2.1. Key Psychrometric Properties

Try these first

1. 1.

   Define Dry Bulb Temperature.

   Hint

   Think about what a regular thermometer shows.

2. 2.

   What does the Wet Bulb Temperature indicate?

   Hint

   Consider how moisture affects temperature readings.

3. 3.

   What is Dry Bulb Temperature?

   • A measure of humidity
   • The air temperature
   • The heat content of air

   Hint

   It's what you would read on a thermometer.

4. 4.

   True or False: Wet Bulb Temperature is only influenced by the ambient temperature.

   • True
   • False

   Hint

   Consider what happens when water evaporates in the air.

5. 5.

   An air-conditioning system has a DBT of 30°C and a WBT of 24°C. Calculate the relative humidity if the saturation pressure at 30°C is 4.24 kPa.

   Hint

   Use the saturation pressure values to find the ratio.

6. 6.

   If the enthalpy of air at 35°C DBT and 20°C WBT is 95 kJ/kg, determine how this informs cooling strategies in a building.

   Hint

   Consider how high enthalpy impacts cooling load calculations.