The 2012 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 in selecting and using equipment. An accompanying CD-ROM contains all the volume's chapters in both I-P and SI units.
This edition includes a new Chapter 18, Variable-Refrigerant-Flow Systems, which describes these systems, their components, and applicable standards in detail, and includes a system design example and important guidance on costs, controls, and safety.
Some of the volume's other revisions and additions are as follows:
- Chapter 5, In-Room Terminal Systems, was extensively revised for usability, and has updates for current practice and technology, including new sections on variable-refrigerant-flow (VRF) units and chilled beams.
- Chapter 8, Combustion Turbine Inlet Cooling, has a new section on indirect evaporative cooling, plus new figures showing psychrometric processes and capacity enhancement and costs.
- Chapter 9, Applied Heat Pump and Heat Recovery Systems, has a new section and figure on applying lead-chiller heat pump water heating.
- Chapter 10, Small Forced-Air Heating and Cooling Systems, has been revised for current practice, with new content and references on duct system efficiency.
- Chapter 12, District Heating and Cooling, updated throughout, has an extensive new section on economic comparisons, plus several new detailed examples.
- Chapter 17, Ultraviolet Lamp Systems, has new results from ASHRAE research project RP-1509 on degradation of materials irradiated by UVC energy.
- Chapter 19, Duct Construction, has a rewritten section on duct leakage, and new information on air dispersion systems and factory-built grease duct systems.
- Chapter 20, Room Air Distribution Equipment, has revised and expanded sections on chilled beams and fan-coils.
- Chapter 21, Fans, has added descriptions of types of fans and their applications; many upgraded figures; vibration categories, grades and limits; and a complete rewrite and update for the controls section.
- Chapter 22, Humidifiers, has updated figures, plus other new content on management systems, environmental conditions, residential steam and industrial high-pressure and gas-fired equipment.
- Chapter 25, Mechanical Dehumidifiers and Related Components, has new content on whole-house residential, natatorium, and industrial equipment.
- Chapter 26, Air-to-Air Energy Recovery Equipment, has new performance equations, plus new content on capacity control and on multiple-exchanger, liquid-desiccant, thermosiphon, and twin-tower systems.
- Chapter 29, Air Cleaners for Particulate Contaminants, was revised to reflect current editions of ASHRAE Standard 52.2 and Guideline 26.
- Chapter 32, Boilers, has an updated section on condensing boilers and expanded guidance on boiler selection.
- Chapter 37, Solar Energy Equipment, has new content on worldwide solar equipment use, colored collectors, seasonal storage, and photovoltaic (PV) performance and degradation.
- Chapter 40, Cooling Towers, has added content on hybrid cooling towers, variable-frequency drive (VFD) operation, and free cooling.
- Chapter 41, Evaporative Air Cooling Equipment, revised throughout, has new sections on sound attenuation and nonchemical water treatment.
- Chapter 44, Centrifugal Pumps, has been updated, with several new figures and a new section on differential pressure control with predefined control curves.
- Chapter 51, Thermal Storage, has new content on unitary thermal storage systems (UTSSs), two new detailed sizing examples, several new figures, and extensive new guidance on equipment selection and operation.
This volume is published, both as a bound print volume and in electronic format on a CD-ROM, in two editions: one using inch-pound (I-P) units of measurement, the other using the International System of Units (SI).
Corrections to the 2009, 2010, and 2011 Handbook volumes can be found on the ASHRAE Web site at http://www.ashrae.org and in the Additions and Corrections section of the 2012 volume. Corrections for the 2012 volume will be listed in subsequent volumes and on the ASHRAE Web site.
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Reader comments are enthusiastically invited. To suggest improvements for a chapter, please comment using the form on the ASHRAE Web site or write to Handbook Editor, ASHRAE, 1791 Tullie Circle, Atlanta, GA 30329, or fax 678-539-2187, or e-mail firstname.lastname@example.org.
Mark S. Owen