[Bldg-sim] LEED v3 CS ACP calculator penalizing existing buildings?

[James Hansen via Bldg-sim]

Sorry to post a LEED-related question, but I thought someone might have run into this in the past for EAp2 modeling using the developer control alternative compliance path calculator.



I posted this same question on LEEDUSER but thought I'd get more responses from the modeling community here!





I've done a number of Core and Shell models before, and always use the ACP calculator.  However, something that I've noticed before but never understood is why the Revised Point threshold column is a single column and NOT separate revised thresholds for New and Existing.  As an example:  In a current project, I have a developer control percentage of 47%.  It says that any savings over 13.8% gets you 6 pts (see chart below).  This is a nice drop from the 18% required for a non-ACP path to get 6 pts for new construction projects.  However, the non-ACP path for 6pts requires a renovation project to have 14%.  In other words, the ACP only lowers the 6 pt threshold from 14% to 13.8% for renovations.  Why does this happen?  Is it just something you have to live with for renovations?  Or is there a way you can pro-rate this to be valid for existing building renovations?  Thanks!


Enter the Percent of Energy Cost Influenced or Directly Controlled by CS Owner/Developer:



47.0%









Standard Compliance Path
Savings as a Percent of Core & Shell Building Load

Alternative Compliance Path - Revised Point thresholds based on Percent of Energy Cost influenced by Developer and Percent New Construction versus Major Renovation

Points

New

Renovation

Prereq

10.0%

5.0%

6.3%

3

12.0%

8.0%

10.0%

4

14.0%

10.0%

11.3%

5

16.0%

12.0%

12.5%

6

18.0%

14.0%

13.8%

7

20.0%

16.0%

15.0%

8

22.0%

18.0%

16.3%

9

24.0%

20.0%

17.5%

10

26.0%

22.0%

18.8%

11

28.0%

24.0%

20.1%

12

30.0%

26.0%

21.3%

13

32.0%

28.0%

22.6%

14

34.0%

30.0%

23.8%

15

36.0%

32.0%

25.1%

16

38.0%

34.0%

26.3%

17

40.0%

36.0%

27.6%

18

42.0%

38.0%

28.8%

19

44.0%

40.0%

30.1%

20

46.0%

42.0%

31.3%

21

48.0%

44.0%

32.6%






GHT Limited
James Hansen, PE, LEED AP, BEMP
Principal
1110 N. Glebe Road, Suite 300
Arlington, VA 22201
703.338.5754 (direct/cell)





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