Download HVAC Systems Duct Design by SMACNA PDF

By SMACNA

The Sheet steel and Air Conditioning Contractors' nationwide organization, Inc. (SMACNA), in retaining with its coverage of disseminating details and delivering criteria of layout and development, deals this accomplished and basic "HVAC SystemsDuct layout" guide as a part of the ongoing attempt to improve the heating, ventilating and air con (HVAC) undefined. This handbook provides the fundamental tools and approaches had to layout HVAC air distribution platforms. It doesn't take care of the selection of air-con so much and room air quantities.This guide is half one of a 3 set "HVAC structures" Library. The moment is the SMACNA "HVAC Systems-Applications" guide which comprises details and information wanted through designers and installers of extra really expert air and hydronic HVAC structures. The 3rd guide is the "HVAC SystemsTesting, Adjusting and Balancing" handbook, a stateof-the-art e-book on air and hydronic method checking out and balancing.

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Some duct resizing may be required at this stage to incorporate the necessary acoustical treatment into the duct system design. PRESSURE CLASSIFICATION It is beneficial to all concerned to have the designer indicate all ductwork static pressure classification changes on the drawings. For clear interpretation of the requirements for ductwork and economical attainment of performance objectives, it is essential that the contract plans depict the portion of each duct system to be constructed for a particular static pressure classification (see Table 4-1).

For constant temperature differential, airflow rate affects drop more than velocity. Therefore, to avoid drop, several small outlets may be better in a room instead of one large outlet. With "Isothermal Jets", the throw may be selected for a portion of the distance between the outlet and wall or, preferably, for the entire distance. For outlets in opposite walls, the throw should be one-half the distance between the walls. Following the above recommendations, the air drops before striking the opposite wall or the opposing airstream.

AIR DISTRIBUTION c) Locate outlets in the room to distribute the air as uniformly as possible. Outlets may be sized and located to distribute air in proportion to the heat gain or loss in various portions of the room. d) Select proper outlet size from manufacturers' ratings according to air quantities, discharge velocities, distribution patterns, and sound levels. Note manufacturers' recommendations with regard to use. In an open space configuration, the interaction of airstreams from multiple diffuser sources may alter single diffuser throw data or single diffuser air temperature air velocity data, and it may not be sufficient to predict particular levels of air motion in a space.

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