[Bldg-sim] Minimum Requirement of Thermal Performance of Proposed Building Envelope

[via Bldg-sim]

More broadly speaking:  The opening passages to Appendix G are clear in stating Appendix G is NOT a path to demonstrate compliance with the standard.  If you or your reviewer are interpreting the performance rating method as a way of demonstrating compliance, there is a disconnect to resolve.

 

The comment you received however might be “correct” if besides demonstrating the buildings performance rating, you must also demonstrate prescriptive compliance with 90.1.  

 

I’d advise answering conclusively whether prescriptive compliance documentation for 90.1 is something you’re supposed to be delivering, or not.  If so, I’d point you next towards COMcheck to efficiently evaluate the envelope trade-off alternative to meeting all of the minimums in the tables.

 

~Nick

 

Nick Caton, P.E.

  Senior Energy Engineer
  Energy and Sustainability Services
  Schneider Electric

D  913.564.6361 
M  785.410.3317 
E  nicholas.caton at schneider-electric.com <mailto:nicholas.caton at schneider-electric.com> 
F  913.564.6380

15200 Santa Fe Trail Drive
Suite 204
Lenexa, KS 66219
United States

 

 

 

From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Francesco Passerini via Bldg-sim
Sent: Thursday, September 08, 2016 4:00 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Minimum Requirement of Thermal Performance of Proposed Building Envelope

 

The U-values are not mandatory for the designed building. The U-value limits must be respected by the baseline model. The mandatory provisions for the designed building are in paragraph 5.4 as for the envelope (in par. 6.4 as for the HVAC system, in par. 7.4 as for the Service Hot Water, and so on).

Best Regards

Francesco Passerini


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From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Sherif Farag via Bldg-sim
Sent: Wednesday, September 07, 2016 10:54 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Minimum Requirement of Thermal Performance of ProposedBuilding Envelope

 

Dears;

It is my understanding that App G doesn't mandate the criteria of baseline building envelope' thermal performance as described on tables 5.5-1 through 5.5-8 to be implemented on the proposed building as well, it is the design team in collaboration with the energy modeller who shall decide about the adequate U-Factor of different building fabric element even if the U-factor's of some elements exceed the respective values of baseline building as far as the overall building performance achieved the required target, I don't think this is right interoperation of G1.2, please correct me if I am wrong.

 

I have received the following comment from the rating authority "Please revise the above grade U-value to be equal to or less than the ASHRAE 90.1 baseline value"; for me, the comment doesn't correlate with the App. G.

 

Please let me know your thoughts;

 

Thanks;

 

Sherif Farag

Sustainability Consultant

P.O. Box: 127842

Abu Dhabi, UAE

M: +971 55 199 0022 | E: sherif.sabr at gmail.com | Skype ID: sherif.farag9


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