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Psychrometer

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Psychrometer

  1. 1. A Sling PsychrometerA Sling Psychrometer is used to measureis used to measure relative humidity.relative humidity. Get yours today!Get yours today!
  2. 2. Psychrometer Parts:Psychrometer Parts: •Dry Bulb ThermometerDry Bulb Thermometer •Wet Bulb ThermometerWet Bulb Thermometer •Reservoir and StockingReservoir and Stocking DRYDRYWETWET
  3. 3. But why do we sling itBut why do we sling it aroundaround andand around?around?
  4. 4. What happens to your skin when youWhat happens to your skin when you sweat and then stand in a breeze?sweat and then stand in a breeze?
  5. 5. As the wet-bulb themometer goes through the airAs the wet-bulb themometer goes through the air 1. Water1. Water evaporatesevaporates 2. Energy is2. Energy is used; waterused; water changeschanges from liquid tofrom liquid to vaporvapor 3. Wet-bulb temperature goes down3. Wet-bulb temperature goes down
  6. 6. What influences howWhat influences how much the wet-bulbmuch the wet-bulb temperature goestemperature goes down?down? HumidityHumidity TemperatureTemperature
  7. 7. Using our wet- andUsing our wet- and dry-bulb temperatures,dry-bulb temperatures, we can consult tableswe can consult tables made by scientists…made by scientists… ……to determineto determine humidityhumidity andand saturation valuesaturation value..
  8. 8. Now we can calculate relative humidity!Now we can calculate relative humidity!
  9. 9. Partial Relative Humidity Chart for 30° CPartial Relative Humidity Chart for 30° C Difference Between Dry Bulb and Wet Bulb Temperatures Relative Humidity None 100% 0.5° 96% 1.0° 93% 1.5° 89% 9.0° 44% 9.5° 42% 14.5° 19% 15.0° 17% 18.0° 5% Fortunately, we don’t have to do all this every time…Fortunately, we don’t have to do all this every time…
  10. 10. On the side of the psychrometer isOn the side of the psychrometer is a sliding scale which calculatesa sliding scale which calculates relative humidity for us.relative humidity for us. Align the dry-bulb reading with theAlign the dry-bulb reading with the wet-bulb reading. The arrow will pointwet-bulb reading. The arrow will point to the relative humidity reading on theto the relative humidity reading on the center scale. It’s easy!center scale. It’s easy!

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