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HPWH Performance Report Unlike the other Rheem sites, Kelowna Site 3 is un-ducted and uses wood-pellet conditioned space air as the heat source. This is clear in Figure 49 as the inlet temperature is consistently higher than the cold-water temperature. Over this 3-day period from January 2nd to January 5th the electrical element only comes on twice during the same evening after a series of high water draws. Consequently, the average COP over this 3-day period is 2.0 which is quite high relative to the other Rheem units during January. However, it is important to note that this heat was drawn from a space that was being heated by wood pellets. We can calculate the upper limit of this parasitic load on the wood pellet stove by calculating the amount of heat removed from the space. Over a 12-month period we estimate 3,394 kWh (11,580 kBtu) or 226 kWh/day (771 kBtu/day) were pumped out of the space to heat water. Assuming a $16/GJ28 cost of wood pellets, this is approximately $195/year ($0.54/day).29 This calculation is only for illustration as we did not actually measure the parasitic load on the stove. Figure 49: Kelowna Site 3 β 3-day Period 28 947.817 kBtu/GJ 29 The parasitic load on the wood pellet stove is calculated from the measured water heating load delivered per the following equation: πππππ ππ‘ππ πΏπππ (π΅π‘π’) = πππ‘ππ π»πππ‘πππ πΏπππ π·ππππ£ππππ (π΅π‘π’) β (πΆππ β 0.9). This assumes a 10% tank loss and is the energy βpumpedβ out of the room air and what allows a heat pump to achieve a COP greater than 1.0. For various reasons, the heat removed by the heat pump will not always equal the heat put back in the space. For example, heat removed during the summer is valuable and is not replaced by the heating source. 52PDF Image | CO2 Integrated Heat Pump Water Heater
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