Modeling the thermal distribution efficiency of ducts: Comparisons to measured results

Paul W. Francisco, Larry Palmiter, Bob Davis

Research output: Contribution to journalArticlepeer-review


This paper presents a comparison of predictions from a duct efficiency model developed by the authors with measured real-time heating system efficiency measurements from six site-built residential homes with natural gas furnaces in the Puget Sound region. The model takes into account the interaction between supply and return side losses, the interaction between conduction and air leakage losses, the interaction between unbalanced leakage and natural infiltration, and the recovery of heat through the building envelope from ducts in various locations within the home. It does not take into account losses due to cycling. Field testing was done using a short-term coheating methodology. Both the modeling and tests were done before and after aggressive duct air leakage sealing and insulation retrofits.

Original languageEnglish (US)
Pages (from-to)287-297
Number of pages11
JournalEnergy and Buildings
Issue number3
StatePublished - Nov 1998
Externally publishedYes


  • Air duct
  • Air leakage
  • Heating system
  • Natural gas furnace

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanical Engineering
  • Electrical and Electronic Engineering


Dive into the research topics of 'Modeling the thermal distribution efficiency of ducts: Comparisons to measured results'. Together they form a unique fingerprint.

Cite this