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HPWH Performance Report 11.2 Kelowna Site 4 (Rheem) Kelowna Site 4 has the lowest performance of all units tested with an aCOP of 1.50. As shown in the Rheem Unit Performance section above, this is due to the site having the highest and peakiest water draw (308 litres per day [81 gallons per day] with a maximum flow of 34.4 litres per minute [9.1 gallons per minute]), and a higher hot water temperature setpoint of 57°C (135°F) than the other Rheem units which are set at 54°C (130°F). With these 3 factors combined, this integrated unit operated with marginal performance improvements over an electric resistance heater during the winter month. In fact, 67% of the total energy used by the unit was with the electric elements. Observed data: 303-L Kelowna Site 4 Rheem [80-gal] 15.4°C Kelowna Site 4 1.62 [59.8°F] 12/16/16 324 LPD [86 GPD] 2/16/18 50.8°C [123°F] 25830 14.4°C [58°F] Site Unit Type Tank Size Beginning Date Ending Date Days of Monitoring Period Site aCOP Average Ambient Air Temp Average Water Flow Average Hot Water Temp (°F) Average Inlet Water Temp (°F) Due to a failed pulse adapter on the water draw flow meter, the Kelowna Site 4 ducted monitoring period does not include data between August and November. We calculate the performance for these months by developing a relationship between COP, daily average air temperature and water draw. Figure 51 shows the monthly performance separating the measured and calculated values. 30 The power meter failed on February 4th, 2017, and multiple subsequent meters failed until it became operational on March 14th. Thus, there is a one-month gap in the data for this site during this period. Additionally, the pulse output adapter for the water flow meter began failing on July 8th, 2017 and the issue was not resolved until November 1st, 2017. 55PDF Image | CO2 Integrated Heat Pump Water Heater
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