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HPWH Performance Report Figure 6: Weekly COP vs. Outside Air Temperature17 2.3 Impact of Water Draw Patterns on Performance Water draw patterns have slightly different impacts on the performance of the Sanden and Rheem units. Figure 7 shows the relationship between COP and litres per day (LPD) for all sites separated by technology. The Sanden units show a strong positive relationship between COP and water draws. As the average daily water draw goes up for the Sanden units, the COP increases across the board. While OAT also affects the Sanden performance, even the coldest days with high water draws (small blue points above 300 litres per day) have COPs greater than 2.5 and are consistently higher than warm days with low water draw. The Rheem unit performance also increases with higher water draws on warm days, but appears to flatten out or even decrease on colder days, as the units run in electric resistance mode more often. While the performance of both technologies is affected by both 17Temperatures in Figure 6 for all Sanden units and all Rheem units except Kelowna Site 3 are OAT. 3PDF Image | CO2 Integrated Heat Pump Water Heater
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CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
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