Trane TRG-TRC014-EN manual Part-Load Comparison

Page 72

period four

Fan Modulation

notes

Part-Load Comparison

control

airflow

fan static

fan input

% full-load

method

pressure

power

power

 

 

 

 

 

full load

24,000 cfm

2.7 in. H2O

22 hp

100%

 

[11.3 m3/s]

[672.5 Pa]

[16.4 kW]

 

part load

 

 

 

 

fan outlet

18,000 cfm

2.1 in. H2O

13 hp

60%

 

[8.5 m3/s]

[523.1 Pa]

[9.7 kW]

 

supply duct

18,000 cfm

1.9 in. H2O

12 hp

55%

 

[8.5 m3/s]

[473.3 Pa]

[8.9 kW]

 

optimized

18,000 cfm

1.5 in. H2O

9.5 hp

43%

 

[8.5 m3/s]

[373.6 Pa]

[7.1 kW]

 

Figure 94

Acomparison of these static-pressure control methods demonstrates the energy savings potential. At this representative part-load condition, using the optimized static-pressure control method allows the supply fan to use only 43% of its full-load power versus 55% for the supply duct static-pressure control method.

In addition to the supply fan energy savings, because the optimized static- pressure control method allows the system to operate as if the static pressure sensor was at each individual terminal unit, it ensures that no spaces are “starved” for air. There are also acoustical benefits at part load by operating the supply fan and VAV terminal units at the lowest possible duct static pressure.

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 LoadWhy VAV? Energy Savings VAV-Part LoadReduced fan energy Reduced refrigeration energy 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 Air Heating coil Filter Mixing fanVAV Terminal Units 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 Upstream Pressure Affects AirflowVAV Terminal Unit Controls 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 SystemDuct Design Equal friction methodStatic regain 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 Modulation Fan Performance CurveFan 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 Measures to Prevent Coil Freeze-UpFreeze Protection for Coils Part-Load Space Humidity Control Part-Load Space Humidity ControlPart-Load Supply Air Tempering Building Pressure Control Direct Pressurization ControlBuilding Pressure 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

The Trane TRG-TRC014-EN is a comprehensive technical resource guide that serves as an essential tool for HVAC professionals and engineers looking to enhance their understanding of Trane's commercial HVAC systems. This guide provides an in-depth examination of Trane’s advanced technologies, key features, and design characteristics that position their products as industry leaders in heating, ventilation, and air conditioning.

One of the standout features of the TRG-TRC014-EN is its focus on energy efficiency. Trane continuously works on incorporating cutting-edge technologies that minimize energy consumption while maximizing performance. This includes the use of variable speed compressors and advanced control systems that adapt the HVAC operation according to real-time demand, significantly reducing energy costs for end users.

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Additionally, the TRG-TRC014-EN addresses integration with smart building technologies. Trane units are designed to easily integrate with building management systems (BMS), enabling better monitoring and control of HVAC operations. This compatibility enhances operational efficiency and supports predictive maintenance, reducing downtime and servicing costs.

Moreover, the guide emphasizes Trane’s extensive warranty and service support. Understanding that customer satisfaction extends beyond the sale, Trane provides comprehensive service options that assure users of reliable and prompt support throughout the lifecycle of their HVAC systems.

In conclusion, the Trane TRG-TRC014-EN stands as an essential guide for HVAC professionals seeking to leverage Trane’s innovative technologies and design features. With a strong emphasis on energy efficiency, sustainability, technical accuracy, smart integration, and robust support, this guide underscores Trane's position as a leader in the HVAC industry.