[Equest-users] eQuest primary secondary loop

[Karl Stum]

OK. Thanks. But, I'm still confused. Below is the input screen for the
Chilled Water Loop. By your statement this "Chilled Water Loop" is, in the
DOE manual and conventional practice terminology, the secondary loop, but
why then is the loop subtype "Primary". I've also pasted in the DOE
definitions below. I understand the meaning of the loop terms, but what I
guess I don't understand is the purpose of the input field "Loop Subtype".

Also, if the Wizard does this correctly and automatically, why do 2 of 4
responses by users to this thread say they can't do a primary-secondary from
the Wizard alone, but have to go to detailed view? I guess I'm a little
frustrated when I can't seem to get to the bottom of things. Thanks for your
help.

 



 



 

 

 

 

 

 

 

 

 

 

____________________________

Karl Stum, PE

360 573 5700 ofc
360 771 0918 cell

Summit Building Engineering

  _____  

From: David S Eldridge [mailto:DSE at grummanbutkus.com] 
Sent: Thursday, February 05, 2009 3:02 PM
To: 'Karl Stum'
Subject: RE: [Equest-users] eQuest primary secondary loop

 

Sorry!  I see here you describe dedicated pumps - so the first graphic from
the wizard is correct, the primary loop is "hidden" from the tree and
graphics.

 

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Karl Stum
Sent: Thursday, February 05, 2009 3:50 PM
To: bfountain at greensim.com
Cc: equest-users at lists.onebuilding.org
Subject: [Equest-users] eQuest primary secondary loop

 

Thanks so much for your response!

I don't really understand what you mean. Your second sentence "So, it
creates primary pumps which push through the chiller, plus secondary pumps
which pump through the system.", isn't that what I'm after for a classic
primary with chillers and dedicated pumps / decoupled secondary with pumps?

My first set up with the Wizard is immediately below. It only shows one
loop. I really question the validity of what the Wizard is doing. 

So, I went into the detailed mode and created another circulation loop and
set it up the way I think it should be, but if that is right, then the 100's
of Wizard set ups by modelers everywhere are messed up, and I doubt that????
See the tree from the detailed set up I did in the second image below. The
problem with that one is I can't get the one coil load to get off the
primary loop and I don't trust it, if it is so different than what the
Wizard sets up.

 



 

DETAILED SETUP CREATING A SECONDARY CIRCULATION LOOP. 

Now chillers are assigned to the primary loop, the secondary loop assigned
to primary loop and loads are assigned to secondary loop (except when I
assign the DDS(B) load to the secondary, it looks OK in the tree, but the
schematic looses the secondary loop altogether??).

 

 



 

 

 

 

_____________________________________

Karl Stum, PE

Summit Building Engineering

2516 NW 91st Street

Vancouver, WA 98665

v. 360 573 5700

c. 360 771 0918

f.  360 573 5155

http://www.summitbe.com

 

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