Passive Room-to-Room Air Transfer, Fresno, California (Fact Sheet)

D. Stecher, A. Poershke

Research output: NRELFact Sheet


Field testing was performed in a retrofit unoccupied test house in Fresno, California. Three air-based heating, ventilation, and air conditioning (HVAC) distribution systems - a typical airflow ducted system to the bedrooms, a low airflow ducted system to the bedrooms, and a system with no ductwork to the bedrooms - were evaluated during heating, cooling, and midseason conditions. The relativeability of each of the three systems was assessed with respect to relevant Air Conditioning Contractors of America (ACCA) and ASHRAE standards for house temperature uniformity and stability, respectively. Computational fluid dynamics (CFD) modeling also was performed and refined based on comparison to field test results to determine the air flow rate into the bedrooms of over-door andbottom-of-door air transfer grilles.
Original languageAmerican English
Number of pages2
StatePublished - 2014

NREL Publication Number

  • NREL/FS-5500-60714

Other Report Number

  • DOE/GO-102014-4300


  • 50% Building America benchmark
  • ACCA Manual RS
  • Building America
  • CFD
  • computational fluid dynamics
  • field test results
  • Fresno, California
  • hot mixed-dry
  • HVAC
  • low airflow
  • mini-split
  • model validation
  • occupant comfort
  • residential
  • residential buildings
  • retrofit unoccupied test house
  • room-to-room uniformity
  • simplified space cond
  • single point
  • space conditioning


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