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SMACNA - HVAC SYS UND STD BASIC

HVAC SYSTEMS: UNDERSTANDING THE BASICS

active, Most Current
Organization: SMACNA
Publication Date: 1 July 2018
Status: active
Page Count: 265
scope:

OVERVIEW OF THIS MANUAL

Figure 1-1 provides a flow chart illustrating how this manual is structured and how the remaining nine chapters interrelate to one another. As can be seen from Figure 1-1, Chapter II starts with a discussion the properties of moist air that are controlled by HVAC systems to provide a comfortable thermal environment for building occupants. Chapter III builds on Chapter II by introducing the basics or HVAC systems, defining human comfort in terms of the properties of moist air and discussing how HVAC systems control the properties of moist air. Chapter III is also important because it addresses energy use by HVAC systems and the tradeoffs between human comfort and energy efficiency.

Unitary HVAC systems are covered next in Chapter IV because these systems are common in residential and light commercial buildings and will be familiar to readers. Unitary HVAC systems are also self-contained units that can be used to illustrate the mechanical refrigeration cycle as well as illustrate in physical terms Chapter III's HVAC block diagram elements. Central heating and cooling equipment are then covered in Chapters V and VI, respectively. These chapters follow Chapter III and draw parallels wherever possible between the familiar unitary HVAC equipment and central plant HVAC equipment to help the reader understand that basic system operation has not changed only the scale and heat transfer media.

Building on the central heating and cooling chapters, Chapter VII covers basic hydronic distribution systems and Chapter VIII covers basic air distribution systems in buildings including fan laws, fan operation, and the use of variable frequency drives. Chapter IX covers central HVAC as a system by bringing together previous four chapters that deal with central heating, central cooling, hydronic distribution, and air distribution as subsystems. In keeping with this manual's purpose of providing the basics of HVAC system operation, only variable-air-volume (VAV) systems are covered in Chapter VIII because these systems are the most common in today's commercial and institutional buildings. A detailed discussion of the other types of air distribution systems along with a comparison between them is left for SMACNA's HVAC Systems Applications Manual. Finally, Chapter X introduces HVAC system control system using the system perspective developed in Chapter IX.

There are several figures throughout the text to help illustrate the systems that are discussed. Some of the diagrams were created using AutoDesk AutoCAD software, while the more detailed equipment is shown using HVAC Solutions software. Also, at the end of each chapter are review questions to test your understanding of the concepts discussed in that particular chapter. The answers to these review questions are found in Appendix E.

Four appendices are also included in this manual. Appendix A provides a glossary of HVAC terms for reference. The outline of CSI's 2016 MasterFormatTM for Division 23/HVAC is provided in Appendix B. HVAC references and resources published by SMACNA are contained in Appendix C. Photos of various equipment and components are provided in Appendix D. And finally, the answers to the chapter review questions are contained in Appendix E

Document History

HVAC SYS UND STD BASIC
July 1, 2018
HVAC SYSTEMS: UNDERSTANDING THE BASICS
OVERVIEW OF THIS MANUAL Figure 1-1 provides a flow chart illustrating how this manual is structured and how the remaining nine chapters interrelate to one another. As can be seen from Figure 1-1,...

References

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