2012 ASHRAE Handbook - Heating, Ventilating, and by ASHRAE


This guide discusses numerous platforms and the gear (components or assemblies) they include, and describes gains and changes. this knowledge is helping method designers and operators in deciding upon and utilizing apparatus. This version incorporates a new bankruptcy 18, Variable-Refrigerant-Flow platforms, which describes those platforms, their parts, and appropriate criteria intimately, and features a procedure layout instance and demanding information on bills, controls, and security. This guide is a reference for engineers operating in HVAC&R and for execs in allied fields. ASHRAE, based in 1894, is a global 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 international via study, 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 (I-P Edition)

Example text

Personnel safety, security, ambient noise, and contamination from hazardous water vapors are some of the considerations that help determine final equipment location. , steel to support roof-mounted equipment, or a concrete pad and structural steel needed to locate equipment at or near grade) require evaluation. When locating a cooling tower at or near grade, the net positive suction head and overflow of condenser water out of the cooling tower sump should be studied if the tower is below, at, or slightly above the level of the chiller.

Determining the optimum cooling and heating water supply and return temperatures requires design consideration of equipment performance, particularly the energy required to produce the supply water temperature. 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.

Mechanical failure of a central air-handling component, such as a fan or a cooling-coil control valve, affects all zones served by that unit. System selection should be related to the need, as indicated by the load characteristics. The designer should understand the operation of system components, their relationship to the psychrometric chart, and their interaction under various operating conditions and system configurations. The design engineer must properly determine an air-handling system's required supply air temperature and volume; outdoor air requirements; desired space pressures; heating and cooling coil capacities; humidification and dehumidification capacities; return, relief, and exhaust air volume requirements; and required pressure capabilities of the fan(s).

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