[TRNSYS-users] Multi-node building modelling with cyclic airflow

[David BRADLEY via TRNSYS-users]

Chris,

   You can absolutely send the airflow into one airnode and return it 
from another. You're on the right track with using coupling between 
airnodes but you don't need to define anything bogus. Create a 
VENTILATION type in the airnode that contains the supply. Specify that 
temperature, relative humidity and flow rate will be inputs to Type56 
and in the Studio, pass the outputs of your conditioning device to those 
inputs. Define a coupling flow rate from the node where the supply is 
located to the node where the return is located. Back in the Studio, 
take the temperature and RH of the air of the return air node as the 
inputs to the return air side of your conditioning system.

best

David



On 08/28/2017 15:31, Christopher McNevin via TRNSYS-users wrote:
>
>
> Hello All,
>
>
> I am wondering if if it possible to model a space with where return 
> air is sent from one node to an air-conditioning system and is then 
> supplied to a different node. This space has a stack of several 
> air nodes. The supply would be at the top, and the return at the bottom.
>
> As far as I can tell, type 56 supplies and returns ventilation air to 
> the same node. Is there a way to get around this?
>
>
> My current thought it to use airnode coupling between each node going 
> down the stack and then adding a bogus node which is set to a 
> temperature and humidity equivalent to the air-conditioners output 
> conditions. This bogus node would then be coupled to the top node. The 
> air-conditioner would use the air temperature and relative humidity of 
> the bottom node as its input air conditions to determine the output 
> conditions.
>
>
> Thanks for your help,
>
> Chris, MASc
>
> Research Assistant
>
> Queen's University
>
>>
>
>
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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

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