By ASHRAE

ISBN-10: 1621980367

ISBN-13: 9781621980360

This instruction manual discusses a variety of platforms and the apparatus (components or assemblies) they contain, and describes positive aspects and adjustments. this data is helping procedure designers and operators in opting for and utilizing gear. This version encompasses a new bankruptcy 18, Variable-Refrigerant-Flow structures, which describes those platforms, their parts, and acceptable criteria intimately, and incorporates a process layout instance and critical tips on bills, controls, and security. This instruction manual is a reference for engineers operating in HVAC&R and for pros in allied fields. ASHRAE, based in 1894, is a global association of a few 50,000 individuals. ASHRAE fulfills its project of advancing heating, air flow, air con, and refrigeration to serve humanity and advertise a sustainable global via examine, criteria writing, publishing, and carrying on with schooling.

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Additional resources for 2012 ASHRAE Handbook - Heating, Ventilating, and Air-Conditioning Systems and Equipment (SI Edition)

Sample text

Some of this mixing is intentional, as at the outdoor air intake; other mixing results from the physical characteristics of a particular component, as when untreated air passes through a coil without contacting the fins (bypass factor). All treated and untreated air must be well mixed for maximum performance of heat transfer surfaces and for uniform temperatures in the airstream. Stratified, parallel paths of treated and untreated air must be avoided, particularly in the vertical plane of systems using double-inlet or multiple-wheel fans.

CHAPTER 4 AIR HANDLING AND DISTRIBUTION Multizone Systems .................................................................... Special Systems ........................................................................ Terminal Units.......................................................................... Air Distribution System Controls ............................................. Automatic Controls and Building Management Systems ......... Maintenance Management System...........................................

If an energy analysis study is performed as part of the comparison between decentralized and centralized concepts, the resulting month-to-month energy data should be a good electronic document to benchmark actual energy consumption using the measurement and verification plan implementation. Ongoing commissioning or periodic recommissioning further ensures that the design intent is met, and that cooling and heating are reliably delivered after the warranty phase. Many central systems are designed and built with the intent to connect to facilities in a phased program, which also requires commissioning.

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