[TRNSYS-users] Type91 hot/cold side

[Diego A. Arias]

Dear Amandine,

'Hot' and 'Cold' are just labels for two streams. Perhaps, we should 
just called them 'stream 1' and 'stream 2'.  You can give a high 
temperature to the stream labeled as 'cold' without problems.  In this 
type, the user specifies the effectiveness, so the type does not care 
about the configuration of the heat exchanger (parallel flow, cross 
flow, etc.).
The model is very simple, and is based only on energy balance. You have 
to make sure that the temperatures of the outlet streams are reasonable, 
i.e., the outlet temperature of the stream that had a higher inlet 
temperature should be higher than the temperature of the other stream.
Best regards,

Diego

Amandine LE DENN wrote:

> Dear TRNSYS users,
>  
> I am using Type91 as heat exchanger; I am afraid of misunderstanding 
> what are "Hot side" and "Cold Side".
> Is it a matter of temperatures' levels ? then what happen when both 
> parts need same temperatures?
> or is it a matter of primary system and secondary system (one is on 
> the left side, the other is on the right side) ?
>  
> Thank you for your answers,
> Kind Regards,
>  
> Amandine LE DENN
> INSA Toulouse
> Mel: amandine.le-denn at tecsol.fr <mailto:amandine.le-denn at tecsol.fr>
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-- 

Diego A. Arias
TRNSYS Coordinator
Solar Energy Laboratory
University of Wisconsin - Madison
1500 Engineering Drive
Madison, WI 53706