The parameters in the above equation are listed in Table 250. Table 250: Solar Water Heater Calculation Assumptions Component Unit Values Source EFbase , Energy Factor of baseline electric Fraction See Table 251 3 water heater Default= 0.945 3 (50 gallon) EFee , Year-round average Energy Factor of Fraction EDC Data Gathering EDC proposed solar water heater Data Gathering Default=1.84 (for tanks 1 gallons) ≤55 HW , Hot water used per day in gallons 50 4 Thot , Temperature of hot water 119 5 Tcold , Temperature of cold water supply 55 6 ETDF , Energy to Demand Factor (defined 0.00008047 2 above) F As of 4/16/2015, Federal standards for electric water heater Energy Factors are equal to Storage in Gallons ) for tanks equal to or smaller than 55 gallons. For tanks larger than 55 gallons, the minimum Energy Factor is 2.057 (0.00113*Rated Storage). The following – table shows the baseline Energy Factors for various tank sizes: Table 251: Minimum Baseline Energy Factors Based on Tank Size Tank Size (gallons) Minimum Energy Factors 40 0.948 50 0.945 65 1.984 80 1.967 120 1.921 The partially-deemed algorithm for savings attributable to the installation of a solar water heater is given below. A For most projects, the appropriate evaluation protocol is to verify installation and proper selection of default values. For projects using customer specific data for open variables, the appropriate evaluation protocol is to verify installation and proper application of TRM protocol along with
The parameters in the above equation are listed in Table 250. Table 250: Solar Water Heater Calculation Assumptions Component Unit Values Source EFbase , Energy Factor of baseline electric water heater Fraction See Table 251 3 Default= 0.945 (50 gallon) 3 EFee , Year-round average Energy Factor of proposed solar water heater Fraction EDC Data Gathering EDC Data Gathering Default=1.84 (for tanks ≤55 gallons) 1 HW , Hot water used per day in gallons 50 4 Thot , Temperature of hot water 119 5 Tcold , Temperature of cold water supply 55 6 ETDF , Energy to Demand Factor (defined above) 0.00008047 2 As of 4/16/2015, Federal standards for electric water heater Energy Factors are equal to Storage in Gallons ) for tanks equal to or smaller than 55 gallons. For tanks larger than 55 gallons, the minimum Energy Factor is 2.057 – (0.00113*Rated Storage). The following table shows the baseline Energy Factors for various tank sizes: Table 251: Minimum Baseline Energy Factors Based on Tank Size Tank Size (gallons) Minimum Energy Factors 40 0.948 50 0.945 65 1.984 80 1.967 120 1.921 The partially-deemed algorithm for savings attributable to the installation of a solar water heater is given below. For most projects, the appropriate evaluation protocol is to verify installation and proper selection of default values. For projects using customer specific data for open variables, the appropriate evaluation protocol is to verify installation and proper application of TRM protocol along with F A
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