Proposed Revisions to Deemed Savings Input Assumptions for PTCS  Duct Sealing and Heat Pump Efficien...
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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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January 8, 2007

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January 8 2007

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..


Average size of single family homes in regional heat pump savings evaluation

Average Size of Single Family Homes in Regional Heat Pump Savings Evaluation


January 8 2007

Average Pre79 Single Family Homes in Regional Heat Pump Evaluation Were Significantly Larger Than RTF Assumes


Average size of manufactured homes in regional heat pump savings evaluation

Average Size of Manufactured Homes in Regional Heat Pump Savings Evaluation


January 8 2007

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


January 8 2007

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

Were these heat pumps functioning?


January 8 2007

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


January 8 2007

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

Were these heat pumps functioning?


January 8 2007

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

Were these heat pumps functioning?


January 8 2007

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


January 8 2007

Assuming Heat Pumps in Cooling Zone 1 Were Functioning Increases Single Family Baseline Consumptions Estimates – Especially for More Recently Built Homes


January 8 2007

Estimated Manufactured Home Space Heating Use Pre-Retrofit All Forced Air System Types Heating Zone 1 Cooling Zone 1


January 8 2007

Estimated Manufactured Home Space Heating Use Pre-Retrofit All Forced Air System Types Heating Zone 1 Cooling Zone 2


January 8 2007

Estimated Manufactured Home Space Heating Use Pre-Retrofit Heat Pump SystemsHeating Zone 1 All Cooling Zones


January 8 2007

Estimated Manufactured Home Heat Pump Home Space Heating Use Pre-Retrofit – Heating Zone 1 All Cooling Zones


January 8 2007

Single Family Heat Pump Zone 1 Space Heating Evaluation Estimates Compared to Current RTF Assumptions (kWh/sq.ft.)


January 8 2007

Single Family Heat Pump Zone 1 Space Heating Evaluation Estimates Compared to Current RTF Assumptions (kWh/sq.ft.)


January 8 2007

Estimated Single Family Heat Pump Zone 1 Space Heating Evaluation Estimates Compared to Current RTF Assumptions


January 8 2007

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

Note: Post92 Construction use estimate from RCDP


January 8 2007

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

Note: Post92 Construction use estimate from RCDP


Recommendation single family

Recommendation – Single Family


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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