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The major parameters affecting temperature inside inhalation chambers

D M Bernstein, R T Drew

    American Industrial Hygiene Association Journal
    |June 1, 1980
    PubMed
    Summary
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    Maintaining consistent inhalation chamber temperature is crucial for accurate animal study results. This study investigated heat transfer in a 380 L chamber, finding stainless steel walls effectively regulate temperature during animal exposures.

    Area of Science:

    • Environmental toxicology
    • Laboratory animal science
    • Thermal engineering

    Background:

    • Inhalation chamber temperature fluctuations impact animal physiology, xenobiotic metabolism, and aerosol interactions.
    • Uniform temperature control is critical for reproducible results in inhalation toxicology studies.
    • Understanding heat transfer mechanisms within chambers is essential for experimental design.

    Purpose of the Study:

    • To investigate heat transfer mechanisms in a 380 L inhalation chamber.
    • To evaluate methods for maintaining uniform chamber temperatures during animal exposures.
    • To quantify the thermal characteristics of the chamber and its components.

    Main Methods:

    • Utilized an array of 40 thermocouples to map temperature profiles within the chamber.

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  • Conducted experiments with and without animal subjects (rats) and chamber insulation.
  • Measured temperature variations under different animal loadings and intake air temperatures.
  • Determined heat transfer coefficients and performed heat balance studies.

    • Main Results:

    • An effective heat transfer coefficient of 6.6 +/- 1.8 W/m2°C was determined for the stainless steel chamber walls.
    • Stainless steel walls effectively removed approximately 90% of animal-generated heat.
    • Chamber wall heat removal was significant compared to the airstream's capacity at 100 L/min intake flow rate.

    Conclusions:

    • The stainless steel construction of the inhalation chamber facilitates efficient heat removal.
    • Effective temperature regulation is achievable through the chamber's thermal properties and controlled airflow.
    • These findings support the development of standardized protocols for inhalation exposure studies.