By American Society of Heating
The 2008 ASHRAE instruction manual - HVAC platforms and kit discusses quite a few platforms and the gear (components or assemblies) that contain them, and describes good points and variations. this knowledge is helping procedure designers and operators in deciding upon and utilizing gear. it's divided into seven sections:
- Air-Conditioning and Heating platforms
- Air-Handling apparatus and elements
- Heating gear and elements
- Cooling gear and elements
- General parts
- Packaged, Unitary and Split-System gear
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Extra info for 2008 ASHRAE Handbook - Heating, Ventilating, and Air-Conditioning Systems and Equipment (I-P Edition)
Of water or less. Low-leakage dampers, such as those for outside intakes, prevent rattling and minimize leakage. The relief air opening should be located so that air does not short-circuit to the outside air intake. Return Air Dampers Negative pressure in the outside air intake plenum is a function of the resistance or static pressure loss through the outside air louvers, damper, and duct. Positive pressure in the relief air plenum is likewise a function of the static pressure loss through the relief damper, the relief duct between the plenum and outside, and the relief louver.
Pressure relationships between various sections of this mixing process must be considered to ensure that automatic dampers are properly sized for wide-open and modulating pressure drops. See ASHRAE Guideline 16 for additional detail. Relief Openings Relief openings in large buildings should be constructed similarly to outside air intakes, but may require motorized or self-acting backdraft dampers to prevent high wind pressure or stack action from causing airflow to reverse when the automatic dampers are open.
Chapter 23 has more information on this topic. , outside and return air) into a common airstream can be shown on a psychrometric chart with reasonable accuracy (see Chapter 6 of the 2005 ASHRAE Handbook—Fundamentals). The following sections describe many commonly available airhandling unit components. Not all of these components will necessarily be used in any one system. To determine the system’s air-handling requirement, the designer must consider the function and physical characteristics of the space to be conditioned, and the air volume and thermal exchange capacities required.
2008 ASHRAE Handbook - Heating, Ventilating, and Air-Conditioning Systems and Equipment (I-P Edition) by American Society of Heating