Trane TRG-TRC014-EN manual Dual-Duct

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period two

Components of a VAV System

notes

Dual-Duct

warm primary air

cool primary air

supply air

Figure 34

A dual-ductterminal unit consists of two airflow modulation devices with controls packaged in a sheet-metal enclosure. One controls the cool primary air and the other controls the warm primary air. Depending on the method of control, these two air streams may mix in the dual-duct unit before proceeding downstream to the space.

This VAV terminal unit is intended for zones that require seasonal cooling and heating, typically the exterior zones of a building. It is seldom used because of the high first cost incurred to provide two duct systems.

A dual-duct terminal unit can be controlled to provide either a variable volume or a constant volume of supply air to the space.

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TRG-TRC014-EN

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Contents Air Conditioning Clinic VAV Systems One of the Systems Series Publication of The Trane Company VAV Systems PrefaceContents TRG-TRC014-EN Constant-Volume Variable-Temperature System What Is Variable Air Volume?Constant Volume-Full Load Constant × Supply Airflow Constant Volume-Part LoadFine Constant Volume-Multiple SpacesTerminal Reheat System VAV-Full Load Variable-Air-Volume VAV SystemWhy VAV? Energy Savings VAV-Part LoadReduced fan energy Reduced refrigeration energy Dedicated terminal units Dedicated thermostats Why VAV? ComfortVAV System ComparisonVariable Thermal Load Profiles VAV Building CharacteristicsCommon Return Air Path Independent Space ControlComponents of a VAV System Components of a VAV SystemVAV Terminal Units Air Heating coil Filter Mixing fanVAV Terminal Units Primary air ir Single Duct, Cooling OnlySpace Heating with a VAV System Primary air VAV ReheatSeries Fan-Powered Terminal UnitsParallel, Fan-Powered Series, Fan-Powered Parallel Versus Series Fan-Powered Single-Duct VAV Systems Dual-Duct Cool Primary air Variable Air Volume to the SpaceSingle-Fan, Dual-Duct VAV System Constant Air Volume to the SpaceTwo-Fan, Dual-Duct VAV System VAV Terminal Unit Controls Upstream Pressure Affects AirflowVAV Terminal Unit Controls Pressure-Independent Control Pressure-Dependent ControlTerminal-Unit Control Technologies Primary Airflow MeasurementPneumatic Control Electronic Control Direct Digital Control DDC Components of a VAV System Diffusers DiffusersEffect Linear Slot DiffuserCeiling-Diffuser Compatibility Components of a VAV System Supply Duct System Supply Duct SystemDuct Design Equal friction methodStatic regain method Duct Design Recommendations Perimeter P Versus Interior System ConfigurationsPerimeter Spaces Perimeter SpacesBaseboard Perimeter Heating Overhead Supply Perimeter Heating Heat loss 250 Btu/hr/ft Dual-Duct VAV Fan-Powered VAVInterior Spaces, Reheat Required Interior SpacesChangeover/Bypass VAV System Small BuildingsSystem-Level Control Modes Occupied mode Unoccupied mode Morning warm-up/cool-down modeOccupied Mode Unoccupied Mode Morning Warm-up/Cool-down Mode Fan Modulation Fan Performance CurveFan Performance Curve System Resistance Curve System Resistance CurveRiding the Fan Curve Operating PointForward-Curved Centrifugal Fan Fan Modulation Curve Fan Modulation CurveVAV Fan Modulation Fan Control LoopDischarge Dampers Fan Modulation MethodsStatic pressure Discharge damper SP loss Inlet Vanes 0 r p m Fan-Speed ControlVariable-Pitch Blade Control BI fan with Discharge Dampers Fan Modulation ComparisonsFan Outlet Static-Pressure Control Controlling System Static PressureSensor located Down supply duct Supply Duct Static-Pressure ControlAt fan outlet Optimized Static-Pressure ControlPart-Load Comparison Period five Application ConsiderationsSystem-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-Period One ReviewReview-Period Two Review-Period Four Review-Period ThreeTrane Air Conditioning Manual Review-Period FiveReview Questions for Period QuizQuiz 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.

The guide also highlights Trane’s commitment to sustainable practices. The incorporation of environmentally friendly refrigerants and compliance with regulatory standards ensures that Trane units not only deliver comfort but also contribute to lower environmental impact. The guide provides detailed specifications on these refrigerants, allowing engineers to make informed decisions in line with environmental policies.

Another important aspect of the TRG-TRC014-EN is its technical information regarding system design and application. With comprehensive data on airflow, capacity calculations, and installation techniques, the guide serves as a valuable resource in the design phase of HVAC projects. This ensures that systems are optimized for performance and meet the specific needs of any given commercial space.

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.
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