Download the project report.

LIST OF FIGURES
Figure 1: Basic Refrigeration Cycle............................................................................................................. 8
Figure 2: DOE Standard Test Stand............................................................................................................. 9
Figure 3: ATS Water Heater Laboratory (Six Test Stands)....................................................................... 10
Figure 4 Add-on AirTap A7 HPWH above tank ....................................................................................... 13
Figure 5 Rheem Integral HPWH................................................................................................................. 13
Figure 6: Rheem HP50 Modes of Operation ............................................................................................. 15
Figure 7: First Hour Rating Test – AirTap A7 Heat Pump Only.............................................................A-4
Figure 8: First Hour Rating Test – AirTap A7 with Upper Heating Element..........................................A-4
Figure 9: First Hour Rating Test – Rheem HP50 Energy Saver Mode....................................................A-5
Figure 10: First Hour Rating Test – Rheem HP50 Energy Saver Mode..................................................A-5
Figure 11: First Hour Rating Test – Rheem HP50 Normal Mode ...........................................................A-6
Figure 12: DOE Standard Energy Factor Draw Profile ...........................................................................A-6
Figure 13: Energy Factor Test Start – AirTap A7 Heat Pump Only........................................................A-7
Figure 14: Energy Factor Test Start – Rheem HP50 Normal Mode ........................................................A-7
Figure 15: Energy Factor Test Start – Rheem HP50 Energy Saver Mode...............................................A-8
Figure 16: HPWH Power Sensitivity to Tank Temperature ....................................................................A-8
Figure 17: AirTap Recovery Efficiency Sensitivity to Ambient Temperature ........................................A-9
Figure 18: Rheem Recovery Efficiency Sensitivity to Ambient Temperature ........................................A-9
Figure 19: AirTap Average Power Sensitivity to Ambient Temperature ..............................................A-10
Figure 20: Rheem Average Power Sensitivity to Ambient Temperature...............................................A-10
Figure 21: Net Cooling Effect from Heat Pump Water Heater..............................................................A-11
Figure 22: PG&E Residential Electric Rate E-1....................................................................................A-11
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