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HPWH Performance Report 5. Sanden Unit Performance 5.1 Heat Trace Impact Heat trace is used for freeze protection on the exposed water pipes from the Sanden outdoor unit to the wall of the house. Figure 8 shows the effect of the heat trace power consumption on aCOP and Table 13 shows a summary of the impacts of heat trace across the 7 Sanden sites. On average across the sites the heat trace consumed 21 watts or 14.4% of the total power of the combined heat pump system. The impact of the heat trace on performance is approximately 14.5% (reducing the aCOP to 2.69 from 3.14 on average). The heat trace draw reduces as outside air temperature increases. As such, the impact of the heat trace is generally more significant at the colder weather sites. Figure 8: Heat Trace Effect on Sanden aCOP 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 3.60 3.62 4.23 1.982.11 V. Island Site 2 4.06 3.52 3.23 2.62 3.15 Rossland Site 1 Rossland Site 2 2.56 2.06 Rossland Site 3 2.21 1.86 Kelowna Site 1 Kelowna Site 2 V. Island Site 3 COP with Heat Trace COP w/o Heat Trace Table 13: Summary of Heat Trace Impact Site OnTemp Control? Lengthof Heat Trace (Meters) Average Heat Trace (Watts) Average Heat Trace (Watts/Meter) Heat Trace % of Load aCOP w/o Heat Trace aCOP w/ Heat Trace Rossland Site 1 Yes 3.0 38 12.6 18.7% 3.23 2.62 Rossland Site 2 No 3.4 25 7.6 12.5% 3.60 3.15 Rossland Site 3 No 3.2 20 6.3 19.5% 2.56 2.06 Kelowna Site 1 No 4.6 14 3.0 15.9% 2.21 1.86 Kelowna Site 2 Yes 2.4 25 10.1 14.5% 4.23 3.62 V. Island Site 2 No 1.8 11 5.9 6.3% 2.11 1.98 V. Island Site 3 Yes 2.1 13 6.0 13.4% 4.06 3.52 Average -- 2.94 21 7.4 14.4% 3.14 2.69 7 aCOPPDF Image | CO2 Integrated Heat Pump Water Heater
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