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Related Concept Videos

Assessment of Ventilation II: Respiratory Depth and Rhythm01:29

Assessment of Ventilation II: Respiratory Depth and Rhythm

Respiratory Depth
Respiratory depth measures the volume of air inhaled or exhaled during a breath. It can vary from shallow to deep and typically remains consistent when a person is at rest or asleep. Occasionally, individuals will automatically inhale deeply, known as sighing, which inflates the lungs with more air than normal breathing.
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Assessment of Ventilation I: Respiratory Rate

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Physiological Control of Respiration01:23

Physiological Control of Respiration

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A Wind Tunnel for Odor Mediated Insect Behavioural Assays
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Odour, covering and ventilation.

D Sivil1, J A Hobson

  • 1WRc, Frankland Road, Blagrove, Swindon, Wiltshire SN5 8YF, UK. david.sivil@wrcplc.co.uk

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|April 22, 2009
PubMed
Summary
This summary is machine-generated.

A new technique precisely measures air leakage rates (L(0)) in enclosures using sulfur hexafluoride (SF(6)) decay. This method offers a more accurate assessment than traditional extraction rate measurements, revealing short air residence times in many enclosures.

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Area of Science:

  • Environmental Engineering
  • Air Quality Monitoring
  • Mass Transfer

Background:

  • Enclosure air leakage is critical for indoor air quality and contaminant control.
  • Traditional methods for measuring air exchange rates can be imprecise.
  • Understanding emission rates and concentrations is vital for managing enclosed environments.

Purpose of the Study:

  • To introduce a precise method for measuring enclosure air leakage rates (L(0)) using SF(6) decay.
  • To develop relationships between air extraction rates, concentration, and emission rates for enclosed odour sources.
  • To identify critical flow rates (Q(50)) for optimizing ventilation and minimizing contaminant exposure.

Main Methods:

  • Utilized sulfur hexafluoride (SF(6)) decay to determine L(0), the leakage rate without air extraction.
  • Developed mass transfer models relating extraction rate to concentration and emission rate for odorous compounds.
  • Defined and analyzed the critical flow rate Q(50) at which emission and concentration are 50% of maximum.

Main Results:

  • The SF(6) decay method proved more precise for measuring L(0) than extraction-based methods.
  • Three of four studied enclosures exhibited L(0) values indicating air residence times under one hour.
  • Relationships were established to assess the impact of reduced extraction rates on contaminant concentrations and odour levels.

Conclusions:

  • The SF(6) decay technique provides a highly accurate measure of enclosure air leakage.
  • Optimizing extraction rates requires considering specific contaminants (e.g., H(2)S) and odour, as critical flow rates (Q(50)) vary.
  • Ventilation strategies should account for the differential impact of extraction rates on various airborne species and odour.