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Heat Pump Water Heaters. Provisional UES Proposal Regional Technical Forum October 4 th , 2011. Introduction. More time for discussion today than at the last meeting Decision today? We’ll see how it goes. What changed from last meeting 45 gal/day

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heat pump water heaters

Heat Pump Water Heaters

Provisional UES Proposal

Regional Technical Forum

October 4th, 2011

  • More time for discussion today than at the last meeting
  • Decision today?
    • We’ll see how it goes.
  • What changed from last meeting
    • 45 gal/day
      • (was 40 gal/day for small tank and 60 gal/day for large tank)
    • Aggregated many measures (from 108 to 15 measures)
    • Tank size definitions
      • Small: 50 to 75 gallons
        • (was 55 gal or less)
      • Large: more than 75 gallons
        • (was greater than 55 gal)
    • Other more minor changes (we’ll point them out)
measure summary
Measure Summary
  • Measure name: Heat Pump Water Heater
  • Measure description
    • Installation of a heat pump water heater instead of a standard electric tank water heater in single family site built homes.
  • Measure type: UES
  • Today’s Request: Discussion, Review, (Decision???)
  • Change in measure status: Proposed Provisional
  • Change in measure savings: n/a
  • Change in measure cost effectiveness: n/a
  • Other or follow-on work for RTF: Tier 2 interior
measure life
Measure Life
  • 15 years
    • Same as standard RTF water heater measures.
    • Northern Climate Specification warranty requirements:
      • Tier 1: 6 years (Energy Star)
      • Tier 2: 10 years

Eight Interior Tier 1 Measures

  • Annual Savings (kWh/yr)

One Unheated Buffer Space, Small Tank, Tier 1 Measure

One Unheated Buffer Space, Large Tank, Tier 1 Measure

One Unheated Buffer Space Tier 2 Measure

Four Interior Tier 2 Measures

plans for additional ues s
Plans for Additional UES’s
  • Tier 2, Interior, with required Exhaust Duct
    • Plan to model within revised version of SEEM
      • New SEEM model (available this month) will perform a more detailed hourly simulation of whole house infiltration
        • This will include the ability to input exhaust fan schedules.
study design
Study Design

From the Guidelines, for provisional UES status:

“A study design has been developed that is likely to result in data on efficient-case energy consumption that will support RTF approval for active UES values.”

study design1
Study Design
  • Goal: Collect data useful in determining the next iteration of provisional UES for heat pump water heater measures.
    • Intentionally straying from Guidelines’ purpose of provisional data collection due to:
      • measure’s potential importance to the Region
      • expected evolution of HPWH technology over the next few years
  • Three primary data collection areas
    • Hot Water Consumption
    • Space Conditioning Interaction (model inputs)
    • In-field COP
  • Study Dates
    • Site/Participant recruitment
      • Program participants through 3/31/2013
      • Overlap of site selection across data collection areas expected
    • Study data collection period: 6/1/2013 – 5/31/2014
      • Installation of monitoring equipment would occur well before 6/1/2013
    • Provisional UES Sunset Date: 12/31/2014
study area hot water consumption
Study Area: Hot Water Consumption
  • Data Collected
    • Monthly hot water consumption (gallons)
  • Sample
    • 200 sites
      • Random/representative sample of program participants
study area space heat interaction
Study Area: Space Heat Interaction
  • Data Collected
    • Unheated Buffer Space-to-House UA
    • Unheated Buffer Space estimate of internal gains (equipment audit)
  • Sample
    • 50 sites
study area in field cop
Study Area: In-Field COP
  • Data Collected
    • Hot water consumption (gallons)
    • Unheated Buffer Space-to-House UA
    • Unheated Buffer Space estimate of internal gains (equipment audit)
    • HPWH energy consumption
      • Compressor and Fan
      • Electric resistance
    • ΔT of water delivered
    • Ambient temperature
    • For tier 2 (assumes constant speed fan):
      • Two-time measurement of
        • airflow
        • incoming air temperature
  • Sample
    • 75 sites
      • Site selections weighted by program occurrence of HPWH model, installation location, and heating zone.
open issues 1
Open Issues (1)
  • Baseline Energy Use Reliability
    • RCDP cycle 2 data too old? (from early 1990’s)
    • Is the 2.5 people/house assumption reliable?
    • Applying 45 gpd to both tank sizes
      • Will it “reliably” represent the future program participants?
open issues 2
Open Issues (2)
  • Study Design
    • Adequate Study Areas?
    • Sample sizes?
      • Need input/statistics applied
      • Operating modes – will study design capture the “average” operating mode?
    • Length of study
    • Need a Control Group?
open issues 3
Open Issues (3)
  • Analysis Approach
    • Gallons Per Day versus Household Size
      • Current proposal does not distinguish between household size.
    • Gallons Per Day versus ODT
      • Current proposal assumes the same volume of water every day of the year.
      • RCDP (kWh/month) and EPRI (gal/month) data show significant variation by month; DOE TSD shows significant variation by season.
      • Study Design allows future analysis to vary gal/day by outdoor temperature.
    • Space Heat Interaction
open issues 4
Open Issues (4)
  • Sunset Date
    • 12/31/2014
      • Expected timing for study results and analysis completion
    • Also
      • New/revised equipment expected
      • New Federal Standard effective April 16, 2015
  • Measure Life
if there were to be a motion today it might look something like this
IF there were to be a motion today, it MIGHT look something like this:

“I _________ move that the RTF approvethe UES for Heat Pump Water Heaters under provisional status with a sunset date of December 31st, 2014.”

(Tier 2 interior location heat pump water heaters will be pursued/added at a later date.)