[Equest-users] Baseline Modeling as per LEED districtcoolingrequirements

[Heather.Hardie-Hill at CH2M.com]

I just went through a review process for this!

I initially interpreted it the same way the Cam says below however the LEED reviewer disagreed with me and said I should model it as Sam describes below.

I think the catch is this: on page 6 it says " For such projects the secondary equipment within the building is modeled as described in table 3 above (i.e., the same way as in step 1" it also says "The proposed case modeling requirements differ from those in ASHRAE 90.1-2004 Appendix G; however, the baseline case is modeled as instructed in Appendix G."... I think what this means is that the baseline models should be the same in both case 1 and case 2... and everything should be modeled as described in appendix G except the specific type of system as listed in table 3.

if the above sounds confusing feel free to call me.


Heather Hardie-Hill

EIT, LEEDTM AP

Advanced Design and Simulation



CH2M HILL

Industrial & Advanced Technologies

2020 SW Fourth Ave

Portland, OR 97201

ph: (503).872.4509

e: heather.hardie-hill at ch2m.com


-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Cam Fitzgerald
Sent: Thursday, July 08, 2010 9:11 AM
To: Sam Mason; Mohammad Almasri; eQUEST-users at onebuilding.org
Subject: Re: [Equest-users] Baseline Modeling as per LEED districtcoolingrequirements

All:

I hate to disagree with Sam's response, but on page 6 of the USGBC DES document the description of the Model for Step 2 states, "The proposed case modeling requirements differ from those in ASHRAE 90.1-2004 Appendix G; however, the baseline case is modeled as instructed in Appendix G."  So for step 2 the baseline HVAC systems for the residential spaces would be PTHP, not AHU's as required for step 1.

Hope this helps!

Cam S. Fitzgerald, PE, LEED AP

Energy Opportunities, LLC
a 7group company

 -----Original Message-----
From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Sam Mason
Sent: Wednesday, July 07, 2010 9:50 AM
To: Mohammad Almasri; eQUEST-users at onebuilding.org
Subject: Re: [Equest-users] Baseline Modeling as per LEED districtcoolingrequirements

Mohammad,
You will keep the same the same system from step 1 to step 2 - fan coils with hot water boiler - per Table 3 in the DES guidelines. In step 2, you will create a minimally compliant cooling plant based on Appendix G modeling parameters and attach the fan coils to the plant.

Sam
--
Sam Mason
Atelier Ten


-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Mohammad Almasri
Sent: Wednesday, July 07, 2010 8:38 AM
To: eQUEST-users at onebuilding.org
Subject: Re: [Equest-users] Baseline Modeling as per LEED district coolingrequirements

Hi all,

I Am working now on a Residential tower supplied by a district cooling plant . The proposed design completed as per the LEED required treatment of district cooling . and two model performed (one with virtual chillers and the other one with chilled water meter to reflect the chilled water cost).

The problem that I have now is in the baseline.

In step one (modeled as cost neutral), the document say that the system will be based on table 3 instead of ASHRAE appendix G , system 2 (FCU will be use instead of PTHP).

Now for step two , what the system will be ; it should be a PTHP or a  FCU with a chillers ?

Please I need your advice .

Best regards,

Mohammad Al-Masri
Simulation Engineer
CAPM,LEED AP BD+C





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