Re: Cooling Towers

[Michaël Kummert <kummert@xxxxxxxxxxxxx>]

Dear Inés,

Type 7 models the behavior of a cooling tower in a very simplified way, 
using the "approach temperature". The condensing water temperature 
(Tcond) is set to the ambient wet bulb temperature (Twb,amb) + a fixed 
value (Tapp, the "approach temperature"):
Tcond = Twb,amb + Tapp
I would recommend that you use this simplified approach first.

If you want to model a cooling tower in a more detailed way, you could 
theoretically couple Type 51 with Type 7 by using a "corrected" value 
for Twb,amb (which you would set according to Type 51 outlet 
temperature). Unfortunately, Type 7 is based on empirical correlations 
for two particular absorption machines and many variables are "hidden" 
in the Type, including the condensing water return temperature.
So if you really need to model an absorption cooling machine and a 
cooling tower in detail, I think you will have to adapt those Types or 
use different ones. The TESS libraries include such models, and there 
may be other models available. The "component models" and "TRNLIB" pages 
on the TRNSYS website (sel.me.wisc.edu/trnsys) are a good place to start 
your search.

I hope this helps,

Michaël Kummert

Inés Selfa wrote:

> Dear TRNSYS users,
>
> I'm a very new user of TRNSYS so i have a lot of question but now i want 
> to solve one, How i can link the cooling tower (Type 51) with the 
> Absorption Air Conditioners (type 7)
>
> I'll be very appreciate with your answers
>
>
> Best regards,
>
> Inés Selfa
--
_________________________________________________

Michaël Kummert

Solar Energy Laboratory - University of Wisconsin-Madison
1303 Engr Res Bldg, 1500 Engineering Drive
Madison, WI 53706

Tel: +1 (608) 263-1589
Fax: +1 (608) 262-8464
E-mail: kummert@engr.wisc.edu

SEL Web Site: http://sel.me.wisc.edu
TRNSYS Web Site: http://sel.me.wisc.edu/trnsys