By American Society of Heating
The 2008 ASHRAE guide - HVAC platforms and gear discusses a variety of platforms and the gear (components or assemblies) that include them, and describes good points and changes. this data is helping process designers and operators in opting for and utilizing gear. it really is divided into seven sections:
- Air-Conditioning and Heating structures
- Air-Handling apparatus and parts
- Heating gear and elements
- Cooling apparatus and elements
- General parts
- Packaged, Unitary and Split-System apparatus
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)
For example, if heat recovery devices are used, intake and exhaust airstreams may need to be run in parallel, such as through air-to-air plate heat exchangers. Louvers must be separated enough to avoid short-circuiting air. Furthermore, intake louvers should not be near a potential source of contaminated air, such as a boiler stack or hood exhaust. Relief air should also not interfere with other systems. A common complaint in buildings is a lack of outside air. This is especially a concern in VAV systems in which outside air quantities are established for peak loads and are then reduced in proportion to the air supplied during periods of reduced load.
This allows direct airflow from the fan wheel into the supply duct without abrupt change in direction and loss in efficiency. It also allows a more gradual transition from the fan to the duct and increases static regain in the velocity pressure conversion. To minimize inlet losses, the distance between casing walls and fan inlet should be at least the diameter of the fan wheel. With a single-inlet fan, the length of the transition section should be at least half the width or height of the casing, whichever is longer.
Air distribution ductwork and terminal devices selected must be compatible or the system will either fail to operate effectively or incur high first, operating, and maintenance costs. Ductwork Design Chapter 35 of the 2005 ASHRAE Handbook—Fundamentals describes ductwork design in detail and gives several methods of sizing duct systems, including static regain, equal friction, and T-method. Duct sizing is often performed manually for simple systems, but commercially available duct-sizing software programs are often used for larger and complex systems.