[Bldg-sim] Roof construction-AppendixG ASHRAE 90.1

Sanjay Cholekar cholekar at yahoo.com
Tue Sep 1 03:40:44 PDT 2009


Hi Sambhav

AppendixG ASHRAE 90.1- 2004: states to model base case ,if roof is present with insulation on above deck only.only need put in a simple U-value for the Specification method . You then create your actual construction in your Proposed case.

This is to avoid "Attic effect" .Insulation on inside of roof creates attic effect.

 Regards, 


Sanjay Cholekar


+919326229841





________________________________
From: surekha tetali <surekhatetali at gmail.com>
To: bldg-sim at lists.onebuilding.org
Sent: Thursday, 28 May, 2009 7:44:36 PM
Subject: Re: [Bldg-sim] Roof construction-AppendixG ASHRAE 90.1

Hi,

As per Table G3.1 of ASHRAE 90.1- 2004:"Opaque assemblies used for new buildings or additions shall conform with the following common,lightweight assembly types and shall match the appropriate assembly maximum U-factors in Tables 5.5-1 through 5.5-8"
As the code mentioned all the constructions to be lightweight assemblies, my guess is, that only insulation is to be modeled. I hope somebody can throw some more light on this.

Regards,

Surekha Tetali




Date: Wed, 27 May 2009 17:38:10 +0530
>From: sambhav tiwari <tiwari.sambhav at gmail.com>
>Subject: [Bldg-sim] Roof construction-AppendixG ASHRAE 90.1
>To: bldg-sim at lists.onebuilding.org
>Message-ID:
>       <586827530905270508n4f931c8brbfbac8d45e9617cb at mail.gmail.com>
>Content-Type: text/plain; charset=ISO-8859-1
>
>Hello All,
>
>I am working on a energy simulation model following Appendix G of
>ASHRAE 90.1-2004.
>In this appendix, table G3.1, under the building envelope category
>specifies that for roofs- insulation is entirely above deck but does
>not specific the kind of construction. Can I use any kind of material
>(like RCC, cast concrete or a metal frame) with insulation above deck
>to meet the required U value. Please clarify.
>
>Thanks & Regards,
>
>Sambhav Tiwari.
>
>
>------------------------------
>
>Message: 4
>Date: Wed, 27 May 2009 06:07:24 -0700 (PDT)
>From: John Aulbach <jra_sac at yahoo.com>
>Subject: Re: [Bldg-sim] Roof construction-AppendixG ASHRAE 90.1
>To: bldg-sim at lists.onebuilding.org, sambhav tiwari
>       <tiwari.sambhav at gmail.com>
>Message-ID: <87913.56583.qm at web52805.mail.re2.yahoo.com>
>Content-Type: text/plain; charset="iso-8859-1"
>
>Sambhav:
>
>My understanding is that you only need put in a simple U-value for the Specification method (see attached Word Document). You then create your actual construction in your Proposed case.
>
>John Aulbach
>
>--- On Wed, 5/27/09, sambhav tiwari <tiwari.sambhav at gmail.com> wrote:
>
>> From: sambhav tiwari <tiwari.sambhav at gmail.com>
>> Subject: [Bldg-sim] Roof construction-AppendixG ASHRAE 90.1
>> To: bldg-sim at lists.onebuilding.org
>> Date: Wednesday, May 27, 2009, 5:08 AM
>> Hello All,
>>
>> I am working on a energy simulation model following
>> Appendix G of
>> ASHRAE 90.1-2004.
>> In this appendix, table G3.1, under the building envelope
>> category
>> specifies that for roofs- insulation is entirely above deck
>> but does
>> not specific the kind of construction. Can I use any kind
>> of material
>> (like RCC, cast concrete or a metal frame) with insulation
>> above deck
>> to meet the required U value. Please clarify.
>>
>> Thanks & Regards,
>>
>> Sambhav Tiwari.
>> _______________________________________________
>> Bldg-sim mailing list
>> http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org
>> To unsubscribe from this mailing list send? a blank
>> message to BLDG-SIM-UNSUBSCRIBE at ONEBUILDING.ORG
>>
>
>
>
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