Deemed Savings Input Assumptions for PTCS Duct Sealing in Existing Manufactured Homes - PowerPoint PPT Presentation

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Deemed Savings Input Assumptions for PTCS Duct Sealing in Existing Manufactured Homes PowerPoint Presentation
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Deemed Savings Input Assumptions for PTCS Duct Sealing in Existing Manufactured Homes

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Deemed Savings Input Assumptions for PTCS Duct Sealing in Existing Manufactured Homes
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Deemed Savings Input Assumptions for PTCS Duct Sealing in Existing Manufactured Homes

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Presentation Transcript

  1. Deemed Savings Input Assumptions for PTCS Duct Sealing in Existing Manufactured Homes February 10, 2004

  2. Current Assumptions

  3. Basis for Reconsideration • Pre & Post Duct Blaster Test on nearly 2400 Manufactured Homes • Data implies that “baseline” duct leakage is higher than assumed • Revised Duct System Efficiency model (used for PTCS “sliding scale” calculator) specifically addresses manufactured home construction

  4. Pre-PTCS Duct Sealing CFM/SF25

  5. Post-PTCS Duct Sealing CFM/SF25

  6. Difference Between Pre & Post PTCS Duct Sealing - CFM/SF25

  7. Summary Statistics

  8. More Summary Statistics

  9. Still More Summary Statistics

  10. Recommendation • Use “Median” differential value of 80 CFM25 as most representative of distribution of both pre and post-PTCS duct tightness • Use PTCS “Sliding Scale” deemed savings calculator duct modeling assumptions for manufactured homes to to derive deemed savings

  11. Revised Assumptions

  12. Current vs Revised Credits