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Description 2020 ASHRAE Handbook—HVAC Systems and Equipment

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Table of Contents, 2020 ASHRAE Handbook—HVAC Systems and Equipment


The 2020 ASHRAE Handbook—HVAC Systems and Equipment discusses various systems and the equipment (components or assemblies) they comprise, and describes features and differences. This information helps system designers and operators to select and use equipment that is the best fit for a particular application or scenario. Subject matter experts on ASHRAE Technical Committees in each subject area have reviewed all chapters and revised them as needed for current technology and practice.

New! The Handbook PDF download is now annotatable! Users can highlight relevant text and add their own notes and comments.

Some of the volume’s revisions and additions are as follows:

  • Chapter 9, Applied Heat Pump and Heat Recovery Systems, has new content on waste heat recovery, district applications, and industrial process heat pumps.
  • Chapter 18, Variable Refrigerant Flow, has new sections on modeling and system commissioning, and an updated system design example.
  • Chapter 19, Duct Construction, has extensive revisions on system leakage and air dispersion systems.
  • Chapter 20, Room Air Distribution Equipment, has updates for current technology, with new information on specialized components and air curtains.
  • Chapter 24, Desiccant Dehumidification and Pressure‑Drying Equipment, has expanded content on applications, air filters, and liquid strainers, plus recommendations from ASHRAE research project RP-1339 on rating equipment at altitude.
  • Chapter 25, Mechanical Dehumidifiers and Related Components, has new content on psychrometrics, outdoor air, controls, and industrial dehumidifiers.
  • Chapter 26, Air-to-Air Energy Recovery Equipment, has new information on heat pipes and desiccant and heat wheel systems.
  • Chapter 28, Unit Ventilators, Unit Heaters, and Makeup Air Units, has revisions on standards, controls, and fan selection for makeup air units.
  • Chapter 29, Air Cleaners for Particulate Contaminants, has updates on standards and performance testing.
  • Chapter 31, Automatic Fuel-Burning Systems, has added content on pneumatically and electronically linked gas/air ratio burner systems.
  • Chapter 37, Solar Energy Equipment, has new data on worldwide solar technology use, plus an expanded section on photovoltaic equipment.
  • Chapter 38, Compressors, has revisions on general theory; screw and scroll compressors; and bearings, including oil-free technologies.
  • Chapter 44, Centrifugal Pumps, has new content on vertical, inline, split-coupled pumps; hydronic system pump selection; and differential pressure control.
  • Chapter 47, Valves, has new content on control valve sizing; electronic actuators; and ball, butterfly, flow-limiting, and pressure-independent control valves.
  • Chapter 50, Room Air Conditioners and Packaged Terminal Air Conditioners, has updates for efficiency standards.
  • Chapter 52, Dedicated Outdoor Air Systems, is a completely new chapter focusing on DOAS equipment.

This volume is published as a bound print volume, as a downloadable PDF, and online, and in two editions: one using inch-pound (I-P) units of measurement, the other using the International System of Units (SI).

Corrections for this volume will be listed in subsequent volumes and on the ASHRAE website.

Reader comments are enthusiastically invited. To suggest improvements for a chapter, please comment using the form on the ASHRAE website or write to Handbook Editor, ASHRAE, 1791 Tullie Circle, Atlanta, GA 30329, or fax 678-539-2187, or e-mail hkennedy@ashrae.org.

Heather E. Kennedy
Editor

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