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HPWH Performance Report Table 9: Rheem Energy Savings Summary Kelowna Site 3 2.08 8 [27] 3,333 1,387 1,947 58% 15 2.2 Impact of Outside Air Temperature on Performance Both the Sanden and Rheem units show a positive correlation between performance (COP) and outside air temperature (OAT). However, as seen in Figure 6, the Sanden units perform with higher COPs at nearly every temperature. In fact, the only weeks a Sanden site performed near or below a Rheem site at a similar temperature, were weeks with very low water draws (less than 50 litres per day). More discussion on the impacts of water draw patterns is found in Section 2.3 below. The data shows a tighter correlation for the Rheem performance (tighter spread in COP) with OAT than in the Sanden units. The Rheem units operate in electric resistance mode more often than in heat pump mode at lower OATs. The manufacturer specifications for the Rheem unit states the heat pump can operate at temperatures as low as 2.8°C (37°F). Consequently, all weeks the average air temperature was below 2.8°C, the Rheem units performed with a COP of 1.0 or below, performing much like a standard electric resistance water heater. There is also a strong, yet variable relationship between COP and OAT in the Sanden units (wider range of COP). This greater variability is primarily due to water draw patterns that more strongly affects the performance of the Sanden units compared to the Rheem units. Sanden states that its heat pump units operate effectively at temperatures as low as -29°C (-20°F), which is why we see COPs as high as 2.0 during some weeks with average OATs lower than -10°C (14°F). This differs from Rheem’s heat pump cut-off temperature of 3°C (37°F) Site aCOP Average Water Heating Load Delivered (kWh/day) [kBtu/day] Annual Base line Ene rgy (kWh) Annual Rheem Ene rgy (kWh) Annual Ene rgy Savings (kWh) % Savings Months of Data Kelowna Site 4 1.62 16 [53] 6,557 3,494 3,064 47% 8 V. Island Site 1 1.76 12 [39] 4,749 2,382 2,367 50% 4 V. Island Site 4 1.73 2 [8] 1,019 522 497 49% 11 V. Island Site 5 2.06 12 [40] 4,884 2,093 2,791 57% 12 Average 1.79 10 [35] 4,302 2,123 2,180 51% 9 2PDF Image | CO2 Integrated Heat Pump Water Heater
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