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HPWH UES Measure Initial Review. 16 April 2014. Agenda. Provisional Measure Review Method Overview Prelim Findings Measure Development Approach Simulation Validation Please provide feedback and concerns throughout. This is a brainstorming session as much as a presentation.

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Presentation Transcript
  • Provisional Measure Review
  • Method Overview
  • Prelim Findings
  • Measure Development Approach
  • Simulation Validation

Please provide feedback and concerns throughout. This is a brainstorming session as much as a presentation.

current provisional measures
Current Provisional Measures
  • HPWH Type:
    • Tier 1, 50-75 gallons
    • Tier 1, 75+ gallons
    • Tier 2
  • Unheated buffer locations
    • Includes garages and basements together
  • Heated installations
    • One measure for each of gas furnace, electric furnace, zonal resistance, and heat pump heating
      • Tier 1 water heaters have no exhaust ducting
      • Tier 2 water heaters all have exhaust ducting
  • The measures cross the entire PNW and are not separated by climate zone
proven unit energy savings
Proven Unit Energy Savings
  • Calibrated Engineering Approach
    • Heat Pump Water Heater Model Validation and Process Evaluation Project designed specifically to move HPWH measure from provisional to proven status.
      • Even designed under the current guidelines (hooray!)
    • Final energy savings will be calculated with a simulation of HPWH behavior
      • Inputs to simulation need to be solid
      • Simulation needs to be validated
simulation inputs characteristics
Simulation Inputs & Characteristics
  • Simulation inputs come from the completed field studies:
    • Inlet water temperature, ambient air temperature, tank set point, water draw pattern
    • Investigated, categorized, and normalized where necessary (e.g. by climate or number of occupants)
  • To extend to entire PNW, additional characteristics will come from RBSA survey
    • Ex: occupant count
simulation validation
Simulation Validation
  • Validated against field measurements of energy use
    • Categorized by climate, equipment type, installation location, draw patterns, etc.
preliminary findings subject to change your mileage may vary etc
Preliminary Findings(subject to change. your mileage may vary. etc.)
  • Findings used in two, broad ways:
    • For simulation inputs
    • To validate outputs

Findings are as expected:

  • Energy use GeoSpring>Voltex>ATI
  • Resistance heat slope is about 0.2 kWh/gal

Findings are as expected:

  • Energy use Garage>Basement>Interior
more findings
More Findings
  • Inlet water
    • by region / climate
  • Ambient air temperature
    • by install location
  • Outlet water
    • input from site visit records on setpoints
    • measured outlet temperatures

Will use inlet measurements to build inlet water temperature profiles for use in simulation as a function of geography

creating hot water draw profiles
Creating Hot Water Draw Profiles
  • Average daily use per person: 17.1 gallons
    • Provisional measure used 18.2 gallons
  • Will also investigate the following to inform our draw patterns:
    • Average number of draws per person per day
      • at 1 gallon resolution
    • Draw sizes
      • Ex: # of 1 gal draws, # of 2 gal draws, # of 3 gal draws, etc….
final ues development approach
Final UES Development Approach
  • Categories and Prototypes
    • Are calculated and modeled separately but then combined with weighted averages to produce ultimate savings estimates
      • Climate Zone
      • Installation Location
      • Heating System Type
      • Prototypical Draw Patterns
        • 1, 2, & 4 person draws
key assumptions
Key Assumptions
  • RBSA population characteristics represent the houses installing HPWHs
  • Water draws are the same between ERWH and HPWH
    • Both are storage tanks
    • Metered energy data from DHP study and RBSA Metering study can help confirm
  • Space heating interaction
    • Fractional or full?
      • Current assumption for interior installations is full interaction: one unit of heat removed from the air in the heating season is replaced by one unit of heat output from the heating system
    • Supplemental heat
      • A negative heating interaction will show up as a change in supplemental heat requirements. Those heat requirements, per the DHP analysis, will show up as a cost in the non-energy benefits stream and not as a penalty to the electric grid.
  • All analysis currently underway
  • Report writing in April & May
  • Workbook development in May & June
  • Workbook refinement in June & July
  • Final report before RTF presentation
  • Full RTF presentation in July or August
simulation validation1
Simulation Validation
  • Graphs of metered and simulated data
  • Work still underway to tune the simulation