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HPWH Performance Report 3. Field Testing Results Summary Installation of the twelve field test units began in October of 2016. For all sites except Vancouver Island Site 1 and Vancouver Island Site 4 we have over a year of performance data.10 On average colder temperatures were experienced at the Sanden sites compared to the Rheem sites (see Tables 2 & 3, Average Ambient Temp). This can be accounted for primarily due to the installation of three of the Sanden units in the colder climate of Rossland. The Sanden units achieved a higher average annual coefficient of performance11 “aCOP” (2.69) than the Rheem units (1.79). Table 4 summarizes the effective performance and independent variables of the Sanden units and Table 5 summarizes the performance of the Rheem units separating the Kelowna Site 3 results as it is an unducted unit in a conditioned space. Table 6 and Table 7 show the respective technologies’ performance in IP units. Table 4: Sanden Performance (SI units) Site aCOP Tank Size (Litres) Climate Zone HDD Below 18°C Average Ambie nt Temp(°C) Average WaterFlow (L/Day) Average Hot Water Temp(°C) Average Inlet Water Temp(°C) Months of Data Rossland Site 1 2.62 314 6 4,600 2.6 102 52.9 11.0 15 Rossland Site 2 3.15 314 6 4,600 3.2 120 59.4 10.5 15 Rossland Site 3 2.06 314 6 4,600 6.6 100 52.5 10.7 15 Kelowna Site 1 1.86 163 5 3,400 6.6 74 52.4 16.5 15 Kelowna Site 2 3.62 163 5 3,400 8.0 288 51.6 10.2 15 V. Island Site 2 1.98 163 4 2,700 12.2 122 61.9 17.5 12 V. Island Site 3 3.52 163 4 2,700 10.8 148 61.3 15.8 12 Average 2.69 228 5.1 3,911 7.2 136 56.0 13.2 14 Table 5: Rheem Performance (SI units) 12,13 Site aCOP Tank Size (Litres) Climate Zone HDD Below 18°C Average Ambie nt Temp(°C) Average WaterFlow (L/Day) Average Hot Water Temp(°C) Average Inlet Water Temp(°C) Months of Data Kelowna Site 4 1.62 303 5 3,400 9.8 324 50.8 14.4 8 V. Island Site 1 1.76 246 4 2,700 9.5 195 49.4 10.3 4 V. Island Site 4 1.73 246 4 2,700 16.2 65 48.3 16.0 11 V. Island Site 5 2.06 246 4 2,700 16.7 279 49.7 13.5 12 Ave rage 1.79 260 4.3 2,875 13.0 216 49.6 13.6 9 Kelowna Site 3 2.08 303 N/A N/A 20.6 175 51.4 10.5 15 14 10 The lack of performance data for Vancouver Island Site 1 is due to a change of owner at the site. The new owner declined to continue participating in the study. 11 We define aCOP = (total useful energy delivered) / (input energy). This is a measure of efficiency over an annual basis at the respective site and includes tank skins losses. For sites with over a year of data, the performance of the duplicate months is averaged. For the sites with less than a year of data, the performance is extrapolated based on weather regressions and neighboring sites’ weather during the missing periods. 12 Heating Degree Day (HDD) values are from Table C-2 of Division B of the National Building Code of Canada (NBC) and are a measure of the heating demand for a specific location derived from outside air temperature. 13 At Rossland Site 3 the first Sanden unit (GS2) failed on 2/7/17 and was replaced by a newer model (GS3) on 2/16/17. See the Rossland Site 3 section for the cause and details of the failure. 14 Vancouver Island Site 5 is partially conditioned, drawing inlet air from the enclosed but unconditioned garage with the outlet air vented outside. Kelowna Site 3 is an un-ducted unit drawing air from a wood-pellet conditioned space. Kelowna Site 4 has a relatively high water temperature setpoint of 57°C (135°F), and very high water draws, both of which contribute to significant use of the electric elements and lower efficiency than the other Rheem units. 7PDF Image | CO2 Integrated Heat Pump Water Heater
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