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Graphic EXAMPLE (numbers used have no units, and are for example only)
    HCbase                                   K∙A = 4     (chosen for EXAMPLE) PR = ───────────────────────────               HC = K∙A/R      (HEATING COST)     HCalternative + NCalternate               NC = Ra – Rbase     (NEW COST) |
In the columns below, each letter R represents COST of 0.5 units of INSULATION.
Each HC represent 0.5 units of heating COST associated with the total of R above it. |
BASELINE   ALTERNATIVES - - - - - (adding units of INSULATION) - - - - - - - >
R Rb=1     R Ra=1.5   R Ra=2     R Ra=2.5   R Ra=3     R Ra=3.5   R Ra=4 R NC=O.... R ......... R ......... R ......... R ......... R ......... R ...... HC         R NC=0.5   R NC       R NC       R NC       R NC       R NC HC         HC         R NC=1     R NC       R NC       R NC       R NC HC         HC         HC         R NC=1.5   R NC       R NC       R NC HC         HC         HC         HC         R NC=2     R NC       R NC HC         HC         HC         HC         HC         R NC=2.5   R NC HC         HC         HC HC=2     HC HC=1.6   HC         HC         R NC=3 HC         .. HC=2.67                         .. HC=1.33  HC HC=1.14  HC HC HC=4                                                                 HC HC=1                           (PR=1.33)               PR=1.26                 PR=1.29                                                   PR=1.2                                                               PR=1.1 ...PR=1 ...................................................................PR=1 |
EC = ECkwh∙0.007032
EC = ECoil∙0.017/CE EC = ECgas∙0.024/CE |
(ECkwh = COST/KWH
(ECoil   = COST/GAL (ECgas = COST/THERM |
electricity)
fuel oil) natural gas) |
DD=7500
DD=7500 DD=8500 DD=8500 |
EC=(0.06 ECkwh)∙(0.007032)
EC=(0.10 ECkwh)∙(0.007032) EC=(0.06 ECkwh)∙(0.007032) EC=(0.10 ECkwh)∙(0.007032) |
K=
K= K= K= |
79.1
132.9 89.7 149.4 |
Rb
Ra NUIC |
= R-VALUE of BASELINE   structure (B)
= R-VALUE of ALTERNATE structure (A) = (COST(A)/SQ.FT.) - (COST(B)/SQ.FT.) |
WALL DESCRIPTION
|
R-VALUE | NUIC | (CPI) | (PR) |
(1) (2) (3) (4) |
(2x6) 24 inch o.c. 5/8 inch fiberboard sheathing (2x6) 16 inch o.c. 1 inch Glasclad insulated sheathing with Tyvek (2x6) 16 inch o.c. 2 inch Glasclad insulated sheathing with Tyvek Double Stud Wall |
20.0 24.4 28.8 40.0 |
0.31 0.65 1.07 2.97 |
47 29 20   9 |
  1.47   1.64   1.39 |
PERFORMANCE RATIO may be used to MAXIMIZE Performance/Cost Range of ALTERNATIVES ──────> |
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