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HPWH Performance Report Figure 51: Kelowna Site 4 Monthly Performance 4 3 2 0.97 1.16 0 January February 2.95 2.94 40 35 30 25 20 15 10 1.02 5 0 1 1.51 March 1.49 November 1.78 April Measured COP 1.89 2.35 May 2.46 2.47 June Calculated COP July August Average Air Temperature September October December -5 -10 In November 2017, towards the end of the monitoring period, we unducted the Kelowna Site 4 unit to measure the impacts of using tempered basement air during the cold Kelowna winter. Figure 52 compares the ducted and unducted performance from the first winter of the study (ducted) and the second winter (unducted). Expectedly, even though the average outside air temperature was similar from one year to the next, the unducted unit performed better than the ducted unit due to the basement temperature remaining warmer during the cold winter. We did not calculate the interactive space heating effects that occur when using the unducted method as a part of this study. Additionally, an unducted unit would take a penalty during the summer months when the basement remained cooler than outside air. Figure 52: Kelowna Site 4 Monthly Ducted and Unducted COP Looking at the same 3-day period shown before in Figure 49 of Kelowna Site 3 (January 2nd to January 5th), there is a much different picture. Figure 53 shows that during the same period, the unit runs entirely in electric resistance mode during water heating with numerous water draws over 15 4 3 2 1 0 2.95 2.94 40 35 30 25 20 15 1.54 10 2.35 2.46 2.47 1.78 1.89 1.81 1.51 1.55 1.02 0.97 5 0 -5 -10 1.16 1.29 Dec-16 Jan-17 Feb-17 Mar-17 Apr-17 May-17 Jun-17 Jul-17 Aug-17 Sep-17 Oct-17 Nov-17 Dec-17 Jan-18 Feb-18 Ducted COP Unducted COP Average Outside Air Temperature 56 COP COP Average Outside Air Temperature (°C) Ambient Air Temperature (°C)PDF Image | CO2 Integrated Heat Pump Water Heater
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