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

By ASHRAE

This instruction manual discusses quite a few structures and the gear (components or assemblies) they include, and describes beneficial properties and ameliorations. this data is helping approach designers and operators in picking and utilizing apparatus. This version features a new bankruptcy 18, Variable-Refrigerant-Flow structures, which describes those platforms, their parts, and acceptable criteria intimately, and features a procedure layout instance and significant counsel on expenses, controls, and protection. This instruction manual is a reference for engineers operating in HVAC&R and for pros in allied fields. ASHRAE, based in 1894, is a world association of a few 50,000 individuals. ASHRAE fulfills its challenge 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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Extra resources for 2012 ASHRAE Handbook - Heating, Ventilating, and Air-Conditioning Systems and Equipment (SI Edition)

Example text

During conceptual planning and design, or as early in design as possible, the engineer should evaluate the type(s) of existing facilities to which the central system will be connected. When using variable-flow distribution with a constant design temperature split between the supply and return medium, it is critical to avoid low 'T syndrome (see the section on System Characteristics). The engineer should attempt to ensure the condition is minimized or avoided, or at minimum perform due diligence to make the owner aware of the potential shortfalls where it is allowed to occur.

Interior spaces with a roof exposure, however, may require treatment similar to perimeter spaces that require heat. Space Heating Although steam is an acceptable medium for central system preheat or reheat coils, low-temperature hot water provides a simple and more uniform means of perimeter and general space heating. Individual automatic control of each terminal provides the ideal space comfort. A control system that varies water temperature inversely with the change in outdoor temperature provides water temperatures that produce acceptable results in most applications.

Controlling humidity in a space can affect the air quantity and become the controlling factor in selecting supply airflow rate. All-air systems provide only limited humidity control, particularly at part loads, so if humidity is critical, extra care must be taken in design. 3 location is more economical. Also, central air-handling equipment requires less maintenance than a similar total capacity of multiple small packaged units. The many terminal units used in an all-air system do, however, require periodic maintenance.

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