[Equest-users] Baseline Modeling as per LEEDdistrictcoolingrequirements

[Sam Mason]

Thanks for the response with a real project outcome.  The sentence
Heather highlights below is my reasoning for keeping fan coils in both
cases.

 

Hopefully the new DES guidelines will provide a more clear path for this
type of modeling (Through the grapevine it is drafted and awaiting
release).

 

Sam

 

--

Sam Mason

Atelier Ten

 

From: Heather.Hardie-Hill at CH2M.com [mailto:Heather.Hardie-Hill at CH2M.com]

Sent: Friday, July 09, 2010 6:39 PM
To: cam at energyopportunities.com; Sam Mason; malmasri at ems-int.com;
eQUEST-users at onebuilding.org
Subject: RE: [Equest-users] Baseline Modeling as per
LEEDdistrictcoolingrequirements

 

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
<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
<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
<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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