Psychrometric Conditions of the Classroom

Objective

To determine the psychrometric conditions of the classroom.

Outcome

Students will develop a deep understanding of psychrometric principles and variables in the psychrometric chart.

Requirements

Sling psychrometer, psychrometric chart.

Prerequisites

1. Conceptual knowledge of psychrometry.
2. Understanding of psychrometric chart.
3. Knowledge of how to use a sling psychrometer.

Procedure

Write down what you ‘feel’ is the temperature and humidity of the classroom. By the end of the readings compare with the actual and understand the difference

Step 1: Wet the sock of the sling psychrometer with water.

Step 2: Swing the psychrometer for 30 seconds.

Step 3: Note the dry-bulb and wet-bulb temperatures of the classroom.

Step 4: Plot these values on the psychrometric chart.

Step 5: Find out the remaining parameters on the psychrometric chart, which are

1. Humidity ratio
2. Relative humidity
3. Enthalpy
4. Specific Volume 
5. Dew Point Temperature

Step 6: Tabulate the results as follows:

Table:

Parameter	Unit	Value
Dry Bulb Temperature	℃
Wet Bulb Temperature	℃
Humidity Ratio	g of humidity/kg of dry air
Relative Humidity	%
Enthalpy	kJ/kg
Specific Volume	m3/kg
Dew Point Temperature	℃

Image:

Psychrometric Chart

References

None

Source of Idea