[Equest-users] modelling DOAS-II

[Xavier García Casals]

Dear eQuest users,
Let me add some more info and some conclusions to the former post on 
'modelling DOAS':
The thermal error introduced in the dummy zone by its difference of 
temperature with OA can be reduced by increasing ACH in the dummy zone 
to a very high value (and increasing COOL-TEMP-SCH to get rid of these 
fictious loads). But then eQuest oversizes the DOAS fan, which will work 
at part load with its real flow.
When introducing ECO and ERV the results show increased errors in 
comparison with the reference case without DOAS (besides, there is a 
high variety of results depending on where ECO and ERV are placed).
These results are using PZS or HVSYS for the DOAS.
As a conclussion I think that there is no way to model the DOAS in 
eQuest keeping a minimum guaranty of accuracy on the results. I could be 
missing something in the many trials I did (I would be thankful if 
someone else indicates me other possibilities I didn't take into 
account), but anyway, the fact of not having at hand the possibility of 
having a look on what is the software really doing in each case, and 
having to guess it from interpreting the detailed reports, it is by 
itself a very error prone procedure that doesn't give many guaranties on 
modelling accuracy.
Regards,
-- 

* *

*Xavier García Casals*

 

*Sistemas** Solares, Eficiencia Energética e Ingeniería Bioclimática** *

*AIGUASOL** INGENIERÍA*

* *

Sistemes Avançats d'Energia Solar Tèrmica SCCL

C/ Palermo, 17. Bajos dcha. 28043 Madrid

Tel: (+34) 91 142 27 88

 

C/ Roger de Llúria,  29 3r 2a 08009 Barcelona

Tel: (+34) 93 342 47 55  Fax: (+34) 93 342 47 56

 

Mobil: 660 22 94 45

xavier.garcia at aiguasol.coop <mailto:xavier.garcia at aiguasol.coop>

http://www.aiguasol.coop <http://www.aiguasol.coop/>

* *

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20080912/88764598/attachment.htm>