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HPWH Performance Report Manufacturer Sanden Rheem Installation Complexity Higher Lower De dicate d Ele ctrical Circuit? Required Ele ctrical Pe rmit Required? Yes Ave rage Installation Labor Hours 21.3 10.5 Ave rage Installtion Cost (CAD) $8,588 $4,135 Ave rage Incre me ntal Cost (CAD) $5,955 $1,558 1.3 Demand Response Potential Table 3: Installation Complexity and Cost Summary Not Required Not Typically While assessing the demand response (DR) potential of these technologies was not the primary objective of this field trial, we did have a unique event that allowed us to simulate a DR event in the real world. On December 5th, 2016 one of the 315 litre (83 gallon) Sanden units stopped operating after the printed circuit board (PCB) failed.1 After the heat pump stopped operating the participant continued to draw 189 litres (50 gallons) over a 40 hour period before hot water temperature fell below 38°C (100°F).2 A previous demand response study (Sullivan et al., 2015)3 also found that the 315 litre Sanden could deliver water at 49°C (120°F) hot water temperature for 12 hours after the system was powered off with a much higher simulated water draw of 492 litres per day (130 gallons). The 315 L Sanden tank has more than enough thermal storage to maintain hot water temperature during a four-hour demand response event. Based on tank size and water temperature, the smaller Sanden and two Rheem units also likely have sufficient capacity for a four-hour demand response event. The Rheem units also comes standard with the EcoNet interface which according to the manufacturer is “future-compatible with demand-response system”. Figure 3: Hot Water Draws and Temperature After Unit Powers Off Hot Water Temp (°C) Water Draw (Litres/min) 12/5/16 @ 10:14 PM Last Power Draw Water @ 55°C (131°F) Power (W) Cumultative Water Draw (Litres) 1,400 1,300 1,200 12/7/16 @ 2:23 PM HW Temp falls 1,100 below 38°C (100°F) 1,000 900 800 700 600 500 400 300 200 100 1 The PCB failed due to a condensation issue from ambient air infiltration. The unit was quickly replaced by Sanden and the issue has been resolved in the 3rd generation units (GS3). For more information see the installation details of Rossland Site 3 in Section 10.3. 2 The participant continued to draw hot water after the 40-hour period and did not contact Fortis BC about the loss of hot water until nearly 3 days after the unit failed. 3 Sullivan, G.; Petersen, J.; 2015. Demand-Response Performance of Sanden Unitary/Split-System Heat Pump Water Heaters, Pacific Northwest National Laboratory 70 65 60 55 50 45 40 35 30 25 20 15 10 After unit failure: 189 litres (50 gallons) were drawn over a 40 hour period before HW fell below 38°C (100°F) °C / Litres per minute Cumulative LIters / Watts 5 00 3PDF Image | CO2 Integrated Heat Pump Water Heater
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