Calculate Wet Bulb Temperature from Dry Bulb

Wet Bulb Temperature Formula:

\[ T_w = T_d - ((T_d - T_{w\_approx}) \times (1 - RH/100)) \]

Dry Bulb Temperature (T_d):

°C

Relative Humidity (RH):

Initial Approximation (T_w_approx):

°C

Wet Bulb Temperature (T_w):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is Wet Bulb Temperature?

Definition: Wet bulb temperature is the lowest temperature that can be reached by evaporating water into the air at constant pressure.

Purpose: It's important in meteorology, HVAC design, and industrial processes as it indicates the cooling potential through evaporation.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ T_w = T_d - ((T_d - T_{w\_approx}) \times (1 - RH/100)) \]

Where:

\( T_w \) — Wet bulb temperature (°C)
\( T_d \) — Dry bulb temperature (°C)
\( RH \) — Relative humidity (%)
\( T_{w\_approx} \) — Initial approximation of wet bulb temperature (°C)

Explanation: The formula estimates the wet bulb temperature based on the dry bulb temperature, relative humidity, and an initial approximation.

3. Importance of Wet Bulb Temperature

Details: Wet bulb temperature is crucial for understanding human comfort, predicting frost formation, designing cooling systems, and assessing heat stress conditions.

4. Using the Calculator

Tips: Enter the dry bulb temperature, relative humidity (0-100%), and an initial approximation of the wet bulb temperature. All values must be valid (RH between 0 and 100).

5. Frequently Asked Questions (FAQ)

Q1: What's a typical initial approximation for wet bulb temperature?
A: For most conditions, you can use the dew point temperature or simply start with a value 5-10°C lower than the dry bulb temperature.

Q2: How accurate is this calculation?
A: This is an approximation. For precise measurements, use a psychrometric chart or more complex empirical formulas.

Q3: What's the relationship between wet bulb and dew point?
A: Wet bulb temperature is always between the dry bulb temperature and dew point. At 100% RH, all three are equal.

Q4: Why is wet bulb temperature important for human health?
A: It indicates how effectively sweating can cool the body. High wet bulb temperatures (above 35°C) can be dangerous as they impair the body's ability to cool itself.

Q5: Can this formula be used for temperatures below freezing?
A: Yes, but the interpretation changes as it would represent the temperature to which water would freeze by evaporation.