[Equest-users] PVVT vs. PSZ

[Pasha Korber-Gonzalez]

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
> 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
> 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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