Measurement of outdoor and recirculated air percentages by carbon dioxide tracer

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      <subfield code="a">Olcerst, Robert</subfield>
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      <subfield code="c">Robert Olcerst</subfield>
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      <subfield code="a">This article presents a technique to extend the utility of carbon dioxide dataloggers, such as the Metrosonic Aq-501, to provide information on the percentages of both outside aire and recirculated air in a ventilated compartment. An electronic timed sampling valve is used to alternately collect air from the room supply and from the recirculating airstream. The timed valve provides a dataset for each location that can be used to calculate the percentages of outside and recirculated air. The technique uses ambient carbon dioxide as a natural tracer gas. The carbon dioxide tracer technique can be used when the psychometric temperature method for calculating outside air percentage is indeterminate because the return air and outdoor air temperatures are equal</subfield>
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      <subfield code="a">Contaminantes químicos</subfield>
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      <subfield code="0">MAPA20080584740</subfield>
      <subfield code="a">Dióxido de carbono</subfield>
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      <subfield code="a">Contaminación atmosférica</subfield>
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      <subfield code="a">Ventilación</subfield>
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      <subfield code="a">American Industrial Hygiene Association journal</subfield>
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      <subfield code="t">American Industrial Hygiene Association journal</subfield>
      <subfield code="d">Fairfax, Virginia</subfield>
      <subfield code="g">Vol. 55, nº 6, June 1994 ; p. 525-528</subfield>
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