Resultant Globe Temperature

Overview

Engineering reference data for Resultant Globe Temperature in thermodynamics.

Key Formulas

First Law

$\Delta U = Q - W$

Energy is conserved — heat added minus work done.

Ideal Gas Law

$PV = nRT$

Relates pressure, volume, and temperature of an ideal gas.

Heat Transfer

$Q = mc\Delta T$

Sensible heat transfer.

Carnot Efficiency

$\eta = 1 - T_C/T_H$

Maximum efficiency between two temperatures.

Variables

Formula Explanation

The globe temperature ($t_g$) provides a more holistic measure of thermal comfort than air temperature alone because it accounts for both convective and radiative heat transfer to a human-sized surface.

Measurement and Application

Globe temperatures are practically measured using a blackened hollow sphere (a globe thermometer) with a temperature sensor at its center.

• Recommended Globe Diameter: 25 mm to 150 mm (0.98 in to 5.9 in).
• Interpretation: The measured globe temperature approximates the resultant temperature and is a key component in calculating indices like the Wet Bulb Globe Temperature (WBGT) for assessing environmental heat stress.

References

• Original Source