Trane TRG-TRC014-EN manual Duct Design Recommendations

Page 44

period two

Components of a VAV System

notes

Duct Design Recommendations

▲Keep as simple and symmetrical as possible

▲Locate main runs, branch runs, and terminal units above hallways or unoccupied spaces

▲Minimize use of flexible ductwork upstream of terminal units

▲Use duct lining or a duct silencer in first duct section to attenuate supply fan noise

▲Place balancing dampers upstream of diffusers in all noncritical branches

▲Reducing transitions should be several duct diameters upstream of terminal units

Figure 54

Other publications contain more complete details related to duct design, but here are a few general recommendations:

nKeep the duct layout as simple and symmetrical as possible

nPlace main duct runs and, when possible, branch runs and terminal units, above hallways and other “unoccupied” areas to ease installation and maintenance and to help attenuate the sound radiated to the occupied spaces

nLimit the use of flexible ductwork upstream of the terminal unit

nApply a duct lining or duct silencer to the first section of the duct system in order to attenuate supply fan noise

nAdd balancing dampers upstream of diffusers in all noncritical branches

nIf needed, reducing transitions should be located several duct diameters upstream of terminal units

TRG-TRC014-EN

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Contents Air Conditioning Clinic VAV Systems One of the Systems Series Publication of The Trane Company Preface VAV SystemsContents TRG-TRC014-EN What Is Variable Air Volume? Constant-Volume Variable-Temperature SystemConstant Volume-Full Load Constant Volume-Part Load Constant × Supply AirflowConstant Volume-Multiple Spaces FineTerminal Reheat System Variable-Air-Volume VAV System VAV-Full LoadReduced fan energy Reduced refrigeration energy Why VAV? Energy SavingsVAV-Part Load Why VAV? Comfort Dedicated terminal units Dedicated thermostatsSystem Comparison VAVVAV Building Characteristics Variable Thermal Load ProfilesIndependent Space Control Common Return Air PathComponents of a VAV System Components of a VAV SystemVAV Terminal Units VAV Terminal UnitsAir Heating coil Filter Mixing fan Single Duct, Cooling Only Primary air irSpace Heating with a VAV System VAV Reheat Primary airFan-Powered Terminal Units SeriesParallel, Fan-Powered Series, Fan-Powered Parallel Versus Series Fan-Powered Single-Duct VAV Systems Dual-Duct Variable Air Volume to the Space Cool Primary airConstant Air Volume to the Space Single-Fan, Dual-Duct VAV SystemTwo-Fan, Dual-Duct VAV System VAV Terminal Unit Controls VAV Terminal Unit ControlsUpstream Pressure Affects Airflow Pressure-Dependent Control Pressure-Independent ControlPrimary Airflow Measurement Terminal-Unit Control TechnologiesPneumatic Control Electronic Control Direct Digital Control DDC Components of a VAV System Diffusers DiffusersLinear Slot Diffuser EffectCeiling-Diffuser Compatibility Components of a VAV System Supply Duct System Supply Duct SystemStatic regain method Duct DesignEqual friction method Duct Design Recommendations System Configurations Perimeter P Versus InteriorPerimeter Spaces Perimeter SpacesBaseboard Perimeter Heating Overhead Supply Perimeter Heating Heat loss 250 Btu/hr/ft Fan-Powered VAV Dual-Duct VAVInterior Spaces Interior Spaces, Reheat RequiredSmall Buildings Changeover/Bypass VAV SystemOccupied mode Unoccupied mode Morning warm-up/cool-down mode System-Level Control ModesOccupied Mode Unoccupied Mode Morning Warm-up/Cool-down Mode Fan Performance Curve Fan ModulationFan Performance Curve System Resistance Curve System Resistance CurveOperating Point Riding the Fan CurveForward-Curved Centrifugal Fan Fan Modulation Curve Fan Modulation CurveFan Control Loop VAV Fan ModulationFan Modulation Methods Discharge DampersStatic pressure Discharge damper SP loss Inlet Vanes Fan-Speed Control 0 r p mVariable-Pitch Blade Control Fan Modulation Comparisons BI fan with Discharge DampersControlling System Static Pressure Fan Outlet Static-Pressure ControlSupply Duct Static-Pressure Control Sensor located Down supply ductOptimized Static-Pressure Control At fan outletPart-Load Comparison Application Considerations Period fiveSystem-Level Ventilation System-Level VentilationVentilation Reset Freeze Protection for Coils Freeze Protection for CoilsMeasures to Prevent Coil Freeze-Up Part-Load Space Humidity Control Part-Load Space Humidity ControlPart-Load Supply Air Tempering Building Pressure Control Building Pressure ControlDirect Pressurization Control Application Considerations Review Review-Period OneReview-Period Two Review-Period Three Review-Period FourReview-Period Five Trane Air Conditioning ManualReview Quiz Questions for PeriodQuiz TRG-TRC014-EN Answers Glossary Glossary Glossary Trane Company

TRG-TRC014-EN specifications

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