1. © American Standard Inc. 1996 Fan Pressure Optimization The Trane Company

2. © American Standard Inc. 1996 Fan Pressure Control Methods s Fan outlet static pressure s Supply duct static pressure s Fan pressure optimization

3. © American Standard Inc. 1996 Fan Pressure Control Static Pressure (in. wg) 2.70 1000 rpm A System Resistance At Design Conditions 24 Airflow (1000 cfm)

4. © American Standard Inc. 1996 Fan Pressure Control Methods Fan Outlet Static Pressure Pressure Control Loop

5. © American Standard Inc. 1996 Fan Pressure Control Methods Fan Outlet Static Pressure Static Pressure (in. wg) SPC=1.40 1000 rpm, IGV 100% Open System Resistance At Design Airflow (1000 cfm) System Resistance At Part Load 1000 rpm, IGV Partially Open Fan Modulation Curve 2418 13 bhp C A

6. © American Standard Inc. 1996 Fan Pressure Control Methods Supply Duct Static Pressure Pressure Control Loop Approximately 2/3 Down Duct

7. © American Standard Inc. 1996 Fan Pressure Control Methods Supply Duct Static Pressure © American Standard Inc. 1996 System Resistance At Part Load A System Resistance At Design Airflow (1000 cfm) 2418 Static Pressure (in. wg) SPC=0.80 Fan Modulation Curve 1000 rpm, IGV Partially Open 1000 rpm, IGV 100% Open D 12 bhp

8. © American Standard Inc. 1996 Fan Pressure Control Methods Fan Pressure Optimization Communicating BAS Fan Speed Or Inlet Vane Position Duct Pressure Sensor Damper Positions

9. © American Standard Inc. 1996 Fan Pressure Control Methods Fan Pressure Optimization A System Resistance Curve Airflow (1000 cfm) 2418 Static Pressure (in. wg) 1000 rpm, IGV Partially Open 1000 rpm, IGV 100% Open E 9.5 bhp

10. © American Standard Inc. 1996 Fan Pressure Control Methods Fan Optimization Control Logic

11. © American Standard Inc. 1996 Total Building HVAC Energy Fan Control Method Comparison MiamiMpls.SeattleToronto 93 94 95 96 97 98 99 100 MiamiMpls.SeattleToronto Fan Outlet Control Duct Static Pressure Fan Pressure Optimization % HVAC Energy Consumption Analysis performed with TRACE® 600 building energy and economic analysis software.

12. © American Standard Inc. 1996 Ventilation Reset And Fan Pressure Optimization Flow Control At ASHRAE OA Ventilation Reset With Pressure Optimization MiamiMpls.SeattleToronto 50 60 70 80 90 100 Flow Control With Pressure Optimization % HVAC Energy Consumption Analysis performed with TRACE® 600 building energy and economic analysis software.

13. © American Standard Inc. 1996 Ventilation Reset With Pressure Optimization System Requirements s VAV terminals with DDC controls s Air handler with controls s Ability of measure and modulate OA s Method of supply fan control s Building Automation System capable of solving ASHRAE 62-89 Equation 6.1

14. © American Standard Inc. 1996 s All zones properly ventilated at all loads s No zones are starved for air s Substantially reduced “system” operating costs s Nonproprietary system components s Faster system start-up and installation due to factory-installed and commissioned controls Ventilation Reset With Pressure Optimization Yields …