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PTCS Ducts Inside Single Family New Construction

PTCS Ducts Inside Single Family New Construction. Energy Savings and Cost Regional Technical Forum May 5, 2009. Assumptions. Cost $350 for PTCS Duct Sealing $650 to move ducts inside $300 for incremental cost where duct sealing was required Savings (Method: SEEM) 2200 ft 2 prototype

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PTCS Ducts Inside Single Family New Construction

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  1. PTCS Ducts InsideSingle Family New Construction Energy Savings and Cost Regional Technical Forum May 5, 2009

  2. Assumptions • Cost • $350 for PTCS Duct Sealing • $650 to move ducts inside • $300 for incremental cost where duct sealing was required • Savings (Method: SEEM) • 2200 ft2 prototype • Insulation Package: Energy Star shell • Heating System Type/Efficiency: 8.5 HSPF/SEER 13 heat pump with PTCS controls • Duct Leakage • Unsealed (baseline “a”) – 12% Supply; 10% Return • Energy Star Sealing (baseline “b”) - 6% Supply; 3% Return • Ducts Inside (upgrade) – 1% Supply; 1% Return (achieved by following PTCS Ducts Inside Specs) • Measure life = 25 years • Crawlspace weighting – 90%; Slab on grade weighting – 10% • (Reminder: This measure only applies to houses with < 50% basement or conditioned crawlspace, by overall foundation area) • PNW Cooling Weightings

  3. Results (Recommendation)

  4. Assumption: Heat Pump System Efficiency Q: Why not assume 7.7 HSPF w/o PTCS Controls? A: Savings are similar: (Also, using one assumption simplifies program design, and by assuming 8.5 HSPF, there won’t be double-counting of savings if/when a heat pump efficiency upgrade occurs.)

  5. Assumption: Heating System Type Q: What about the savings where a house has an electric FAF? A: Recommend savings calculation assumes a heat pump is installed, for the following reasons: - Add conservatism to the modeled savings calculation (which doesn’t account for wood heat) - Program simplicity (not many new single family homes heated with electric FAF’s)

  6. Assumption: Slab/Crawlspace Mix Q: What justifies melding the slab savings at 10% and crawlspace savings at 90%? A: They have similar savings (and it’s simpler for programs to have one measure):

  7. Assumption: Cooling Weightings Q: Why use PNW mix instead of actual cooling zones? A: Cooling savings are insignificant , so introduced error is minor . Simplifies program design & implementation Note: Assumes crawlspace and 8.5 HSPF heat pump w/PTCS Controls

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