Basic Principles and Calculations in Chemical Engineering

Chapter 11. Humidity (Psychrometric) Charts and Their Use

11.1 Terminology

11.2 The Humidity (Psychrometric) Chart

11.3 Applications of the Humidity Chart

Your objectives in studying this chapter are to be able to

1. Define and understand humidity, dry-bulb temperature, wet-bulb temperature, humidity chart, moist volume, and adiabatic cooling line

2. Use the humidity chart to determine the properties of moist air

3. Calculate enthalpy changes and solve heating and cooling problems involving moist air

Looking Ahead

As you know, air is a mixture of various gases of constant composition plus water vapor in amounts that vary from time to time and place to place. What we will do in this chapter, after first presenting some new terminology, is discuss ...