[Equest-users] PVVT vs. PSZ

[Nicholas Couture, LEED AP]

Pasha,
 
I've attached the models of each.  After reading thru the topics on the
PVVT system, I think I may have modeled it wrong it regards to the
zoning, they recommend grouping zones served by one unit into one zone,
whereas I had modelled each zone with a VAV box separately.
Additionally my previous presumption was wrong, because when I turned
off all baseboards for both models, I still got the same results, that
is more gas usage at the systems with PSZ than PVVT, which is puzzling
to me.   
 
If anyone can untie this knot I created, it would be greatly
appreciated.
 
thanks,
 
Nick Couture, LEED AP
Mechanical Engineer  

 

3555 Veteran's Memorial Highway, Suite M
Ronkonkoma, NY 11779
Tel:  631.981.3990 ext. 230
Fax: 631.981.3971
ncouture at emtec-engineers.com


www.emtec-engineers.com <http://www.emtec-engineers.com/> 

This message is intended only for the personal and confidential use of
the designated recipient(s) named above. This is not in anyway an
official statement of Emtec Consultants or solicitation to buy our
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to be secure or error-free. Any reproduction or changes to our drawings
and files without the consent of Emtec Consultants is strictly
prohibited.
 

________________________________

From: Pasha Korber-Gonzalez [mailto:pasha.pkconsulting at gmail.com] 
Sent: Wednesday, April 28, 2010 11:02 AM
To: Nicholas Couture, LEED AP
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] PVVT vs. PSZ


Hi Nick,
 
based on my brief skimming through the descriptions of the system types
you are working with (see attached docs.)  I concur with your
explanation if it is the case that you have specified or 'turned on'
baseboards in the specific zones that are not the control zone for the
system.  If you do not have the baseboards turned on in your model then
your heat energy is coming from somewhere else.  If you attach your .pd2
& .inp files we can look at your inputs and give you some specific
feedback on your model file.
 
Also, have you looked at your 'hours out of throttling range' for these
adjacent zones?  Look at your BEPS/BEPU reports and the SS-F or SS-R
reports as well.  Maybe they are significantly underheated, or maybe
they are already satisfied for thier thermal conditioning
requirements....its good to just confirm this.
 
pasha


On Wed, Apr 28, 2010 at 6:53 AM, Nicholas Couture, LEED AP <
ncouture at emtec-engineers.com> wrote:


	I'd like to propose an answer my own question to the group and
ask if this makes sense... I'm getting additional baseboard heat in some
of the PVVT zones. 
	 
	Take the several zones a unit serves.  One of them is the
control zone, same for PSZ and PVVT.  For a PSZ when the control zone is
satisfied the other zones are also satisfied, because there is no
additional baseboard heat, the constant airflow must be keeping the
other zones satisfied.  For a PVVT the control zone is satisfied, and
airflow reduces and the other zones are not satisfied requiring
additional baseboard heat.
	 
	 
	Nick Couture, LEED AP
	Mechanical Engineer  

	 

	
	

	3555 Veteran's Memorial Highway, Suite M
	Ronkonkoma, NY 11779
	Tel:  631.981.3990 ext. 230
	Fax: 631.981.3971
	ncouture at emtec-engineers.com
	

	www.emtec-engineers.com <http://www.emtec-engineers.com/> 

	This message is intended only for the personal and confidential
use of the designated recipient(s) named above. This is not in anyway an
official statement of Emtec Consultants or solicitation to buy our
services. Emtec Consultants does not guarantee this Email transmission
to be secure or error-free. Any reproduction or changes to our drawings
and files without the consent of Emtec Consultants is strictly
prohibited.
	 

________________________________

	From: equest-users-bounces at lists.onebuilding.org [mailto:
equest-users-bounces at lists.onebuilding.org] On Behalf Of Nicholas
Couture, LEED AP
	Sent: Tuesday, April 27, 2010 4:39 PM
	To: equest-users at lists.onebuilding.org
	Subject: [Equest-users] PVVT vs. PSZ
	
	
	Hello,
	 
	I'm comparing a PVVT against PSZ systems in the DD wizard mode.
On the heating side I'm keeping everything the same, that is furnaces at
80% AFUE and baseboard, all heating settings including the boilers are
set up the same.  I'm getting more fuel use for the PVVT system than the
PSZ system.  Can anyone explain why that is?
	 
	thanks,
	 
	Nick Couture, LEED AP
	Mechanical Engineer  

	 

	
	

	3555 Veteran's Memorial Highway, Suite M
	Ronkonkoma, NY 11779
	Tel:  631.981.3990 ext. 230
	Fax: 631.981.3971
	ncouture at emtec-engineers.com
	

	www.emtec-engineers.com <http://www.emtec-engineers.com/> 

	This message is intended only for the personal and confidential
use of the designated recipient(s) named above. This is not in anyway an
official statement of Emtec Consultants or solicitation to buy our
services. Emtec Consultants does not guarantee this Email transmission
to be secure or error-free. Any reproduction or changes to our drawings
and files without the consent of Emtec Consultants is strictly
prohibited.
	 

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