Download e-book for kindle: 2008 ASHRAE Handbook - Heating, Ventilating, and by American Society of Heating

By American Society of Heating

ISBN-10: 1601197950

ISBN-13: 9781601197955

ISBN-10: 193374233X

ISBN-13: 9781933742335

The 2008 ASHRAE guide - HVAC platforms and gear discusses a variety of structures and the apparatus (components or assemblies) that include them, and describes good points and variations. this knowledge is helping process designers and operators in picking and utilizing apparatus. it truly is divided into seven sections:

  • Air-Conditioning and Heating structures
  • Air-Handling gear and parts
  • Heating apparatus and parts
  • Cooling gear and parts
  • General parts
  • Packaged, Unitary and Split-System gear
  • General
    This identify has been lately up to date with 221 Digitized Graphs and a couple of Interactive Tables masking potency, radiation warmth flux, functionality, warmth loss and plenty of different worthy themes.

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    Read Online or Download 2008 ASHRAE Handbook - Heating, Ventilating, and Air-Conditioning Systems and Equipment (I-P Edition) PDF

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    Additional info for 2008 ASHRAE Handbook - Heating, Ventilating, and Air-Conditioning Systems and Equipment (I-P Edition)

    Example text

    Ideally, this system responds completely to the space needs, and well-designed control systems maintain temperature and humidity closely and efficiently. Single-zone systems often involve short ductwork with low pressure drop and thus low fan energy, and can be shut down when not required without affecting operation of adjacent areas, offering further energy savings. A return or relief fan may be needed, depending on system capacity and whether 100% outside air is used for cooling as part of an economizer cycle.

    Either arrangement is possible in both small and large air-handling units, and in factorypackaged and custom field-erected units. A draw-through system (illustrated in Figure 1) draws air across the coils. A draw-through system usually provides a more even air distribution over all parts of the coil. However, some fan heat is added to the airstream after the air has crossed the cooling coil and must be taken into account when calculating the desired supply air temperature. A blow-through system (illustrated in Figure 1) requires some caution on the part of the designer, because the blast effect of the supply fan outlet can concentrate a high percentage of the total air over a small percentage of the downstream coil surfaces.

    Unfortunately, the mixing effectiveness and pressure drop of field-built solutions are unknown. If stratification is anticipated in a system, then special mixing equipment that has been tested by the manufacturer (see the section on Static Air Mixers) should be specified and used in the airhandling system. Static Air Mixers Static air mixers are designed to enhance mixing in the mixing plenum to reduce or eliminate problems associated with stratification. These devices have no moving parts and create turbulence in the airstream, which increases mixing.

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    2008 ASHRAE Handbook - Heating, Ventilating, and Air-Conditioning Systems and Equipment (I-P Edition) by American Society of Heating

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