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Mission Valley Power Energy Efficient Home Program Deemed Savings Analysis

Mission Valley Power Energy Efficient Home Program Deemed Savings Analysis. August 5, 2008. Background. Mission Valley Power (MVP) request 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 Deemed Savings Analysis

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  1. Mission Valley Power Energy Efficient Home ProgramDeemed Savings Analysis August 5, 2008

  2. Background • Mission Valley Power (MVP) request 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.

  3. MVP Deemed Savings Analysis – R-10 Full Slab w/R-5 Thermal Break • Used WattSUN model w/Kalispell Weather • 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) • Savings = 1.5 kWh/sq.ft. of slab

  4. 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 • Results • EStar Home BOP 2 = 32% savings • MVP Home = 36% savings

  5. Savings Input Assumptions – Crawlspace Home, Zonal Electric *MT Code does not require below grade walls to be insulated until “finished.” EStar & MVP require R-21 insulation at time of construction.

  6. Issues • Specifications • Perimeter insulation permitted in lieu of R-38 under floor (may not produce equivalent energy savings) • Assumed duct leakage rate for forced-air systems not specified • MVP requires 25% of sockets w/EStar Lighting, EStar requires 50% - Net impact on savings not quantified in analysis • No HRV required, even though savings are claimed for reduce infiltration • Quality Assurance • Performance testing of ducts is not required • 0.30 ach Air tightness verified by random testing (same as EStar, but EStar assumes 0.35 ach)

  7. Results of Review – R10 Full Slab • SEEM Model used to estimate use and savings • Full R-10 Slab w/R-5 Thermal Break • WattSun Savings = 1.5 kWh/sq.ft. slab (zonal electric) • SEEM Savings = 1.0 kWh/sq.ft. slab (zonal electric) • No Cost Data Yet to Determine Cost-Effectiveness

  8. Results of Review – MVP Home Savings

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