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

By ASHRAE

ISBN-10: 1621980367

ISBN-13: 9781621980360

ISBN-10: 193650426X

ISBN-13: 9781936504268

This instruction manual discusses a number of platforms and the gear (components or assemblies) they include, and describes gains and variations. this knowledge is helping method designers and operators in identifying and utilizing apparatus. This variation encompasses a new bankruptcy 18, Variable-Refrigerant-Flow structures, which describes those platforms, their elements, and appropriate criteria intimately, and contains a method layout instance and critical assistance on expenditures, controls, and protection. This instruction manual 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 folks. ASHRAE fulfills its venture of advancing heating, air flow, air-con, and refrigeration to serve humanity and advertise a sustainable international via learn, 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

Building System Commissioning.............................................. Air-Handling Units .................................................................... 3 Air-Handling Unit Psychrometric Processes ............................. 4 Air-Handling Unit Components ................................................. 6 Air Distribution ........................................................................ 10 AIR-HANDLING SYSTEMS..................................................... 10 Single-Duct Systems.................................................................

Examples of connection strategies less costly than full renovation of a connected facility are (1) return recirculation control, to maintain a design temperature across a facility connection, or (2) separation of primary distribution supply from the secondary facility connection by a plate-and-frame heat exchanger with a control valve on the primary return controlled by the secondary supply to the facility. If the temperature split is allowed to fall, increased flow of the medium through the distribution system will be required to accomplish the same capacity.

Although end users set water temperatures, the colder the cooling water, the more energy is needed by the chiller. Similar issues affect hot-water supply temperature and steam operating pressure. Supply water reset may be used when peak capacity is not needed, potentially reducing energy consumption. This reduces chiller power input, but those savings may be offset by increased pump power input because of a higher water flow rate with higher supply temperature. Also, raising chilled-water temperatures diminishes the latent removal capacity of cooling and dehumidification equipment, and may adversely affect control of interior humidity.

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


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