Table : Low Flow Faucet Aerator Calculation Assumptions Term Unit Value Source GPMbase , Average baseline flow rate of Default =2.2 1 aerator (GPM) Or EDC Data Gathering GPMlow , Average post measure flow rate of Default = 1.5 1 aerator (GPM) Or EDC Data Gathering TPerson-Day , Average time of hot water usage Kitchen=4.5 2 per person per day (minutes) Bathroom=1.6 Unknown=6.1 NPersons , Average number of persons per Default SF=2.4 3 household Default MF=1.9 Default Unknown=2.4 Or EDC Data Gathering Tout , Average mixed water temperature flowing Kitchen=93 4 ˚F from the faucet (ºF) Bathroom=86 Unknown= 87.8 Tin , Average temperature of water entering the 55 5, 6 ˚F house (ºF) RE , Recovery efficiency of electric water heater Decimal 0.98 7 ETDF, Energy To Demand Factor 0.000134 8 , Average number of faucets in the home SF: 9 Kitchen=1.0 Bathroom=3.0 Unknown=4.0 MF: Kitchen=1.0 Bathroom=1.7 Unknown=2.7 Unknown Home Type: Kitchen=1.0 Bathroom=2.8 Unknown=3.8 Or EDC Data Gathering DF , Percentage of water flowing down drain % Kitchen=75% 10 Bathroom=90% Unknown=79.5% ISR , In Service Rate % Variable EDC Data Gathering ELEC , Percentage of homes with electric water % Default: Unknown=43% 11 heat Or EDC Data Gathering: Electric = 100% Fossil Fuel = 0.0% , percentage of daily faucet use during PJM % 19.5% 8 peak period
Table : Low Flow Faucet Aerator Calculation Assumptions Term Unit Value Source GPMbase , Average baseline flow rate of aerator (GPM) Default =2.2 Or EDC Data Gathering 1 GPMlow , Average post measure flow rate of aerator (GPM) Default = 1.5 Or EDC Data Gathering 1 TPerson-Day , Average time of hot water usage per person per day (minutes) Kitchen=4.5 Bathroom=1.6 Unknown=6.1 2 NPersons , Average number of persons per household Default SF=2.4 Default MF=1.9 Default Unknown=2.4 Or EDC Data Gathering 3 Tout , Average mixed water temperature flowing from the faucet (ºF) ˚F Kitchen=93 Bathroom=86 Unknown= 87.8 4 Tin , Average temperature of water entering the house (ºF) ˚F 55 5, 6 RE , Recovery efficiency of electric water heater Decimal 0.98 7 ETDF, Energy To Demand Factor 0.000134 8 , Average number of faucets in the home SF: Kitchen=1.0 Bathroom=3.0 Unknown=4.0 MF: Kitchen=1.0 Bathroom=1.7 Unknown=2.7 Unknown Home Type: Kitchen=1.0 Bathroom=2.8 Unknown=3.8 Or EDC Data Gathering 9 DF , Percentage of water flowing down drain % Kitchen=75% Bathroom=90% Unknown=79.5% 10 ISR , In Service Rate % Variable EDC Data Gathering ELEC , Percentage of homes with electric water heat % Default: Unknown=43% Or EDC Data Gathering: Electric = 100% Fossil Fuel = 0.0% 11 , percentage of daily faucet use during PJM peak period % 19.5% 8
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