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Proposed Revisions to Deemed Savings Input Assumptions for PTCS Duct Sealing and Heat Pump Efficiency Upgrades and Duct Sealing, Commissioning and Controls in Existing Homes. January 8, 2007. Issue.

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Presentation Transcript
slide1
Proposed Revisions to Deemed Savings Input Assumptions for PTCS Duct Sealing and Heat Pump Efficiency Upgrades and Duct Sealing, Commissioning and Controls in Existing Homes

January 8, 2007

issue
Issue
  • Current deemed savings analysis assumes that existing single family and manufactured homes with heat pumps have the same average size as homes with any electric heating system
  • Average home size assumptions
    • Pre-79 Single Family – 1600 sq.ft
    • Post79/Pre93 Single Family – 2200 sq.ft.
    • Post92 Single Family – 2300 sq.ft.
    • Existing Manufactured Home – 1020 sq.ft
    • New Manufactured Home – 1636 sq.ft..
slide4
Average Pre79 Single Family Homes in Regional Heat Pump Evaluation Were Significantly Larger Than RTF Assumes
slide6
Average Pre79 Manufactured Homes in Regional Heat Pump Evaluation Were Significantly Larger Than RTF Assumes
do these larger homes use proportionately more space heating
Do These Larger Homes Use Proportionately More Space Heating?
  • Compared Regional Heat Pump Evaluation’s Estimated “Pre-Retrofit” Space Heating Use to RTF Assumptions
    • Problems
      • Data for homes with pre-existing heat pump in Heating Zone 1/Cooling Zone 1 (sample primarily from Olympic Peninsula and OR Coast)
      • Sample sizes are small or non-existent, especially for MH
    • Issue: Should these homes usage be used to modify the RTF baseline (Pre-PTCS measure) space heating estimates
slide8
Estimated Single Family Space Heating Use Pre-Retrofit All Forced Air System Types Heating Zone 1 Cooling Zone 1

Were these heat pumps functioning?

slide9
Estimated Single Family Space Heating Use Pre-Retrofit All Forced Air System Types Heating Zone 1 Cooling Zone 2
slide10
Estimated Single Family Space Heating Use Pre-Retrofit All Forced Air System Types Heating Zone 1 Cooling Zone 3

Were these heat pumps functioning?

slide11
Estimated Single Family Space Heating Use Pre-Retrofit Heat Pump Systems Heating Zone 1 All Cooling Zones

Were these heat pumps functioning?

slide12
Estimated Single Family Heat Pump Home Space Heating Use Pre-Retrofit – Heating Zone 1 All Cooling Zones
slide13
Assuming Heat Pumps in Cooling Zone 1 Were Functioning Increases Single Family Baseline Consumptions Estimates – Especially for More Recently Built Homes
slide14
Estimated Manufactured Home Space Heating Use Pre-Retrofit All Forced Air System Types Heating Zone 1 Cooling Zone 1
slide15
Estimated Manufactured Home Space Heating Use Pre-Retrofit All Forced Air System Types Heating Zone 1 Cooling Zone 2
slide16
Estimated Manufactured Home Space Heating Use Pre-Retrofit Heat Pump SystemsHeating Zone 1 All Cooling Zones
slide17
Estimated Manufactured Home Heat Pump Home Space Heating Use Pre-Retrofit – Heating Zone 1 All Cooling Zones
slide18
Single Family Heat Pump Zone 1 Space Heating Evaluation Estimates Compared to Current RTF Assumptions (kWh/sq.ft.)
slide19
Single Family Heat Pump Zone 1 Space Heating Evaluation Estimates Compared to Current RTF Assumptions (kWh/sq.ft.)
slide20
Estimated Single Family Heat Pump Zone 1 Space Heating Evaluation Estimates Compared to Current RTF Assumptions
slide21
Manufactured Home Heat Pump Zone 1 Space Heating Evaluation Estimates Compared to Current RTF Assumptions

Note: Post92 Construction use estimate from RCDP

slide22
Estimated Manufactured Home Heat Pump Zone 1 Space Heating Evaluation Estimates Compared to Current RTF Assumptions

Note: Post92 Construction use estimate from RCDP

recommendation manufactured homes
Recommendation – Manufactured Homes

Note: Estimated use of SGC/Energy Star heat pump homes derived

From RCDP analysis which found annual use of 2.6 – 3.2 kWh/sf/yr.

impact of revised base case space heating use assumptions on ptcs measure cost effectiveness
Impact of Revised Base Case Space Heating Use Assumptions on PTCS Measure Cost-Effectiveness
  • Some changes in status of any heat pump upgrade measures
    • Upgrades for all vintages of MH in all climates zones are now cost-effective, including SGC/NEEM
    • Upgrades for all vintages and foundation types of SF homes in all climates zones are now cost-effective, including half/full basements in Heating Zone 1
  • PTCS Duct sealing, system commissioning & controls measure is now cost-effective for SGC/NEEM homes with existing or newly installed heat pumps in all climates zones
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