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HPWH Performance Report 10.3 Rossland Site 3 (Sanden) Observed data: The Rossland Site 3 data is split into two separate periods. On February 7th, 2017, the original unit failed due to condensation issues on the printed control board (PCB). The outdoor unit was replaced with a newer generation (GS3) on February 16th, 2017. We have 94 days of metered data for the old GS2 unit and 363 days for the new GS3 unit. The GS2 unit performed with a COP of 1.94 with an average air temperature of -3.9°C (25°F). The GS3 unit performed with a COP of 2.03 over a period of 363 days with an average ambient temperature of 6.9°C (44°F). The GS3 unit’s performance was negatively impacted by multiple periods totaling over 4-weeks in which the occupant drew no hot water. The unit ran to maintain the hot water temperature setpoint, but no useful work was done resulting in an effective COP of 0 over the interval. Table 24: Rossland Site 3 Summary Site Tank Size Beginning Date Ending Date Days of Monitoring Period Rossland Site 3 GS2 Rossland Site 3 GS3 Combined: 315-L [83-gal] 315-L [83-gal] 11/5/16 2/16/17 2/7/17 2/16/18 94 363 457 9°C [48°F] 11°C [51°F] 11°C [51°F] Table 25: Rossland Site 3 Variables Site aCOP Average Ambient Temp Average Water Flow Average Hot Water Temp Average Inlet Water Temp Rossland Site 3 GS2 Rossland Site 3 GS3 Combined: -3.9°C 1.94 [25°F] 6.9°C 2.03 [44°F] 6.6°C 2.06 [43.9°F] 109 LPD 57°C [29 GPD] [134°F] 97 LPD 52°C [26 GPD] [127°F] 100 LPD 53°C [26 GPD] [127°F] The average annualized COP (aCOP) of the combined data set of Rossland Site 3 is higher than the individual COPs of the GS2 and GS3 units during their respective monitoring periods. This is due to the GS2 having slightly better performance during November, December, and January than the GS3 despite similar ambient temperatures. When the two are combined together the annual performance of the GS3 unit which has nearly 12 months by itself increases from the impact of the GS2 winter performance. This is shown graphically in Figure 30. 32PDF Image | CO2 Integrated Heat Pump Water Heater
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