Practical psychrometry (KS20)

Mike Farrell Gay Lawrence Race

• Publisher: The Chartered Institution of Building Services Engineers
• Year: 2012
• eBook ISBN: 9781906846268
• Topic: Technology & Engineering
• Subtopic: Construction & Architectural Engineering
• Index: Technology & Engineering

Our atmosphere, the air all around us, is something that we take for granted. We expect it to contain adequate oxygen, to be clean and fresh, and provide us with a comfortable environment; yet in many situations the air will need to be treated, cleaned, heated or cooled to provide the required comfort conditions within buildings. Knowledge of the properties and behaviour of air is therefore essential for those involved in achieving comfortable environments for occupants and in designing and operating the systems that help to realise this, such as air conditioning.This publication provides a practical introduction to psychrometry for engineers, students and anyone who wants an insight into the subject. It is not intended to provide a comprehensive theoretical approach to psychrometry but to give the newcomer to the topic enough information to understand how the psychrometric chart is constructed and how the information it provides can be used. It will show how psychrometry, the psychrometric chart and psychrometric processes are used in the practice of building services engineering.The nature of atmospheric air and its properties is examined, together with the quantities by which it is measured and the processes by which it can be modified. The parameters commonly used to provide specifications for designs, and for measuring air conditions are considered. Having explained the construction of the psychrometric chart the various psychrometric processes and the equipment used to provide them are explored. These include the changes which air undergoes as it passes through an occupied space and the engineered processes such as heating, cooling, humidification, dehumidification and mixing.With the basics and processes covered there is a brief overview explaining how the natural external environment can be transformed into a controlled internal environment by using items of equipment that can vary the temperature and humidity of air within air conditioning systems. This section is limited to describing some typical examples of sample systems.It is intended that the reader should understand the basic operation of the systems but it does not address the design process in detail. The publication assumes knowledge of the general Gas Laws and some basic scientific notation and symbols. This information can be found in a number of general science publications as well as the ones given in the bibliography.

Table of contents

• KS20 Practical psychrometry OFC
• Contents
• Symbols and units
• Part 1: Psychrometry and the psychrometric chart
• 1 Introduction
• 2 Psychrometric fundamentals
• 3 The psychrometric chart
• Part 2: Using the psychrometric chart in practice
• 4 Design conditions
• 5 Psychrometric processes
• 6 Applied psychrometry
• 7 Further reading