System No. 1 VAV with Parallel Fan-Powered Boxes

A Variable Air Volume (VAV) with Parallel Fan-Powered Boxes system, as defined in EnergyPlus HVACTemplate, is a climate control system commonly used in medium to large commercial buildings. It consists of a central air handling unit (AHU) that supplies variable volumes of cooled air through ductwork to multiple VAV terminal units serving different zones throughout the building.

The central AHU includes cooling coils (typically chilled water), heating coils, filters, and fans to condition and distribute primary air. Each parallel fan-powered box contains a small fan that operates in parallel with the primary air supply, drawing plenum air and mixing it with the primary air to maintain airflow and provide heating through integrated reheat coils (electric, hot water, or gas).

The system draws outdoor air for ventilation through the central AHU, and the combination of central and terminal unit fans distributes conditioned air throughout the building, ensuring effective temperature control, improved air circulation, and individual zone comfort.

This configuration is particularly suitable for applications where centralized air handling with multi-zone control, enhanced air distribution, and energy-efficient VAV operation is preferred.

A Variable Air Volume (VAV) with Parallel Fan-Powered Boxes system comprises:

• Plant HVAC component - Air Handling Unit

• Space HVAC component - Parallel PIU

The 'Select HVAC Template' form allows for multiple Spaces to be served. Clicking into the 'Spaces' field shows a list of available Spaces. Each selected Space will have one VAV Terminal Unit with Parallel Fan-Powered Box Space HVAC component, providing individual zone climate control.