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Globe Temperature and Its Measurement: Requirements and Limitations
A Virgílio M Oliveira1,2, António M Raimundo1, Adélio R Gaspar1
1ADAI, LAETA, Department of Mechanical Engineering, University of Coimbra, Pólo II, Coimbra, Portugal.
Annals of Work Exposures and Health
|June 20, 2019
Summary
Globe temperature measurements reveal that standard response times are often too short, requiring longer observation periods. Sensor diameter and air velocity significantly impact readings, necessitating correction equations for accurate thermal environment assessment.
Area of Science:
- Environmental Science
- Thermal Physics
- Metrology
Background:
- Accurate globe temperature measurement is crucial for assessing thermal environments.
- Existing literature may underestimate required measurement durations and overlook key influencing factors.
Purpose of the Study:
- To investigate the response times of globe thermometers.
- To evaluate the influence of globe diameter and air velocity on temperature measurements.
- To propose correction equations for standard globe temperature.
Main Methods:
- Utilized two globe thermometers (50 mm and 150 mm diameters).
- Conducted tests under various thermal environmental conditions, including different air velocities.
- Analyzed response times, diameter effects, and air velocity impacts.
Main Results:
- Response times exceeding 30 minutes were observed in 68% of tests, questioning literature values.
- Differences greater than 20°C were recorded between the 50 mm and 150 mm sensors.
- Air velocity variations caused mean relative differences exceeding 30%.
Conclusions:
- Standard measurement periods for globe thermometers may be insufficient.
- Globe diameter significantly affects temperature readings, with smaller globes showing greater sensitivity.
- Correction equations based on 50 mm globe measurements are proposed for natural and forced convection scenarios.
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