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Sling Psychrometers
Sling Psychrometers
Temperature (T) is measured by the dry bulb thermometer.
Wet-bulb temperature (Tw) is measured by the wet-bulb thermometer.
Water will evaporate from the wick, cooling the bulb through latent heat absorption
Reminder: evaporation is a cooling process, meaning it’s cooling its environment – in this case, the thermometer!
Wet-Bulb Temperature (Tw) vs. Dew-Point Temperature (Td)
Wet-Bulb Temperature (Tw) vs. Dew-Point Temperature (Td)
Tw is not the same as Td
Tw is measuring how much water you need to evaporate into the air to get saturation.
Td is measuring how much water content you already have in the air.
Your body is a wet bulb!
Your body is a wet bulb!
High Humidity: Low evaporation rate -> High wet bulb temp
Low Humidity: High evaporation rate -> Low wet bulb temp
How to Use a Sling Psychrometer
How to Use a Sling Psychrometer
Wet the cloth wick on the end of a sling psychrometer
Swing the psychrometer for about 2 minutes.
Swing the psychrometer AWAY FROM YOUR HEAD and AWAY FROM OTHERS AND OBJECTS
Record the dry and wet-bulb temperature every 30 seconds.
Sling-Psychrometers.movWatch this video detailing the proper use of a sling psychrometer, and how to read the wet/dry-bulb temperatures
Watch this video detailing the proper use of a sling psychrometer, and how to read the wet/dry-bulb temperatures
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