Automobile hvac systems

Air flow, leakage and their effects on in-vehicle air quality

Luke D. Knibbs*, Richard J. De Dear, Steven E. Atkinson

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

2 Citations (Scopus)

Abstract

We have sought to accurately quantify automobile HVAC air flow rates in four passenger vehicles, under a range of different ventilation settings and speeds. We used Sulphur Hexafluoride (SF 6) as a tracer gas, coupled with a portable doser/sampler system to quantify flow rates and leakage. Results of this work indicate a linear increase in HVAC air flow rate with increasing vehicle speed for all vehicles. Older vehicles were much less airtight than newer vehicles, a likely reflection on improved design and reduced door seal deterioration observed in the newer vehicles. HVAC systems in newer vehicles generally delivered a smaller volume of air than older vehicles under the same ventilation settings. The results are of particular interest to those involved with engineering and modelling in-vehicle environments and associated HVAC systems, especially in relation to pollutants. For example, subsequent air quality assessments in the same fleet of vehicles indicated that the inside/outside ratios of combustion-derived submicrometer particle concentrations were highest inside the cabins of the oldest vehicle.

Original languageEnglish
Title of host publicationIAQVEC 2007 Proceedings - 6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: Sustainable Built Environment
Pages191-199
Number of pages9
Volume2
Publication statusPublished - 2007
Event6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: Sustainable Built Environment, IAQVEC 2007 - Sendai, Japan
Duration: 28 Oct 200731 Oct 2007

Other

Other6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: Sustainable Built Environment, IAQVEC 2007
CountryJapan
CitySendai
Period28/10/0731/10/07

Keywords

  • AER
  • Air flow
  • Automobile
  • Leakage
  • Vehicle

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