Basic Principles and Calculations in Chemical Engineering, 9th Edition

Chapter 10Humidity (Psychrometric) Charts

10.1 Terminology

10.2 The Humidity (Psychrometric) Chart

10.3 Applications of the Humidity Chart

Chapter Objectives

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

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

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

Introduction

Cooling towers are the method of choice for removing excess thermal energy for large-scale processing systems. Cooling towers contact the heated water with ambient air, evaporating a portion of the hot water into the air and thus cooling the water. The cooling water is then used throughout ...