Reducing Thermal Losses and Gains With Buried and Encapsulated Ducts in Hot-Humid Climates

Research output: NRELSubcontract Report

Abstract

The Consortium for Advanced Residential Buildings (CARB) monitored three houses in Jacksonville, FL, to investigate the effectiveness of encapsulated and encapsulated/buried ducts in reducing thermal losses and gains from ductwork in unconditioned attics. Burying ductwork beneath loose-fill insulation has been identified as an effective method of reducing thermal losses and gains from ductwork indry climates, but it is not applicable in humid climates where condensation may occur on the outside of the duct jacket. By encapsulating the ductwork in closed cell polyurethane foam (ccSPF) before burial beneath loose-fill mineral fiber insulation, the condensation potential may be reduced while increasing the R-value of the ductwork.
Original languageAmerican English
Number of pages89
StatePublished - 2013

Bibliographical note

Work performed by Consortium for Advanced Residential Buildings (CARB), Norwalk, Connecticut

NREL Publication Number

  • NREL/SR-5500-55876

Other Report Number

  • DOE/GO-102013-3719

Keywords

  • Building America
  • buried ducts
  • closed cell polyurethane spray foam insulation (CCSPF)
  • Consortium for Advanced Residential Buildings (CARB)
  • distribution system efficiency
  • duct losses
  • encapsulated ducts
  • encapsulated/buried ducts
  • existing homes
  • hot-humid climates
  • residential
  • residential buildings
  • space conditioning
  • unconditioned attics

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