By American Society of Heating
The 2008 ASHRAE instruction manual - HVAC structures and gear discusses quite a few structures and the apparatus (components or assemblies) that contain them, and describes gains and transformations. this knowledge is helping method designers and operators in determining and utilizing apparatus. it's divided into seven sections:
- Air-Conditioning and Heating structures
- Air-Handling apparatus and elements
- Heating apparatus and elements
- Cooling gear and elements
- General parts
- Packaged, Unitary and Split-System gear
Read or Download 2008 ASHRAE Handbook - Heating, Ventilating, and Air-Conditioning Systems and Equipment (I-P Edition) PDF
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Additional resources for 2008 ASHRAE Handbook - Heating, Ventilating, and Air-Conditioning Systems and Equipment (I-P Edition)
8 Chemical Humidification Fig. 8 Chemical Dehumidification Steam Injection Humidification AIR-HANDLING UNIT COMPONENTS Fig. 7 Steam Injection Humidification air. Similarly, air will also be dehumidified if a fluid with a temperature below the airstream dew point is sprayed into the airstream (see the section on Air Washers in Chapter 40). The process is identical to that shown in Figure 2, except that the moisture condensed from the airstream condenses on, and dissolves in, the spray droplets instead of on the solid coil surface.
Failure of an air-handling unit affects only the part of the building served by that one unit. Fans Both packaged and built-up air-handling units can use any type of fan. Centrifugal fans may be forward-curved, backward-inclined, or airfoil, and single-width/single-inlet (SWSI) or double-width/ double-inlet (DWDI). Many packaged air-handlers feature a single fan, but it is possible for packaged and custom air handlers to use multiple DWDI centrifugal fans on a common shaft with a single drive motor.
Coil freezing can be a serious problem with chilled-water coils. Full-flow circulation of chilled water during freezing weather, or even reduced flow with a small recirculating pump, minimizes coil freezing and eliminates stratification. Further, continuous full-flow circulation can provide a source of off-season chilled water in airand-water systems. Antifreeze solutions or complete coil draining also prevent coil freezing. However, because it is difficult (if not impossible) to drain most cooling coils completely, caution should be used if this option is considered.