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

Deemed Savings Input Assumptions for PTCS Duct Sealing in Existing Manufactured Homes. February 10, 2004. Current Assumptions. Basis for Reconsideration. Pre & Post Duct Blaster Test on nearly 2400 Manufactured Homes Data implies that “baseline” duct leakage is higher than assumed

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

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  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

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