Trace-users Digest, Vol 16, Issue 1

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Fareed, What are the statements your looking for clarification on? If your project is an NC project, you should do one energy model for the facility. You'll have a baseline case and a proposed design case. Look up some past posts on this forum and CIRs about existing building modeling. I want to say 90.1 allows the baseline to be modeled one of two ways: either as the existing building, or as the 90.1 baseline as defined per the standard. Not sure on this - but a little research should clear it up.

Shariq_Ali at URSCorp.com's picture
Joined: 2011-10-01
Reputation: 200

Shariq,

The only baseline is the 90.1 baseline. G1.2 requires compliance with
sections 5,6,7,8,9, and 10 while applicability criteria in 90.1 section
4.2.1.2 and 4.2.1.3 indicates that additions and alterations to existing
buildings must comply with sections 5,6,7,8,9,and 10 or 11. So through
the commutative property of ASHRAE logic, the Appendix G baseline
applies to existing buildings and only to the actual addition or
alteration that is being considered under 90.1.

Regards,

Stephen

Stephen Smith's picture
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Joined: 2011-10-01
Reputation: 0

Fareed,

You should model your building as one building and prorate the LEED
score card.

The big thing to remember here is that for the existing portion of the
building you are able to compare your design to the existing envelope
(walls, windows, roof, etc) regardless of the scope of work as indicated
in Appendix G. However, for the new portion of your building you will
need to compare the envelope to ASHRAE 90.1 as if it were any other new
construction.

ARTURO HERNANDEZ, Mechanical Engineering

Hernandez, Arturo's picture
Joined: 2011-09-30
Reputation: 0

I think in your original question you were mostly confused of the rating
system this would be your LEED score card based on your %.

Points

New

Old

77%

34%

Pro-rated Points

1

10.5%

3.5%

8.1%

1.2%

9.3%

2

14.0%

7.0%

10.8%

2.4%

13.2%

3

17.5%

10.5%

13.5%

3.6%

17.0%

4

21.0%

14.0%

16.2%

4.8%

20.9%

5

24.5%

17.5%

18.9%

6.0%

24.8%

6

28.0%

21.0%

21.6%

7.1%

28.7%

7

31.5%

24.5%

24.3%

8.3%

32.6%

8

35.0%

28.0%

27.0%

9.5%

36.5%

9

38.5%

31.5%

29.6%

10.7%

40.4%

10

42.0%

35.0%

32.3%

11.9%

44.2%

ARTURO HERNANDEZ, Mechanical Engineering

Hernandez, Arturo's picture
Joined: 2011-09-30
Reputation: 0

Sorry it should be

Points

New

Old

34%

77%

Pro-rated Points

1

10.50%

3.50%

3.57%

2.70%

6.27%

2

14.00%

7.00%

4.76%

5.39%

10.15%

3

17.50%

10.50%

5.95%

8.09%

14.04%

4

21.00%

14.00%

7.14%

10.78%

17.92%

5

24.50%

17.50%

8.33%

13.48%

21.81%

6

28.00%

21.00%

9.52%

16.17%

25.69%

7

31.50%

24.50%

10.71%

18.87%

29.58%

8

35.00%

28.00%

11.90%

21.56%

33.46%

9

38.50%

31.50%

13.09%

24.26%

37.35%

10

42.00%

35.00%

14.28%

26.95%

41.23%

ARTURO HERNANDEZ, Mechanical Engineering

Hernandez, Arturo's picture
Joined: 2011-09-30
Reputation: 0

MIME-Version: 1.0 From: Shariq_Ali at URSCorp.com To: "Stephen Smith" Cc: Date: Mon, 2 Nov 2009 17:15:26 -0500 Message-ID: X-Mailer: Lotus Domino Web Server Release 6.5.6FP1 HF268 March 18, 2009 X-MIMETrack: Serialize by Notes Server on MAIL110A/URSCorp(Release 6.5.6FP1 HF268|March 18, 2009) at 11/02/2009 05:15:26 PM, Serialize complete at 11/02/2009 05:15:27 PM, Itemize by Notes Server on MAIL110A/URSCorp(Release 6.5.6FP1 HF268|March 18, 2009) at 11/02/2009 05:15:27 PM, Serialize by Router on SMTP113/URSCorp(Release 6.5.6FP1 HF231|November 04, 2008) at 11/02/2009 05:12:31 PM, Serialize complete at 11/02/2009 05:12:31 PM Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/html; charset=ISO-8859-1

Stephen,
 
I didn't mean to imply there&= nbsp;is more than one baseline; however there is more than one way to = approach the question that was asked. I've read the requirements of G1.2, a= nd section 4 also. I believe the question wasn't about the "Addition" but a= bout the existing parts of the HVAC system that are to remain "un-touc= hed."
 
The exception to 6.1.1.3 specifically cal= ls out relocation of equipment not applying to the standard, along with a f= ew other cases (which may apply to Fareed's analysis). The 90.1 users guide= sheds a bit more light on the exception than the standard itself. If reloc= ated existing equipment does not apply to the standard, then I don't see wh= y existing equipment that is not relocated would apply.
 
I believe we only disagree in your last statement:


 

"So through the commutative property of A= SHRAE logic, the Appendix G baseline applies to existing buildings = and only to the actual addition or alteration that is being consid= ered under 90.1."
I wouldn't say it applies to the existing b= uilding - per the exception 6.1.1.3.
 
What do yo= u others think? Anyone dealt with this issue previously?

Shariq_Ali at URSCorp.com's picture
Joined: 2011-10-01
Reputation: 200