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Re: [TRNSYS-users] Fan Coil with Water Tank

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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David BRADLEY
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