Download PDF by American Society of Heating: 2008 ASHRAE Handbook - Heating, Ventilating, and
By American Society of Heating
The 2008 ASHRAE instruction manual - HVAC structures and gear discusses a variety of structures and the apparatus (components or assemblies) that contain them, and describes positive aspects and changes. this data is helping process designers and operators in identifying and utilizing apparatus. it really is divided into seven sections:
- Air-Conditioning and Heating platforms
- Air-Handling apparatus and elements
- Heating apparatus and elements
- Cooling apparatus 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)
Fan control is from two static-pressure controllers, one located in the hot deck and the other in the cold deck. The duct requiring the highest pressure governs the airflow by signaling the supply fan VFD speed control. An alternative is to add discharge supply air duct damper control to both the cold and hot ducts to vary flow while the supply fan operates up and down its fan curve. Return air fan tracking of discharge supply air must be assessed with this application. Usually, the cold deck is maintained at a fixed temperature, although some central systems allow the temperature to rise during warmer weather to save refrigeration.
Electric coils may also be used. See Chapter 26 for more information. Humidifiers Humidifiers may be installed as part of the air-handling unit, or in terminals at the point of use, or both. Where close humidity control of selected spaces is required, the entire supply airstream may be humidified to a low humidity level in the air handler. Terminal humidifiers in the supply ducts serving selected spaces bring humidity up to the required levels. For comfort installations not requiring close control, moisture can be added to the air by mechanical atomizers or point-of-use electric or ultrasonic humidifiers.
However, because it is difficult (if not impossible) to drain most cooling coils completely, caution should be used if this option is considered. Another design consideration is the drain pan. 1 calls for drain pans to be sloped to a drain, to avoid holding standing water in the air-handling unit. Because of the constant presence of moisture in the cooling coil drain pan and nearby Air Handling and Distribution casing, many designers require stainless steel construction in that portion of the air-handling unit.
2008 ASHRAE Handbook - Heating, Ventilating, and Air-Conditioning Systems and Equipment (I-P Edition) by American Society of Heating