06/13/2018 11:05, Alice Mugnini via TRNSYS-users wrote:
> Dear TRNSYS users,
> I’m trying to implement a cooling system in a building with fan-coils 
> supplied by cold water from a tank. The tank (Type 4) is previously 
> charged by a heat pump. When it starts to discharge towards the 
> fan-coil (Type 996) and the heat pump is off, the tank temperature 
> rises but it goes also above the ambient temperature, while a constant 
> temperature difference between the supply and return water temperature 
> from/to the fan-coils is maintained. I would have expected that these 
> two temperatures reached the same value and for sure below the ambient 
> temperature. The result has no physical meaning and it seems related 
> to Type 996.
> Has anyone experienced anything similar?
> Thank you for your availability,
> Alice
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> TRNSYS-users at lists.onebuilding.org
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Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

d.bradley at tess-inc.com


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