Re: [EnergyPlus_Support] ASHRAE 90.1 Baseline Building

Hi Sean,

Bang on for the baseline.

1) make sure to define spaces beforehand as non-res, res and semi-heated

2) mark all semi-exterior surfaces and make sure you understand the difference between semi-heated and semi-exterior

3) slab-on-grade has a very narrow definition...check it (eg. basement slab is not slab on grade)

4) anything not regulated uses the same as the proposed case (eg. basement slab)

Design:

Honestly, I don't know. I interperate it as such that where your contruction varies from the types in the standard, you must make absolute certain that you calculate in the thermal breaks using either the standard or other methods accepted by the standard such as those in ASHRAE HOF.

In the past I had not paid close attention and my u-values simply matched those I had in the structural report (which won't be far off, possibly even more exact)...but those were made according to EU norms. Thermal breaks were included, but simply assumed at 10% (probably completely overestimated).

LEED reviews have not flagged this in the past, but that doesn't mean it is correct. And just like me, the reviewers are also getting smarter.

Tip: ASHRAE based questions are better and often more expertly answered on LEEDuser EAp2 forum.

On 08.10.2013, at 23:08, <seanking.1970@xxxxxxxxxxx> wrote:

Thanks, Jean.

Sorry, but my original post was sent in hurry.

Here I want to reassure that:

Baseline building envelope uses ONLY:
Roof - Insulation Entirely above Deck (1 of 3);
Above-Grade Wall - Steel-Framed (1 of 4);
Floor - Steel-Joisted (1 of 3)
Opaque door types shall match the proposed design and conform to the U-factor requirements from the same tables.
Slab-on-grade floors shall match the F-factor for unheated slabs from the same tables.
Opaque assemblies used for alterations shall conform with Section 5.1.3.
Proposed building can use ANY:
3 roof types;
4 wall types;
1 below-grade wall;
3 floor types;
2 slab-on-grade floor types
2 opaque door types
shown in Tables 5.5-1 through 5.5-8, with typical detailed constructions listed in appendix A (or recommend proposed building using these constructions even though the use of constructions for proposed design can be arbitrary, as the Standard states "All components of the building envelope in the proposed design shall be modeled as shown on architectural drawings or as built for existing building envelopes.").

Please confirm above understanding is right. If not, please correct with comments. Thank you very much indeed.

Sean

---In EnergyPlus_Support@xxxxxxxxxxxxxxx, <energyplus_support@xxxxxxxxxxxxxxx> wrote:

Yip. Also note the reflectivity for the roof must be 0.3 (unless you have an SRI better than somthing very high...I don't remember).

Mit freundlichen GrÃ¼Ã?en- Sent from my iPhone (excuse the brevity)

i. A.
Jean Marais
b.i.g. bechtold
Tel. +49 30 6706662-23

On 08.10.2013, at 18:02, <seanking.1970@...> wrote:

Dear all,

In Standard 90.1-2007 SI edition, Page 178, Table G3.1 No.5 Building Envelope section:

Can I understand for baseline building we only need to use roof - insulation entirely above deck, above-grade wall - steel-framed, floor - steel-joisted etc. Other constructions in Appendix A just for the purpose of using for proposed building?

Thanks and regards,

Sean

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