[Equest-users] Equest-users Digest, Vol 130, Issue 10

Morteza Kasmai morteza.kasmai at gmail.com
Tue Jan 22 10:12:56 PST 2019


Alex,

Thank you so much for your response, your analysis are very helpful.

Regards,
Morteza

Morteza Kasmaei
Senior Architect
LEED AP BD+C, GGP









On Mon, Jan 21, 2019 at 11:21 PM <equest-users-request at lists.onebuilding.org>
wrote:

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>    1. Re: High pumps equivalent full load hours in the model
>       (Chapin, Alex N)
>
>
>
> ---------- Forwarded message ----------
> From: "Chapin, Alex N" <Alex.Chapin at masonandhanger.com>
> To: Morteza Kasmai <morteza.kasmai at gmail.com>, "
> equest-users at lists.onebuilding.org" <equest-users at lists.onebuilding.org>
> Cc:
> Bcc:
> Date: Mon, 21 Jan 2019 13:13:53 +0000
> Subject: Re: [Equest-users] High pumps equivalent full load hours in the
> model
>
> Hi Morteza,
>
>
>
> I looked at the file quickly and it seems that there are some changes that
> you can make to reduce the EFLHs slightly (I was able to get it to 8,146
> hours/year by changing to two-way HW and CHW coils, moving cooling coils to
> secondary loop, readjusting pump flows and power after other changes, and
> setting loop operation to demand), but it seems like the underlying cause
> of the high EFLHs is probably due to having VAV systems which only serve
> interior spaces which are probably going to be in cooling mode year round.
>
>
>
> Note that I think you can model the corridors on floors with residential
> as PTACs also. I believe that the reviewer should allow you to be flexible
> in how you define the corridor off of residential spaces. This might help
> reduce the pump EFLHs for primary and secondary chilled water pumps,
> assuming those VAVs which only serve core spaces are part of what is
> driving the high EFLHs.
>
>
>
> *Alex Chapin* EIT, BEMP, LEED AP BD+C, O+M
> Energy Engineer | Mason & Hanger
> A Day & Zimmermann Company
> *D *804.521.7072 | *O *804.285.4171 | *F *804.217.8520
> 4880 Sadler Road, Suite 300 | Glen Allen, VA 23060
> masonandhanger.com <http://www.masonandhanger.com/>
> *Building a More Secure World*
>
>
>
> *From:* Morteza Kasmai <morteza.kasmai at gmail.com>
> *Sent:* Friday, January 18, 2019 1:29 PM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] High pumps equivalent full load hours in the
> model
>
>
>
> Hello all,
>
>
>
> I received following LEED review comment:
>
>
>
> “The Baseline model pumps equivalent full load hours (determined by
> dividing the total annual pumps consumption (45,761 KWH) by the pump peak
> demand (5.426 KW) reflected in the simulation output report) is 8,433
> hours/year, which is unexpectedly high given the anticipated schedule of
> operation for the project.”
>
>
>
> This is a 9 story residential building with unfinished retail space in the
> ground floor. Primary HVAC system in the baseline case is PTAC and the
> secondary system that serves non-residential spaces is System 7 – VAV with
> reheat and chilled water. HVAC system in unfinished retail space of the
> propose model is System 7 as well. Pumps equivalent full load hours for the
> proposed model is 8,089 hours/year (15,401/1.905), which is close to EFLH
> of the baseline case.
>
>
>
> Is this high EFLH loads relate to the primary and secondary pumps in both
> of the models and are justifiable or there is something wrong with the
> models. Attached are inp and pd2 files of the baseline model from version
> 3.65 build 7173.
>
>
>
> Thank you for your help,
>
> Morteza Kasmaei
> Senior Architect
>
> LEED AP BD+C, GGP
>
>
>
>
>
>
>
>
>
>
>
>
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