The WER Index can be used for single family dwellings or multiple dwelling units. This is adjusted through the number of dwelling units, Ndu.
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1 1.0 Calculating Water Efficiency Rating Index. A Water Efficiency Rating Index (or WER Index) shall be calculated as iiiiiiiiiiii aaaaaa oooooooooooooo gggggg ffffff tthee rrrrrrrrrr hoooooo = iiiiiiiiiiii aaaaaa oooooooooooooo gggggg ffffff tthee rrrrrrrrrrrrrrrrrr hoooooo 100 Indoor and outdoor gpd values for the reference and rated home shall be determined in accordance with sections 3 and 4. The WER Index can be used for single family dwellings or multiple dwelling units. This is adjusted through the number of dwelling units, Ndu. 2.0 Determining the Indoor Reference Home GPD. The indoor reference home shall be calculated as rrrrff iiii gggggg = rrrrrrrrrrrrrr + rrrrrrrrrrrrrr + rrrrrrddwwwwwwww + rrrrrrrrrrrrrrrr + rrrrrrrrrrrrrr + rrrrrrrrrrrrrrrrrr + tttttttttttttttt reffgpd= daily fixture water use for the reference home refwgpd= daily fixture water waste for the reference home refdwgpd= daily dishwasher use for the reference home refcwgpd= daily clothes washer use for the reference home reftgpd= daily toilet for the reference home refsofgpd= daily water softener use for the reference home totleaks= total leaks 2.1 Determining Reference Fixture Water Use. Reference fixture water use shall be calculated as rrrrrrrrrrrrrr = NNNNNN Nbr= number of bedrooms in the rated home 2.3 Determining Reference Fixture Water Waste. Reference fixture water waste shall be calculated as Nbr= number of bedrooms rrrrrrrrrrrrrr = 9.8 NNNNNN 0.43
2 2.4 Determining Reference Dish Washer Water Use. Reference dish washer water use shall be calculated as ( XX NNNNNN) 8.16 refdwgpd = 365 Nbr= number of bedrooms 2.5 Determining Reference Clothes Washer Water Use. Reference clothes washer water use shall be calculated as rrrrrrrrrrrrrrrr = 4.52 XX ( NNNNNN) ( ) ( ) 365 Nbr= number of bedrooms 2.6 Determining Reference Toilet Water Use. Reference toilet water use shall be calculated as rrrrrrrrrrrrrr = rrrrrrrrrrrr rrrrrrrrrrrr OOOOOO reffpo= the reference flushes per person per day = 5.05 refgpf= the reference gallons per flush for toilets = 1.6 Occ= the number of occupants = * Nbr Nbr= number of bedrooms 2.7 Determining Reference Water Softener Use. Reference water softener water use shall be calculated as if tthee rrrrrrrrrr hoooooo haaaa aa wwwwwwwwww ssssssssssssssss and wwwwwwwwww haaaaaaaaaaaaaa aaaa tthee rrrrrrrrrr hoooooo llllllllllllllll iiii 180 mmmmmmmmmmmmmmmmmm llllllllll then gggggggggggg oooo haaaaaaaaaaaaaa refsofgpd = ssssss oooo iiiiiiiiiiii wwwwwwwwww uuuuuuuu iiii tthee rrrrrrrrrrrrrrrrrr hoooooo gggggggggggg oooo wwwwwwwwww 5 gggggggggggggg uuuuuuuu 1,000 gggggggggggg rrrrrrrrrrrrrr
3 Otherwise refsofgpd = Determining total leaks. Total leaks shall be determined as tttttttttttttttt = 5.93 NNNNNN Nbr= the number of bedrooms in the rated home 3.0 Determining the Outdoor Reference Home GPD. The reference home outdoor GPD shall be calculated as using the following two equations Equation 1: Equation 2: eeeeee(aa) eeeeee(aa) [ nnnnnnnnnn IIIIIIIIIIIIII iiiiii_pppppppp nnnnnnnnnn] exp(b) [ netet IrrArea] 1 + exp(b) IF the rated home has an automatic irrigation system AND Rat_Irr_Area < Ref_Irr_Area THEN Ref_Out= eeeeeeeeeeeeeeee 1 eeeeeeeeeeeeeeee 1 (wwwwwwh IIIIII_AAAAAAAA=Rat_Irr_Areaaaaaaa bbbbbbh iiiiiiiiiiiiiiiiiiss=0) eeeeeeeeeeeeeeee 1 (wwwwwwh IIIIII_AAAAAAAA=RRRRRR_IIIIII_AAAAAAAA aaaaaa bbbbbbh iiiiiiiiiiiiiiiiiiii=0) IF the rated home has an automatic irrigation system AND Rat_Irr_Area Ref_Irr_Area THEN Ref_Out= equation 1 IF the rated home does not have an automatic irrigation system THEN Ref_Out= equation 2 Exp(A)= X IrrArea Exp(B)= X netet X IrrArea IrrArea= The size of the landscape that will receive supplemental water
4 Ref_Irr_Area= The size of the irrigated area in the reference home, calculate in accordance with section 3.1 Rat_Irr_Area= The size of the irrigated area in the rated home netet= The annual historic sum of mean reference evapotranspiration minus the mean precipitation for all months that evapotranspiration exceeds precipitation ind_pool= Indicator representing the presence or absence of a swimming pool in the rated home 3.1 Reference Irrigated Area. Reference irrigated area shall be calculated as If the lot size of the rated home is < 7,000 ft 2 then RRRRff IIIIrrAAAAAAAA = llllll_aaaaaaaa If The lot size of the rated home is 7,000 ft 2 Then Ref_Irr_Area = lot_area * Ref_Irr_Area= The size of the landscape that receives supplemental water in the reference home Lot_Area= The size of the lot on which the rated home is being constructed 4.0 Determining Indoor Rated Home GPD. The rated home s indoor GPD shall be calculated as IIIIIIIIIIrr gggggg = SShoooooorr gggggg + KKKKKKcchFF gggggg + LLLLLLFF gggggg + WWWWWWWWee gggggg + CCWW gggggg + DDWW gggggg + TTTTTTTTTTTTss gggggg + SSSSSStt gggggg + LLLLLLLLss gggggg Shower gpd = daily shower water use for the rated home KitchF gpd = daily kitchen faucet use for the rated home LavF gpd = daily lavatory water use for the rated home Waste gpd = daily fixture water waste for the rated home CW gpd = daily clothes washer water use for the rated home DW gpd = daily dishwasher water use for the rated home Toilets gpd = daily toilet water use for the rated home Soft gpd = daily water softener water use for the rated home Leaks gpd = daily water leaks for the rated home 4.1 Determining Rated Shower Water Use. Rated home shower water use shall be determined as SShoooooorr gggggg = FFFFFFFFFFFFFFFFFFFF XX sshoooooorr pppp SSSSSSSSSS
5 FixtureTot= Determined in accordance with ANSI/RESNET/ICC Addendum A-2015 Domestic Hot Water Systems = aaaaaaaaaaaaaa FFFFFFFF rrrrrrrrrrrrrr VVVVVVVVVVVVVVVV Shower_pc= Percent of fixture water use consumed by showers = 54% SHeff= the ratio of the average rated flow rate of showerheads to the reference home flow rate = aaaaaaaaaaaaaa ffffffff rrrrrrrr oooo sshooooooooheeeeeeee iiii tthee rrrrrrrrrr hoooooo 2.5 This value is derived from ANSI/RESNET/ICC Addendum A-2015 Domestic Hot Water Systems. 4.2 Determining Kitchen Faucet gpd for the rated home. Kitchen faucet gpd shall be determined as LavF gpd = FFFFFFFFFFFFFFFFFFFF ffffffffffff pppp KKKKKKKKhFFFFFFFF XX kkkkkkkkh FixtureTot= Determined in accordance with ANSI/RESNET/ICC Addendum A-2015 Domestic Hot Water Systems = aaaaaaaaaaaaaa rrrrrrrrrrrrrr VVVVVVVVVVVVVVVV FFFFFFFF faucet pc= Percent of fixture water use consumed by faucets = 46% KitchFeff= the ratio of the average rated flow rate of kitchen faucets to the reference home flow rate = aaaaaaaaaaaaaa ffffffff rrrrrrrr oooo kkkkkkkkheeee ffffffffffffff iiii tthee rrrrrrrrrr hoooooo 2.2 Kitch= the percentage of faucet use that is attributed to kitchen faucets= 69% This value is derived from ANSI/RESNET/ICC Addendum A-2015 Domestic Hot Water Systems. 4.3 Determining Lavatory Faucet gpd for the rated home. Lavatory faucet use shall be determined as LavF gpd = FFFFFFFFFFFFFFFFFFFF ffffffffffff pppp KKKKKKKKhFFFFFFFF LLLLLL Lav= the percentage of faucet use that is attributed to lavatory faucets= 31% FixtureTot= Determined in accordance with ANSI/RESNET/ICC Addendum A-2015 Domestic Hot Water Systems = aaaaaaaaaaaaaa rrrrrrrrrrrrrr FFmmmmmm faucet_pc= Percent of fixture water use consumed by faucets = 46% LavFeff= the ratio of the average rated flow rate of lavatory faucets to the reference home flow rate = 1 for standard faucets and 0.95 for high efficiency faucets This value is derived from ANSI/RESNET/ICC Addendum A-2015 Domestic Hot Water Systems.
6 4.4 Determining Daily Fixture Water Wasted gpd in the Rated Home. Fixture water wasted gpd in the rated home shall be determined as Waste gpd = FF eeeeee (oooooooooo + ssssssssss XX WWWWWWWWWW) FeffX= Fixture efficiency of showerheads, kitchen faucets, and lavatory faucets weighted by contribution to total fixture use (by volume) owgpd= daily standard operating condition waste hot water quantity as determined by ANSI/RESNET/ICC Addendum A-2015 Domestic Hot Water Systems swgpd = daily structural waste hot water quantity as determined by ANSI/RESNET/ICC Addendum A-2015 Domestic Hot Water Systems WDeff= distribution system water use effectiveness from Table (3) of ANSI/RESNET/ICC Addendum A-2015 Domestic Hot Water Systems 4.5 Determining clothes washer gpd in the rated home. Clothes washer gpd in the rated home shall be determined as CW gpd = CCCCCCCC XX CCCCCCCC XX AAAAAA/365 CAPw= washer capacity in cubic feet = the manufacturer s data or the CEC database or the EPA Energy Star website or the default value of ft CWwf= clothes washer water factor= manufacturer s data ACY= Adjusted cycles per year determined in accordance with ANSI/RESNET/ICC Addendum A-2015 Domestic Hot Water Systems 4.6 Determining dish washer gpd in the rated home. Clothes washer gpd in the rated home shall be determined as XX DDWW gggggg = (( XX NNNNNN) dddddddddd DDDD_EEEE 365 Nbr= number of bedrooms in the rated home dwcap= capacity of the dishwasher in the rated home (in cubic feet) as included in the manufacturer s data DW_EF= The energy factor of the dishwasher installed in the rated home
7 4.7 Determining Toilet gpd in the rated home. Toilet gpd in the rated home shall be determined as TTTTTTTTTTtt gggggg = rrrrrrrrrrrr gggggg OOOO reffpo= the reference flushes per person per day = 5.05 gpf= the average gallons per flush of all toilets installed in the rated home Occ= the number of predicted occupants in the rated home= *Nbr Nbr= the number of bedrooms in the rated home 4.8 Determining Water Softener gpd in the rated home. Water softener gpd in the rated home shall be determined as gggggggggggg oooo haaaaaaaaaaaaaa SSSSSStt gggggg = ssssss oooo iiiiiiiiiiii wwwwwwwwww uuuuuuuu iiii tthee rrrrrrrrrr hoooooo gggggggggggg oooo wwwwwwwwww gggggggggggggg uuuuuuuu pppppp 1,000 gggggggggggg oooo haaaaaaaaaaaaaa rrrrrrrrrrrrrr 4.9 Determining Leaks gpd in the rated home. Leaks gpd in the rated home shall be determined as LLLLLLLLss gggggg = TTTTTTTTTTTTTTss bbbb NNNN TotLeaks_br= the average value (in gpd) of leaks per bedroom= 5.93 gpd Nbr= the number of bedrooms in the rated home 5.0 Determining Outdoor Rated Home GPD. The reference home outdoor GPD shall be calculated as If the rated home has an automatic irrigation system eeeeee(aa) eeeeee(aa) [ XX nnnnnnnnnn IIIIIIIIIIIIII XX iiiidd PPPPPPPP nnnnnnnnnn] If the rated home does not have an automatic irrigation system exp(b) [ netet X Irr_Area] 1 + exp(b) Exp(A)= * IrrArea
8 Exp(B)= * netet * IrrArea Irr_Area= The size of the landscape that might receive supplemental water in the rated home netet= The annual historic sum of mean reference evapotranspiration minus the mean precipitation for all months that evapotranspiration exceeds precipitation ind_pool= Indicator representing the presence or absence of a swimming pool 5.1 Smart Controllers. Sensor and weather based irrigation controllers shall decrease the portion of predicted rated home outdoor water use associated with irrigation (less the water use associated with pools) by 15% in homes that have automatic irrigation 5.2 Residential Irrigation Capacity Index (RICI). In rated homes where documentation is provided, a RICI may be calculated as RRRRRRRR_rrrrrr = ssssss oooo ffffffff (gggggg) oooo aaaaaa iiiiiiiiiiiiiiiiiiii vvvvvvvvvvvv fftt 2 iiiiiiiiiiiiiiiiii aaaaaaaa XX 1, Applying RICI. A rated home where documentation for a RICI is provided may adjust the portion of water use associated with irrigation (less the water use associated with pools) in the rated home s outdoor gpd by 10% for every point from a baseline RICI (RICI_ref) of 5.
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