[TRNSYS-users] type 928

[David BRADLEY]

Gabriela,

  There are a lot of possibilities that might cause something like this. 
Things that I would look at are whether there is the correct VENTILATION 
set up in each zone of the building. I have made the mistake a number of 
times in v18 of defining a VENTILATION in TRNBuild but then forgetting 
to select it at the zone level. I would also check the flow rate of 
liquid that is going into and out of the fan coils in the zones that are 
not behaving. It may be that if the zones are all being fed by a single 
pump that there isn't enough flow available to feed all the fan coils 
the amount of liquid that they want.

kind regards,

  David


On 11/12/2020 07:57, gabriela vlad via TRNSYS-users wrote:
> Dear Users,
>
> I'm using type 928 (fan coils) to heat 13 zones of a building.
> For 10 of the zones, the heat transfer takes place from the hot water 
> stream to the air (as it should be), the temperature of the water  is 
> reduce with 3oC and a significant thermal energy is delivered to the air.
> There are some problems with the 3 others zones:
> - for one of them the heat transfer rate is 0 and for two of them the 
> heat transfer takes place in the opposite way (the water is heated 
> instead of being cooled)
> - the air temperature of the zones is used as input (return air 
> temperature) for the type 928; even though the temperature in the 
> rooms is less than 30oC and  the inlet water temperature is 63oC, it 
> seems that for this 3 zones the outlet air temperature is grater than 65oC
>
> Please give some advice regarding this problem!
> Thank you!
>
> Gabriela
>
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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 at tess-inc.com

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

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