Podcast
Questions and Answers
What does the temperature represent on a psychrometric chart?
What does the temperature represent on a psychrometric chart?
- Dew point
- Vertical axis
- Horizontal axis (correct)
- CDE curve
What does the CDE curve on a psychrometric chart represent?
What does the CDE curve on a psychrometric chart represent?
- Point A
- Point F
- Saturation humidity (correct)
- Dew point
At what point on a psychrometric chart is the air completely saturated with moisture?
At what point on a psychrometric chart is the air completely saturated with moisture?
- Dew point C (correct)
- Point E
- Point A
- Point F
What does point A (81°F) on a psychrometric chart represent?
What does point A (81°F) on a psychrometric chart represent?
What does the FCA dotted line on a psychrometric chart represent?
What does the FCA dotted line on a psychrometric chart represent?
What does the dew point represent on a psychrometric chart?
What does the dew point represent on a psychrometric chart?
What does the relative saturation (percent relative humidity) represent?
What does the relative saturation (percent relative humidity) represent?
Which of the following is true about the GK curve with 50% relative humidity?
Which of the following is true about the GK curve with 50% relative humidity?
What happens when air at point A (81°F) is used to dry a wet material?
What happens when air at point A (81°F) is used to dry a wet material?
What is the definition of wet-bulb temperature?
What is the definition of wet-bulb temperature?
How is the wet-bulb temperature measured?
How is the wet-bulb temperature measured?
What is the purpose of measuring the dry-bulb temperature?
What is the purpose of measuring the dry-bulb temperature?
Study Notes
Psychrometric Chart
- Represents the relationship between temperature and humidity of air-water vapor system at constant pressure
- Temperature is on the horizontal axis, and absolute humidity (weight of water vapor per unit weight of dry air) is on the vertical axis
Saturation Humidity (CDE Curve)
- Represents the saturation humidity at which partial pressure of water vapor = vapor pressure of free water at the same temperature
- Air is completely saturated with moisture (100% relative humidity) and humidity doesn't change when in contact with liquid water at the same temperature
Dew Point
- Temperature at which air-water vapor mixture becomes saturated (maximum amount of moisture without condensation)
- Cooling below dew point causes water vapor to condense into a two-phase system of saturated air and droplets of free water
Relative Saturation (RH)
- Represents the ratio of partial pressure of water vapor in air to vapor pressure of free water at the same temperature
- Can be calculated by dividing absolute humidity (FCA) by saturation humidity (CDE) at the same temperature
Wet-Bulb Temperature
- Occurs when air is used to dry a wet material, leading to evaporation of liquid and cooling of the surface
- Measured by a thermometer with a bulb covered by a wick saturated with water
- Represents the equilibrium of heat transfer between air and liquid, with heat transferred from air to liquid at a rate proportional to the temperature difference
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Description
Test your knowledge on the psychrometric chart which shows the relationship between temperature and humidity in an air-water vapor system at constant pressure. Learn about the CDE curve representing saturation humidity and its significance in determining air conditions.
