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Category: Air Distribution

Air Distribution

SINGLE-DUCT – Variable Air Volume

Posted on June 12, 2019 by Jack

A VAV system, as shown in Figure 10, controls temperature in a space by varying the quantity of supply air rather than varying the supply…

Air Distribution

SINGLE-DUCT – Constant Volume

Posted on June 12, 2019 by Jack

While maintaining constant airflow, single-duct constant volume systems change the supply air temperature in response to the space load (Figure 9). Single-Zone Systems. The simplest…

Air Distribution

AHU – Equipment Isolation

Posted on June 12, 2019 by Jack

Vibration and sound isolation equipment is required for most central fan installations. Standard mountings of fiberglass, ribbed rubber, neoprene mounts, and springs are available for…

Air Distribution

AHU – Outside Air Requirements

Posted on June 12, 2019 by Jack

common complaint regarding buildings is the lack of outside air. This problem is especially a concern in VAV systems where outside air quantities are established…

Air Distribution

AHU – Supply Air Fan

Posted on June 12, 2019 by Jack

Either axial flow, centrifugal, or plug fans may be chosen as supply air fans for straight-through flow applications. In factory-fabricated units, more than one centrifugal…

Air Distribution

AHU – Humidifiers

Posted on June 12, 2019 by Jack

Humidifiers may be installed as part of the central station airhandling unit, or in terminals at the point of use, or both. Where close humidity…

Air Distribution

AHU – Reheat Coil

Posted on June 12, 2019June 12, 2019 by Jack

Reheat systems are strongly discouraged, unless recovered energy is used (see ASHRAE Standard 90.1). Reheating is limited to laboratory, health care, or similar applications where…

Air Distribution

AHU – Cooling Coil

Posted on June 12, 2019 by Jack

In this section, sensible and latent heat are removed from the air. In all finned coils, some air passes through without contacting the fins or…

Air Distribution

AHU – Preheat Coil

Posted on June 12, 2019June 12, 2019 by Jack

The preheat coil should have wide fin spacing, be accessible for easy cleaning, and be protected by filters. If the preheat coil is located in…

Air Distribution

AHU – Mixing Plenum

Posted on June 12, 2019 by Jack

If the equipment is closely coupled to outdoor louvers in a wall, the minimum outdoor air damper should be located as close as possible to…

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