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Table of Figures Figure 1. HPWH Plant Schematic and Monitoring Equipment Locations............................................... 5 Figure 2. Sanden HPWHs After Pipe Insulation (CU-1, 2, 3 and 4) ........................................................... 7 Figure 4. Temperature Maintenance DHW Storage Tank Before Pipe Insulation ( ST-4) ................. 8 Figure 3. Primary DHW Storage Tanks Before Pipe Insulation (ST1, 2, and 3) .................................... 8 Figure 5. Electronic Mixing Valve and Valve Controller (TMV-1)............................................................... 8 Figure 6. Instantaneous Electric Water Heater (Existing EB-1) ................................................................... 8 Figure 7. M&V Temperature Sensor and Flow Meter.................................................................................... 8 Figure 8. Snowstorm and Tree Damage to CU-3. ........................................................................................... 9 Figure 9. Daily Average Air and Water Temperatures.................................................................................13 Figure 10. Average Water Use (GPM) by Hour of Day (Leak event removed)....................................14 Figure 11. Daily Hot Water Used by Occupants (GPD/apartment).........................................................15 Figure 12. DHW System COP by Outside Air Temperature.......................................................................16 Figure 13. HPWH Run Times.................................................................................................................................17 Figure 14. Redline Demarcating Power Input (kW) 3 vs 4 Operable HPWH .......................................18 Table of Tables Table 1. Summary Measurements.......................................................................................................................10 Table 2. HPWH Retrofit Installation Cost Calculations................................................................................20 Table 3. Major Measurement and Verification Events.................................................................................25 Acronyms aCOPDHWSys ASHRAE BUH BtuH BTU/Hr CO2 COP CW DHW EB ERWH F GPD Gal/yr Annual Coefficient of Performance of the Domestic Hot Water System American Society of Heating, Refrigerating and Air-Conditioning Engineers Backup Heater British Thermal Unit-hours British Thermal Unit per Hour Carbon Dioxide Coefficient of Performance City Water Domestic Hot Water Electric Boiler Electric Resistance Water Heater Fahrenheit Gallons per Day Gallons per Year BONNEVILLE POWER ADMINISTRATION ivPDF Image | CO2 Heat Pump Water Heater Multifamily Retrofit
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