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HPWH Performance Report 2.1 Energy Savings Summary We calculate the average energy savings of the Sanden units to be 67%16 and the Rheem units to be 51% relative to the calculated baseline. The baseline energy is calculated using a standard electric resistance water heater with an energy factor (EF) between 0.86 and 0.91, depending on the size of the tank per the U.S. Department of Energy Federal Standards. We apply this EF to the delivered hot water load measured during the performance period. See Section 8.3 for more details on the baseline energy factors used. On an annual savings basis, both units perform similarly with the Sanden units saving 1,923 kWh per year (relative to the calculated baseline) and the Rheem units saving 2,180 kWh per year on average. However, the Sanden sites saved more energy on a percentage basis than the Rheem units (67% savings at Sanden sites versus 51% at Rheem sites). This difference in kWh savings and percentage savings is due mainly to the Rheem sites having a higher hot water demand of 10 kWh per day delivered hot water (216 litres per day) than the 7 kWh per day (136 litres per day) at the Sanden sites. Data collection periods varied between 4 and 15 months in length. For the sites with less than 12 months of data we calculated the aCOP by developing relationships between performance and ambient temperature and daily water usage, and extrapolating based on neighboring sites’ temperature data and the individual sites’ water draw patterns. For the sites with more than 12 months of data, we averaged the performance and water heating load of the duplicate months in order to annualize the energy savings results. Table 8 summarizes the calculated energy savings of the Sanden units and Table 9 summaries the energy savings of the Rheem units. Table 8: Sanden Energy Savings Site aCOP Average Water Heating Load Delivered (kWh/day) [kBtu/day] Annual Base line Ene rgy (kWh) Annual Sande n Ene rgy (kWh) Annual Ene rgy Savings (kWh) % Savings Months of Data Rossland Site 1 2.62 6 [19] 2,406 790 1,617 67% 15 Rossland Site 2 3.15 7 [24] 2,928 799 2,129 73% 15 Rossland Site 3 2.06 5 [16] 1,967 821 1,145 58% 15 Kelowna Site 1 1.86 3 [12] 1,360 668 692 51% 15 Kelowna Site 2 3.62 14 [47] 5,494 1,388 4,106 75% 15 V. Island Site 2 1.98 7 [22] 2,624 1,212 1,412 54% 12 V. Island Site 3 3.52 8 [27] 3,191 829 2,362 74% 12 Average 2.69 7 [24] 2,853 929 1,923 67% 14 16 Assuming a typical EF of 0.88 for an electric hot water tank the Sanden savings are equal to 1 – 0.88/2.69 = 0.67 or 67% and the Rheem savings are equal to 1 – 0.88/1.79 = 0.51 or 51%. See Section 8.3 for more details on the baseline energy factors used. 1PDF Image | CO2 Integrated Heat Pump Water Heater
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