Trane Round In/Round Out Detailliste PDF herunterladen (Seite 141)

VAV-PRC011M-EN 141

Application Considerations

Fan-Pressure Optimization

With Trane's Integrated Comfort System, the information from VAV terminal units can be used for

other energy-saving strategies. Fan-pressure optimization is the concept of reducing the supply fan

energy usage based on the position of the terminal unit dampers.

The control system allows this scenario. The system polls the VAV units for the damper position

on each unit. The supply fan is modulated until the most wide-open damper is between 85% and

95% open. The correct airflow is still being sent to the zones since the controls of the VAV units are

pressure-independent, and the fan modulates to an optimal speed and duct static pressure which

results in fan energy savings.

Ventilation Reset

The Ventilation Reset control strategy enables a building ventilation system to bring in an

appropriate amount of outdoor air per ASHRAE Standard 62.1. The basis for the strategy is

measuring airflow at each zone, calculating current system ventilation efficiency using the

multiple-zone system equations of the standard, and communicating a new outdoor airflow

setpoint to the air handler.

This strategy continually monitors the zone ventilation needs and system outdoor air intake flow,

minimizing the amount of ventilation air and increasing the energy efficiency of the system. This

ensures that the right amount of air is brought in at all times and that proper ventilation can be

documented. Trane has integrated this control ability into the VAV controls, air-handler controls,

and building controls.

For more detailed information on these energy-saving strategies, please refer to “Additional VAV

System and Product References,” p. 156 for appropriate material.

Figure 11. Optimized static-pressure control

static

pressure

sensor

supply

fan

RTU controller

Tracer SC

VAV boxes with

DDC controllers

VFD

1 2 ... 136 137 138 139 140 141 142 143 144 145 146 ... 157 158

Keine Kommentare

Trane Round In/Round Out Detailliste Seite 141