Download 2012 ASHRAE Handbook - Heating, Ventilating, and by ASHRAE PDF


This instruction manual discusses quite a few structures and the apparatus (components or assemblies) they include, and describes positive aspects and transformations. this knowledge is helping procedure designers and operators in making a choice on and utilizing apparatus. This variation encompasses a new bankruptcy 18, Variable-Refrigerant-Flow platforms, which describes those structures, their elements, and appropriate criteria intimately, and features a approach layout instance and significant counsel on expenses, controls, and protection. This guide is a reference for engineers operating in HVAC&R and for execs in allied fields. ASHRAE, based in 1894, is a world association of a few 50,000 people. ASHRAE fulfills its venture of advancing heating, air flow, air con, and refrigeration to serve humanity and advertise a sustainable global via study, criteria writing, publishing, and carrying on with schooling.

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

Sample text

Manufacturers’ recommendations and federal, state, and local codes and standards should also be followed. Primary Heating Equipment The major heating equipment used in central heating plants, boilers vary in type and application, and include combined heat and power (CHP) and waste heat boilers. Chapter 32 discusses boilers in detail, including the size ranges of typical equipment. A boiler adds heat to the working medium, which is then distributed throughout the building(s) and/or campus. The working medium may be either water or steam, which can further be classified by its temperature and pressure range.

The system must respond to these variations. , sedentary versus transient). ) Separate perimeter heating can operate with any all-air system. However, its greatest application has been in conjunction with VAV systems for cooling-only service. Careful design must minimize simultaneous heating and cooling. See the section on Variable Air Volume for further details. Interior spaces have relatively constant conditions because they are isolated from external influences. Cooling loads in interior zones may vary with changes in the operation of equipment and appliances in the space and changes in occupancy, but usually interior spaces require cooling throughout the year.

The importance of local gages and indicating devices, with or without a facility management system, should not be overlooked. All equipment must have adequate pressure gages, thermometers, flow meters, balancing devices, and dampers for effective performance, monitoring, and commissioning. In addition, capped thermometer wells, gage cocks, capped duct openings, and volume dampers should be installed at strategic points for system balancing. Chapter 38 of the 2011 ASHRAE Handbook— HVAC Applications indicates the locations and types of fittings required.

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