Wet Bulb Calculator
To find the temperature of the wet bulb, you need to provide temperature, relative humidity in the calculator's input fields, and click on the calculate button. Our free Wet Bulb Calculator produces the wet bulb temperature instantly.
Ex: 10, 167, 48, 34.5 or 90
Wet Bulb Calculator: Make use of our free Wet Bulb Calculator tool to obtain the wet bulb temperature exact value along with the detailed steps. You can find the step by step process to compute the wet bulb temperature manually in the following sections. Get the solved example questions, formulas and useful information related to the wet bulb.
Steps to Compute Wet Bulb Temperature
The following are the steps on how to find the wet bulb temperature easily.
- Get the temperature and relative humidity from the question.
- Know the formula to compute the temperature of the wet bulb.
- Substitute the given values in the formula.
- Perform all the required math operations to get the wet bulb temperature value.
What is Wet Bulb Temperature?
Wet bulb is the lowest temperature in air can reach only through evaporation.The wet bulb temperature is the lowest temperature a potion of air can acquire by evaporative cooling only. The wet bulb temperature becomes the noraml temperature only when the air humidity is 100%. As the humidity in the air decreases, the wet bulb temperature will be lesser than the normal temperature.
The formula to calculate the wet bulb temperature is along the lines.
Tw = T * arctan[0.151977 * (rh% + 8.313659)^(1/2)] + arctan(T + rh%) - arctan(rh% - 1.676331) + 0.00391838 *(rh%)^(3/2) * arctan(0.023101 * rh%) - 4.686035
Where,
Tw is the wet bulb temperature
T is the air temperature which can be measured using a thermometer
rh% is the relative humidity. It is the ratio of amount of water vapor in the air to the amount of water in the given temperature
Wet Bulb Globe Temperature:It is a type of apparent temperature. Wet-bulb globe temperature is used to estimate the effect of humidity, temperature, sun light and wind speed on humans. The wet bolb globe temperature equation is follows:
WBGT = 0.7 * Tw + 0.2 * Tg + 0.1 * T
Where
Tg is the globe thermometer tempearture
Another formula is WBGT = 0.7 * Tw + 0.3 * T
Example
Question: If the ambient temperature is 25°C and a relative humidity is 40%, then find wet bulb temperature?
Solution:
Given that
Temperature T = 25°C
Relative humidity rh = 40%
The wet-bulb tenmperature formula is
Tw = T * arctan[0.151977 * (rh% + 8.313659)^(1/2)] + arctan(T + rh%) - arctan(rh% - 1.676331) + 0.00391838 *(rh%)^(3/2) * arctan(0.023101 * rh%) - 4.686035
Tw = 25 * arctan[0.151977 * (40 + 8.313659)^(1/2)] + arctan(25 + 40) - arctan(40 - 1.676331) + 0.00391838 *(40)^(3/2) * arctan(0.023101 * 40) - 4.686035
= 25 * arctan[0.151977 * 6.95080] + arctan(65) - arctan(38.323669) + 0.99128 * arctan(0.92404) - 4.686035
= 16.384°C
Therefore, the wet bulb calculator is 16.374°C.
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FAQs on Wet Bulb Calculator
1. How to measure the wet-bulb temperature?
At first measure the normal temperature in the air with a thermometer. Find the relative humidity and substitute these values in the temperature of the wet-bulb formula. Perform the math operations to get the temperature value.
2. What are the applications of the wet-bulb calculator?
The wet bulb temperature is used in construction fields to test the humidities and temperatures of different materials, in snowmaking, and meteorology.
3. What is the difference between dry-bulb temperature and wet bulb temperature?
The wet bulb temperature is the temperature of adiabatic saturation. While dry bulb temperature is the normal air temperature. Wet bulb temperature can be measured by using a thermometer with a bulb wrapped in wet muslin and dry bulb temperature can be measured using a thermometer freely exposed to the air.
4. What is the formula to calculate the wet bulb temperature?
The most important formula to compute the wet bulb temperature is Tw = T * arctan[0.151977 * (rh% + 8.313659)^(1/2)] + arctan(T + rh%) - arctan(rh% - 1.676331) + 0.00391838 *(rh%)^(3/2) * arctan(0.023101 * rh%) - 4.686035. Here rh is the relative humidity and T is the temperature.