2. Psychrometry of Air-Conditioning Systems

Try these first

1. 1.

   What is the dry bulb temperature?

   Hint

   Think of a standard thermometer reading.

2. 2.

   What does WBT stand for?

   Hint

   Consider evaporation effects.

3. 3.

   What is relative humidity?

   • The amount of moisture in the air compared to the air temperature.
   • The amount of moisture in the air compared to the saturation level.
   • The temperature at which air condenses.

   Hint

   Think about saturation limits.

4. 4.

   True or False: The dew point represents the temperature at which condensation occurs.

   • True
   • False

   Hint

   Think about everyday experiences with moisture.

5. 5.

   Given a dry bulb temperature of 30°C and a wet bulb temperature of 25°C, calculate the relative humidity.

   Hint

   Look for standard psychrometric charts for support.

6. 6.

   In an HVAC system, when air with a humidity ratio of 0.01 kg/kg passes through a cooling coil dropping to a dew point of 15°C, describe the changes occurring in the air.

   Hint

   Use the concepts discussed about cooling and dehumidification processes.