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Residential Ducts. Bruce Wilcox, BSG John Proctor, PEG Ken Nittler, Enercomp. Changes for Duct Systems. Increase prescriptive duct insulation from R-4 to R-8 in climate zones 1 through 5 and 9 through 16 Improved treatment of air conditioning air flow and fan energy:

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Presentation Transcript
residential ducts
Residential Ducts
  • Bruce Wilcox, BSG
  • John Proctor, PEG
  • Ken Nittler, Enercomp
changes for duct systems
Changes for Duct Systems
  • Increase prescriptive duct insulation from R-4 to R-8 in climate zones 1 through 5 and 9 through 16
  • Improved treatment of air conditioning air flow and fan energy:
    • fan flow measured using 3 methods
    • optional credit for measured fan Watts
    • focus TXV credit on charge only
  • Prohibit porous inner core flex duct
prescriptive duct insulation
Prescriptive Duct Insulation
  • Currently R-4.2
  • Proposed
    • R-8 in climate Climate Zones 1 through 5 and 9 through 16
    • remains at R-4.2 in Climate Zones 6, 7 and 8
    • Based on lowest life cycle cost
revised measurement techniques
Revised Measurement Techniques
  • To field verify adequate air flow
    • Flow Capture Hood (current)
    • Plenum Pressure Matching (current)
    • Flow Grid (new)
      • New product
      • Slides into air handler filter slot
      • Fast and Accurate
  • To field verify fan Watts (new)
    • Portable Watt meter
    • Utility Revenue Meter
indoor air handler fan energy
Indoor Air Handler Fan Energy
  • Current:
    • not accounted for in performance compliance
    • defaulted, not realistically tested in ratings
  • New:
    • Standard Design set to field measured average
      • 0.51 W/cfm
      • 0.25 CFM/Btu rated capacity (300 cfm/ton)
    • Proposed defaults to Standard Design
    • optional significant credit for verified reduced Watts with adequate air flow
txv and air flow
TXV and Air Flow
  • Current:
    • TXV assumed to partly compensate for low air flow
  • New:
    • PG&E tests show no effect
    • TXV effect on air flow removed
porous inner core flex duct
Porous inner core flex duct
  • Outer plastic is only air barrier
    • Any damage becomes a leak
  • Prohibited in Florida Energy Code
    • “Flexible ducts having porous inner cores shall not be used.”
  • Same language proposed