Fan Pressure Optimization The Trane Company American Standard

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

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

Fan Pressure Control Static Pressure (in. wg) System Resistance At Design Conditions 1000 rpm A 2. 70 Airflow (1000 cfm) 24 © American Standard Inc. 1996

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

Fan Pressure Control Methods Fan Outlet Static Pressure (in. wg) 1000 rpm, IGV 100% Open 1000 rpm, IGV Partially Open SPC=1. 40 System Resistance At Part Load System Resistance At Design A C 13 bhp Fan Modulation Curve Airflow (1000 cfm) 18 24 © American Standard Inc. 1996

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

Fan Pressure Control Methods Supply Duct Static Pressure (in. wg) 1000 rpm, IGV 100% Open 1000 rpm, IGV Partially Open System Resistance At Part Load System Resistance At Design A D 12 bhp Fan Modulation Curve SPC=0. 80 Airflow (1000 cfm) 18 24 © American Standard Inc. 1996

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

Fan Pressure Control Methods Fan Pressure Optimization Static Pressure (in. wg) System Resistance Curve 1000 rpm, IGV 100% Open A 1000 rpm, IGV Partially Open E 9. 5 bhp Airflow (1000 cfm) 18 24 © American Standard Inc. 1996

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

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

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

Ventilation Reset With Pressure Optimization Yields … 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 © American Standard Inc. 1996