[TRNSYS-users] Fan Coil with Water Tank
David BRADLEY
d.bradley at tess-inc.com
Wed Jun 13 09:47:44 PDT 2018
Alice,
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,
David
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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--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
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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