[Hap-users] Water Chiller and relative Pumps-System 8

Intertecno - Giusy Amorusi giusy.amorusi at intertecno.it
Tue Mar 17 01:27:40 PDT 2015


Dear All,
I’m modelling a water centrifugal chiller in System 8 of ASHRAE 90.1
(Appendix G), using HAP by Carrier, for a LEED Certification (LEED C&S
2009).
I have to need how calculate the minimum entering condenser water
temperature (ECWT) for a water-cooled chiller and the part-load ratio below
which cycled operation occurs. This cycling point is defined as a
percentage of full load capacity. How I could calculate these data? Should
I consider 21 °C as minimum temperature?

About Cooling Control I understand that 2 chiller equally sized have to be
equally unloading. Am I right?

No instructions are given for Cooling Tower: Full Load Fan kW, fan
electrical Efficiency and % Airflow at Low fan Speed. Where can I get these
data?

Then I have to model the Primary/Secondary Systems with variable-speed. In
my case the building has a floor area more than 20,000 m2.
I have to put in the software the “Mechanical and Electrical efficiency”
and the “W/L/s” for both pumps in Primary Loop and in Secondary Loop.
How could I calculate the data for the two loops?
The ASHRAE in the Section G3.1.3.10 gives me only 349 kW/1000 L/s but not
the other data.

Moreover I have to put in these data for the secondary loop: Control Head
(kPa) and Minimum Pump Flow (%).


Thanks.





[image: INTERTECNO_cmjn_300dpi]

*Giusy Amorusi*

Ufficio Tecnico Meccanico

*Intertecno S.p.A.*

Viale Marche, 13 – 20125 Milano (Italy)

Tel.: +39 02 60 790 290 - Fax: +39 02 60 790 200 – Cell. +39 334 68 38 143



*www.intertecno.it* <http://www.intertecno.it/>



[image: intertecno_02_2015_2]





Il contenuto e gli allegati del presente messaggio possono essere riservati
e sono destinati esclusivamente a coloro cui sono indirizzati. La natura
dei messaggi di posta non è personale e le comunicazioni potranno essere
conosciute all’interno dell’organizzazione aziendale. La diffusione, la
distribuzione e/o la copiatura del documento trasmesso da parte di
qualsiasi soggetto diverso dal destinatario sono proibite. Le opinioni
espresse sono quelle dell'autore. Intertecno S.p.A. non assume alcuna
responsabilità sul contenuto del presente messaggio, il quale non
costituisce un impegno contrattuale tra Intertecno S.p.A. e il
destinatario. La sicurezza e la correttezza del messaggio non può essere
garantita. Se questo messaggio è stato ricevuto per errore, si prega di
distruggerlo con gli eventuali allegati e di contattare immediatamente
Intertecno S.p.A. Grazie.



This message and any attachments may be privileged and confidential and are
intended exclusively to the recipients. They are not personal but
business-related and other members of Intertecno S.p.A. might have access
to their content. If you are not the intended recipient, you cannot
circulate, distribute or copy the document. The opinions expressed in this
message belong to its author. Intertecno S.p.A. cannot be considered liable
for the content of this message, which does not qualify as a contractual
engagement between Intertecno S.p.A. and the recipient. Security and
correctness of this message cannot be guaranteed. If you are not the
intended recipient, please contact immediately Intertecno S.p.A and delete
this message and any attachments without retaining a copy. Thank you.



Prima di stampare, pensa all'ambiente -- Think about the environment before
printing
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/hap-users-onebuilding.org/attachments/20150317/b2a1cc46/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.jpg
Type: image/jpeg
Size: 2534 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/hap-users-onebuilding.org/attachments/20150317/b2a1cc46/attachment.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image002.jpg
Type: image/jpeg
Size: 6560 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/hap-users-onebuilding.org/attachments/20150317/b2a1cc46/attachment-0001.jpg>


More information about the Hap-users mailing list