Practical Heat Stress Calculator

Formula

The formula to calculate the Practical Heat Stress (PHS) is:

\[ PHS = (0.7 \cdot WBGT) + (0.2 \cdot DBT) + (0.1 \cdot NWBT) \]

Where:

(PHS) is the Practical Heat Stress
(WBGT) is the Wet Bulb Globe Temperature
(DBT) is the Dry Bulb Temperature
(NWBT) is the Natural Wet Bulb Temperature

What is Practical Heat Stress?

Practical Heat Stress is a measure used to evaluate the combined effect of temperature, humidity, and solar radiation on the human body. It is an important factor in assessing the risk of heat-related illnesses, especially in environments where individuals are exposed to high temperatures and humidity. The Practical Heat Stress index helps in determining the necessary precautions and measures to ensure the safety and well-being of individuals working or engaging in activities in hot conditions.

Example Calculation

Let's assume the following values:

Wet Bulb Globe Temperature (WBGT) = 30 °C
Dry Bulb Temperature (DBT) = 35 °C
Natural Wet Bulb Temperature (NWBT) = 28 °C

Using the formula:

\[ PHS = (0.7 \cdot 30) + (0.2 \cdot 35) + (0.1 \cdot 28) = 21 + 7 + 2.8 = 30.8 \]

The Practical Heat Stress (PHS) is 30.8.