[Bldg-sim] Core and Shell Office Modelling

Jaigath Chandraprakash cjaigath at yahoo.com
Thu Apr 7 07:51:23 PDT 2011


Thank you James.

That is my next question. Where to base the fcu efficiency? You said Appendix G 
but the constant volume fans are for dx units, will it be acceptable? Should I 
use system 1&2 formula or system 3&4? 




________________________________
From: James Hansen <JHANSEN at ghtltd.com>
To: Shanta Tucker <shanta.tucker at atelierten.com>; Jaigath Chandraprakash 
<cjaigath at yahoo.com>; bldg-sim at lists.onebuilding.org
Sent: Thu, April 7, 2011 10:31:03 PM
Subject: RE: [Bldg-sim] Core and Shell Office Modelling


To further what Shanta said:  unless you have a legally binding lease agreement 
that lists specific efficiencies of the fan coil units that the tenants must buy 
(or a requirement that the tenants must purchase FCUs that match the basis of 
design on the contract drawings), then I believe the fan power of those FCUs 
must unfortunately match the Appendix G requirements.  In other words, you can’t 
model an ECM motor tenant FCU in your proposed design unless there is some 
enforceable document that requires tenants to purchase them in this arrangement.
 
GHT Limited
James Hansen, PE, LEED AP
Senior Associate
1010 N. Glebe Rd, Suite 200
Arlington, VA  22201-4749
703-338-5754 (Cell)
703-243-1200 (Office)
703-276-1376 (Fax)
www.ghtltd.com
 
 
From:bldg-sim-bounces at lists.onebuilding.org 
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Shanta Tucker
Sent: Thursday, April 07, 2011 10:19 AM
To: Jaigath Chandraprakash; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Core and Shell Office Modelling
 
Hello Jaigath,
My suggested answers follow your questions.
 
1. Does that mean I will be modeling only the common since it only the areas 
that were designed? No. You must model the whole building and site.
2. Do I need to also include the tenant areas? Yes, include the tenant spaces.
3. Since the tenant areas have FCU pipe provision, do I model it as FCU or do I 
have to model it as system 6 which is my baseline case? You may model the tenant 
spaces with FCU’s in the proposed model so long as you have an engineering 
drawing for a typical floor showing this; if you don’t have this I suggest that 
you ask for it. If that is not possible to obtain, perhaps a narrative from the 
engineer of record or the tenant lease would suffice, but I’m not 100% sure if 
it would. In my opinion,  you’ll need to provide some documentation that the 
tenants must install the FCU’s in order to help the GBCI reviewers understand 
the argument why you are modeling FCU’s and not system 6.  

 
--
Shanta Tucker
Atelier Ten
 
 
From:bldg-sim-bounces at lists.onebuilding.org 
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Jaigath 
Chandraprakash
Sent: Thursday, April 07, 2011 7:21 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Core and Shell Office Modelling
 
 
I am simulating a core and shell office building with system 6 for my baseline. 
The design case is a two pipe fan coil units at common areas and all tenants 
will have chilled water pipe provision for them to tap their fan coil units. 
Based in CS Appendix 6 under step 1, model the HVAC system as described in the 
design documents. My question is:
1. Does that mean I will be modeling only the common since it only the areas 
that were designed?
2. Do I need to also include the tenant areas?
3. Since the tenant areas have FCU pipe provision, do I model it as FCU or do I 
have to model it as system 6 which is my baseline case?
 
Thank you all in advance.
 
 
Jaigath

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