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HPWH Performance Report 7. Demand Response Potential Both the Rheem and Sanden HPWHs have good potential for Demand Response (DR). With their large storage tanks, power could be locked out from the heat pump (and electric element of the Rheem) in a 5-hour DR event without any noticeable loss in hot water temperature. Figure 19 illustrates this by showing the period just after a component of one of the 314-litre (80-gallon) Sanden units failed on December 5th, 2016. The last power draw can be seen at 10:14pm when the heat pump stopped heating the water. Without knowing the unit was off, the participants went on to draw 189 litres (50 gallons) of hot water over a 40-hour period before hot water temperature fell below 38°C (100°F) at 2:23pm of December 7th. Especially in the case of the larger tank HPHWs (314-L Sanden and 303-L Rheem), even the largest hot water users would likely not be impacted by a 4 or 5-hour DR event. 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) 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 1,100 HW Temp falls below 38°C (100°F) 1,000 900 800 700 600 500 400 300 200 100 Figure 19: Hot Water Storage °C / Litres per minute Cumulative LIters / Watts 5 00 18PDF 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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