6. Psychrometric or Air-Conditioning Processes

Try these first

1. 1.

   What is dry bulb temperature?

   Hint

   Think of a standard thermometer reading.

2. 2.

   What does relative humidity indicate?

   Hint

   Consider how humidity feels on a hot day.

3. 3.

   What is the primary purpose of comfort air-conditioning?

   • Maintain cool temperature
   • Control indoor air quality
   • Ensure suitable temperature and humidity

   Hint

   Consider what makes you feel comfortable indoors.

4. 4.

   True or False: Dehumidification always increases temperature.

   • True
   • False

   Hint

   Think about how AC units often work.

5. 5.

   Calculate the energy required to cool air from a DBT of 30°C to 20°C, considering a mass flow rate of 100 kg/h.

   Hint

   Refer to your psychrometric chart for values.

6. 6.

   Analyze a scenario where you have mixed two different air streams with distinct temperatures and humidities. How would you represent this on a psychrometric chart?

   Hint

   Understand the linear mixing rule of air streams.