1. What is Wet Bulb Temperature?

Wet bulb temperature is the lowest temperature that can be reached by evaporating water into the air at constant pressure. It represents the temperature read by a thermometer covered in water-soaked cloth over which air is passed.

2. How Does the Calculator Work?

The calculator uses Stull's approximation formula:

Where:

• \( T_w \) — Wet bulb temperature (°C)
• \( T \) — Dry bulb temperature (°C)
• \( RH \) — Relative humidity (%)

Explanation: This empirical formula provides a good approximation of wet bulb temperature without requiring psychrometric charts.

3. Importance of Wet Bulb Temperature

Details: Wet bulb temperature is crucial for assessing human comfort, heat stress, industrial processes, and meteorological applications. It's particularly important for evaluating dangerous heat conditions where evaporative cooling is limited.

4. Using the Calculator

Tips: Enter dry bulb temperature in °C and relative humidity in percentage (0-100%). The calculator works best for temperatures between -50°C and 60°C.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between dry bulb and wet bulb temperature?
A: Dry bulb measures actual air temperature, while wet bulb measures the temperature after evaporative cooling. The difference indicates humidity levels.

Q2: Why is wet bulb temperature important for human health?
A: High wet bulb temperatures indicate conditions where sweating becomes ineffective for cooling, potentially leading to heat-related illnesses.

Q3: What is a dangerous wet bulb temperature?
A: Wet bulb temperatures above 35°C are considered extremely dangerous as they approach the limit of human survivability.

Q4: How accurate is this calculation method?
A: Stull's approximation is generally accurate to within ±0.5°C for most environmental conditions.

Q5: Can I use this for HVAC system design?
A: While useful for estimation, professional HVAC design should use more precise psychrometric calculations and charts.