AG31-004 - School HVAC Design Manual by McQuay

By McQuay

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A good example of an independent box is a constant volume box. As the supply duct pressure fluctuates, the box’s damper modulates to maintain a fixed airflow rate. Independent systems are more desirable because they offer better control. Dependent systems cost less and are generally limited to Variable Volume, Variable Temperature (VVT) systems. They are not commonly used in school applications. VAV and Diversity VAV systems allow the option of diversity. The cooling load for each zone (classroom) is calculated individually.

The basic unit has an economizer section, filters, supply fan, integral DX cooling advanced controls and modulating gas heat. Return fans, other forms of heat (hot water, steam, electric) and energy recovery are also available. Figure 39, McQuay RPS  Unit Applied systems have a wide operating range. Typically there are multiple DX circuits with several stages of unloading. The DX coils can be selected with various numbers of rows and fins/inch to meet the design conditions and to allow the units to be configured for optimal air temperature applications.

4) which must be met. Air distribution within the space is critical to maintaining space conditions and minimizing sound concerns. Refer to the Sound Issues section of this manual for quiet duct design. VAV systems complicate matters because the terminal devices must work over a wide range of airflows without dumping. Be careful not to oversize the terminal device with VAV systems. Figure 36, Central System Psychrometrics To calculate the required supply air in the space, the internal heat gain must first be calculated.

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