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Mission Valley Power Energy Efficient Home Program and GSHP Deemed Savings Analysis

Mission Valley Power Energy Efficient Home Program and GSHP Deemed Savings Analysis. September 30, 2008. Background. Mission Valley Power (MVP) requested that the RTF review its specifications for a new residential construction program to establish a deemed savings value and cost-effectiveness

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Mission Valley Power Energy Efficient Home Program and GSHP Deemed Savings Analysis

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  1. Mission Valley Power Energy Efficient Home Program and GSHPDeemed Savings Analysis September 30, 2008

  2. Background • Mission Valley Power (MVP) requested that the RTF review its specifications for a new residential construction program to establish a deemed savings value and cost-effectiveness • MVP also provided an analysis of the potential savings from requiring R-10 full under slab insulation with an R-5 slab edge thermal break for RTF review and potential adoption as a deemed measure • Lincoln Electric also requested that the RTF review the cost-effectiveness of Geothermal Heat Pumps installed in MVP or Energy Star homes

  3. MVP Deemed Savings Analysis – R-10 Full Slab w/R-5 Thermal Break • Used WattSUN • Assumed MT Code as baseline, then modeled full slab insulation w/ thermal break (UA 549) vs UA 518) • Wall (Above Grade) = R-19 • Wall (Below Grade) = R-11 (0.054 base/0.056 w/full slab) • Attic = R-38 • Glazing = U- 0.35 • Door = U-0.19 • On grade slab – R-0 (F-0.73) & R-10 w/R-5 TB (F-0.36) • Below grade slab = R-0 (F-0.56) & R-10 w/R-5 TB (F-0.42) • MVP Supplied Cost Data - $0.85 sq.ft.

  4. Results of Review – R10 Full Slab • WattSun Savings = 1.5 kWh/sq.ft. slab • WattSUN savings are based on (TMY2) • Used Kalispell weather • Zonal electric heating assumed • SEEM Savings • Based on TMY 3 • Used Missoula weather (Zone 3 Reference site) • Analyzed 5 heating system types

  5. Results of Review – R10 Full Slab Savings (2)

  6. Results of Review – R10 Full Slab Cost- Effectiveness (3)

  7. MVP Deemed Savings Analysis – Energy Efficient Home • Used WattSUN model w/Kalispell Weather • Assumed MT Code as baseline, compared to • EStar Home BOP 2 • MVP Home specifications • WattSUN Results • EStar Home BOP 2 = 32% savings • MVP Home = 36% savings

  8. Savings Review Input Assumptions – Crawlspace Home *Assumed value for unconditioned crawl space. Construction not allowed under EStar BOP2.

  9. Savings Review Input Assumptions – Slab & Heated Basement *MT Code does not require below grade walls to be insulated until “finished.” EStar & MVP require R-21 insulation at time of construction.

  10. Results of Review – MVP Home Zonal Electric Space Heating Savings Not Equivalent To or Better Than EStar BOP2 10

  11. Results of Review – MVP Home Forced Air Furnace w/o CAC Space Heating Savings Not Equivalent To or Better Than EStar BOP2

  12. Results of Review – MVP Home Air Source Heat Pump Space Heating Savings MVP+ = Requires PTCS Controls (Outside Thermostat & No First Stage Resistance & ARI Staging 12

  13. MVP Home Proposed Lighting Specifications Impact on Savings • MVP Proposal – 25% of sockets @ CFL • EStar Requirement – 50% of sockets @ CFL

  14. Results of Review – MVP Home Zonal Electric Space Heating + Lighting Savings Not Equivalent To or Better Than EStar BOP2 14

  15. Results of Review – MVP Home Forced Air Furnace w/o CAC Space Heating Savings Not Equivalent To or Better Than EStar BOP2 15

  16. Results of Review – MVP Home Air Source Heat Pump Space Heating + Lighting Savings MVP+ = Requires PTCS Controls (Outside Thermostat & No First Stage Resistance & ARI Staging 16

  17. Summary of MVP Home Findings *Requires PTCS Controls (Outside Thermostat & No First Stage Resistance Heating & ARI Staging of Backup

  18. Recommendations • Establish deemed savings for R10 full slab insulation • Establish New Technical Compliance Option (TCO) for MVP Homes that produce savings equivalent to existing Energy Star Builder Option Packages (BOPs) • Establish deemed savings for MVP Homes that are not equivalent to Energy Star • Establish deemed savings for GSHP conversions and upgrades installed MVP Homes

  19. Geothermal Heat Pump Cost-Effectiveness • Existing GSHP Cost Data from Oregon Trail Coop, supplemented by Ravalli, Flathead and Lincoln Electric • OTEC Average Installed Cost/Ton = $3,363 • MT Coop Average Installed Cost/Ton = $3,327 • All GSHP Installations assumed to install de-superheater ($1150) which saves additional 1200 kWh/yr (33% of DHW use) • SEEM FAF Use adjusted for GSHP COP and SEER • COP = 3.3 • SEER = 16 • No PTCS Duct Sealing or Commissioning Assumed All cost adjusted to 2006$

  20. Cost-Effectiveness Input Assumptions – Space Heating Use

  21. Cost-Effectiveness Input Assumptions - Costs

  22. Cost-Effectiveness Results – Total Resource Benefit/Cost Ratio

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