Trane trg-trc005-en manual 80ºF

Page 29

period three

Evaporators

notes

The face-splitcoil configuration, also called horizontal-split or parallel-flow, is split into parallel sections. A portion of the air passes through the top section, the remainder passes through the bottom section, and the two airstreams mix downstream of the coil.

Face-Split Arrangement

 

 

 

 

 

 

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[27ºC]

 

 

 

 

 

 

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[-1.1ºC]

55ºF

[13ºC]

Figure 33

At lower loads, only one section of the face-split coil is active. A portion of the air passes through the active lower section and is cooled, while the rest of the air passes through the inactive top section and remains unconditioned. The two airstreams mix downstream of the coil, producing average temperature and humidity conditions. At higher loads, both sections of the coil are activated, providing a more uniform leaving-air temperature.

In a VAV application, where the leaving air is controlled to a constant temperature, the active section of coil must supply colder air than the desired average temperature at part load. Consequently, the refrigerant must get colder at part load, eventually reaching a condition where the coil surface is cold enough that the water condensing from the air will create frost on the coil. Resetting the supply air temperature upward can help to avoid this problem, but this may result in space humidity problems.

In constant-volume applications, where the leaving-air temperature varies to respond to changing loads, this is not as much of a concern since the average mixed temperature rises at part-load conditions. Therefore, face-split coils are well suited for constant-volume applications. They provide better part-load humidity control than could be obtained from a large coil controlled by a single expansion valve. In a constant-volume application, the lower section of a face- split coil should be activated first and deactivated last. This sequence prevents moisture that has condensed from the air flowing through the active coil section from flowing over the fins of the inactive coil section, where it could carry over into the supply airstream.

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TRG-TRC005-EN

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Contents Air Conditioning Clinic Refrigeration System Components One of the Fundamental Series Comment CardBusiness Reply Mail Refrigeration System Components Refrigeration System Components PrefaceContents TRG-TRC005-EN Vapor-Compression Refrigeration IntroductionRefrigeration Cycle Refrigeration CyclePeriod one Condenser Air-Cooled Condensers CondensersAir-Cooled Condenser Effect of Subcooling Evaporative Condensers Centrifugal Fan Air-Cooled CondenserEvaporative Condenser Water-Cooled Condensers Water-Cooled CondenserCooling Tower Condenser Control Condenser ControlCondenser Capacity Condensing Temperature Control Vary Condenser Water Flow Rate Vary Entering Water TemperatureCooling Tower Bypass Condenser Flooding Control Air-Cooled Condenser ControlCondensers Finned-Tube Evaporators EvaporatorsFinned-Tube Evaporator Turbulent Flow Superheat Shell-and-Tube Evaporators Shell-and-Tube EvaporatorEvaporator Control Evaporator ControlFace-Split Arrangement Finned-Tube Evaporator Control80ºF Intertwined Arrangement Row-Split Arrangement Shell-and-Tube Evaporator Control Expansion Device Expansion DevicesTXV Control Thermostatic Expansion ValveTXV TXV TXV Operation Psia TXV Too much superheat Superheat SettingSolenoid Valve AccessoriesSolenoid Valve Period five Liquid-Line Filter Drier Liquid-Line Filter DrierSealed type Moisture-Indicating Sight Glass Moisture-Indicating Sight GlassSuction Line Filter Suction Line FilterHot Gas Muffler Hot Gas MufflerShutoff Valve Shutoff ValveAccess Port Access PortReview-Period One ReviewAir-cooled condenser Review-Period TwoReview-Period Four Review-Period ThreeReview-Period Five For more information, refer to the following references Questions for Period QuizQuiz To C To G AnswersGlossary Glossary Glossary Trane Company

trg-trc005-en specifications

The Trane TRG-TRC005-EN is a sophisticated and versatile HVAC control system designed for modern commercial buildings. As part of Trane's innovative lineup, this device offers advanced functionalities to enhance energy efficiency, comfort, and operational ease. The TRG-TRC005-EN is equipped with cutting-edge technologies that make it an essential tool for facility managers and HVAC professionals.

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