Accession Number:

AD0753843

Title:

Physiological Effects of Low Ventilation Rates, High Temperatures and High Humidities

Descriptive Note:

Final rept.

Corporate Author:

SANTA CLARA UNIV CA DEPT OF MECHANICAL ENGINEERING

Personal Author(s):

• Pefley, Richard K.
• Abel, Joseph F.
• Dutton, John S.

Report Date:

1972-06-01

Pagination or Media Count:

79.0

Abstract:

Through the use of a predictive model and experimentation in a calorimeter, the temperatures and humidities which represent equal comfort states to the human for minimal ventilation rates in a neutral thermal radiation environment are established. This is accomplished by establishing from experimental data a relationship between the subjects skin temperature and the per cent of sweat glands that are activated. Points on the resulting curve are defined as values on the Physiological Thermal Index. They are used in conjunction with experimentally obtained heat and mass transfer coefficients to place lines on the psychrometric charts which represent constant values of this index. The effects of variations in air flow rate, and metabolic output, are presented. The evidence to date indicates that the predictive model is sound and that the Physiological Thermal Index affords a new and clearer way to view the interaction between man and his thermal environment.

Descriptors:

• *HIGH TEMPERATURE
• *STRESS(PHYSIOLOGY)
• *VENTILATION
• *HUMIDITY
• HEAT TRANSFER
• CALORIMETRY
• HEAT PRODUCTION(BIOLOGY)
• SWEAT GLANDS
• HEAT TOLERANCE
• CONFINED ENVIRONMENTS
• BODY TEMPERATURE
• SKIN(ANATOMY)
• METABOLISM
• SHELTERS
• CIVIL DEFENSE

Subject Categories:

• Stress Physiology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE