[Equest-users] On site renewable energy NC v2.2

[Caballero, Catalina]

In regards to this below, I was wondering, do PV have to be subtracted from energy cost or production from the energy model report (if one uses RETscreen or PVSyst or PVWatts) and that total be reported on the NCv2.2 EAc1 template, or it does not have to be  shown there but only on EAc2, or it's shown in both. It is a bit confusing.

Regards,


Catalina Caballero, AIA. Assoc., LEED GA.
Johnson, Avedano, Lopez, Rodriguez & Walewski
Engineering Group, Inc.

2510 NW 97th Avenue, Suite 220, Miami, Florida 33172
Tel. (305) 594-0660 Ext. 217 Fax (305) 594-0907

Visit us online: www.jalrw.com<http://www.jalrw.com/>

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HVAC - Electrical - Plumbing - Fire Protection
Sustainable Development - Commissioning


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From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Busman, Michael R
Sent: Monday, October 01, 2012 9:29 AM
To: Nick Caton; Karen Smith
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] On site renewable energy NC v2.2

I seem to recall that the PV inputs in eQUEST can be quite overwhelming.

I agree with Nick that an outside software tool should be used.  RETScreen is a very good tool, however, it will give you annual production totals.  Another approach is to use an online tool such as PV Watts.  It requires minimal inputs and you can download hourly production numbers.  These could be dropped into an hourly report spreadsheet along with time of use rates to obtain the net hourly electricity used or exported as well as cost.  The value of each kWh exported might be valued differently.  You could also use the hourly spreadsheet to calculate the peak demand offset monthly from PV generation.

Mike Busman


Michael R. Busman, CEM
Lead Project Engineer II

Chevron Energy Solutions
A Division of Chevron U.S.A., Inc.
145 S. State College Blvd.
Brea, CA  92821
Direct  714-671-3561
Fax     714-671-3438
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Mobile 310-387-2083
mbusman at chevron.com<mailto:mbusman at chevron.com>



From: equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org> [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Nick Caton
Sent: Friday, September 28, 2012 3:18 PM
To: Karen Smith
Cc: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: Re: [Equest-users] On site renewable energy NC v2.2

Hi Karen,

I think the basic procedure is you use your EAc1 energy model's final cost and consumption figures to work out the averaged "rate" for electricity (LEED-2009 EAp2 templates assemble this algebra towards the end, can't recall if the 2.2 templates do the same), and that figure is used to work out the value of the savings accounted under EAc2.  I would start with the EAc2 template and documentation so far as the overall procedure is concerned.

That said, from my (limited) experience and the input of others on this list, PV can be explicitly modeled within eQuest model but is probably most easily approached if you start with some outside task-specific software to determine the amount of power you expect to be generated.  This gives you something to calibrate against without earning a PhD in photovoltaic minutiae.   Kinda similar to geothermal well fields in that regard.  I think the RETscreen spreadsheets are among of the series of tools that have been suggested to this end (more in the archives).

That said as well, to get started back in your model:  Navigate in detailed mode to utility+economics tab --> component tree --> right click "Project" at the top --> Create Photovoltaic Module...
Your help documentation starts here (and probably ends up in the onebuilding archives):  Volume 2: Dictionary > HVAC Components > PV-MODULE

Best regards,

~Nick

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NICK CATON, P.E.
SENIOR ENGINEER

Smith & Boucher Engineers
25501 west valley parkway, suite 200
olathe, ks 66061
direct 913.344.0036
fax 913.345.0617
www.smithboucher.com

From: equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org> [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Karen Smith
Sent: Thursday, September 27, 2012 4:31 PM
Subject: [Equest-users] On site renewable energy NC v2.2

Hi,

Does anybdy know how can you add PV energy to energy model ?... as base utility? I'm looking into credits NC-v2.2 EAc2 Onsite Renewable energy and they want the percentage based on the energy model rate and annual energy cost. How should I model it?

Regards,

Karen Smith
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