Trane CVGF Application Considerations, Condenser Water Limitations, Temperature, Water Pumps

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Application Considerations

Condenser Water Limitations

Temperature

Trane centrifugal chillers start and operate over a range of load conditions with controlled water temperatures. Reducing the condenser water temperature is an effective method of lowering the chiller power input. However, the effect of lowering the condenser water temperature may cause an increase in system power consumption.

In many applications Trane centrifugal chillers can start and operate without control of the condenser water temperature. However, for optimum system power consumption, and for any applications with multiple chillers, control of the condenser water circuit is recommended. Integrated control of the chillers, pumps, and towers is easily accomplished with Trane’s AdaptiView and/or Tracer system.

Chillers are designed to ARI conditions of 29.4°C (85°F), but Trane centrifugal chillers can operate to a fi ve psig pressure differential between the condenser and evaporator at any steady state load without oil loss, oil return, motor cooling, or refrigerant hang-up problems. And this differential can equate to safe minimum entering condenser water temperatures at or below 12.8°C (55°F), dependent on a variety of factors such as load, leaving evaporator temperature, and component combinations. Startup below this differential is possible as well, especially with AdaptiView soft start features

Water Pumps

Avoid specifying or using 3600-rpm condenser and chilled water pumps. Such pumps may operate with objectionable noises and vibrations. In addition, a low frequency beat may occur due to the slight difference in operating rpm between water pumps and centrifugal motors. Where noise and vibration- free operation are important, Trane encourages the use of 1750 rpm pumps.

Water Flow

Today’s technology challenges ARI’s traditional design of three gpm per ton through the condenser. Reduced condenser fl ows are a simple and effective way to reduce both fi rst and operating costs for the entire chiller plant. This design strategy will require more effort from the chiller, but pump and tower savings will typically offset any penalty. This is especially true when the plant is partially loaded or condenser relief is available.

In new systems, the benefi ts can include dramatic savings with:

•Size and cost for condenser lines and valves

•Size and cost of the cooling tower

•Size and cost of the water pumps

•Pump energy (30% to 35% reduction)

•Tower fan energy(30% to 35% reduction)

Replacement chiller plants can reap even greater benefi ts from low-fl ow condensers. Because the water lines and tower are already in place, reduced fl ows would offer a tremendous energy advantage. Theoretically, a 2 gpm/ton design applied to a system that originally used 3 gpm/ton would offer a 70% reduction in pump energy. At the same time, the original tower would require a nozzle change but would then be able to produce about two degrees colder condenser water than before. These two benefi ts would typically offset any extra effort required by the chiller.

CTV-PRC001-E4

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Contents Model Cvgf Centrifugal Water ChillersIntroduction IntroductionIntroducing Trane’s Model Cvgf Centrifugal Water Chiller Contents Standard Cvgf Features Features and BenefitsAdditional Features and Benefits Features and BenefitsEnvironmental Features and Benefits At-a-glance status CD-ROM Features and Benefits Tracer TU InterfaceBuilding Automation and Chiller Plant Control Features and Benefits Tracer AdaptiViewTM ControllerIntegrated Comfort System ICS Chiller-Tower OptimizationTwo-Stage Compressors Surge Less and Later Why Centrifugal Compressors SurgeWater Pumps TemperatureApplication Considerations Condenser Water LimitationsWater Treatment Application ConsiderationsTable GD-1 Model Cvgf Description General Data60 Hz SI Units and English Units General DataJobsite Connections Supply and Motor Lead Wiring and ConnectionsShipment and Assembly Controls Standard FeaturesHot-Water Control ControlsExtended Operation Package Base-Loading ControlStandard Protections Phase Reversal/Rotation Protection Oil-Temperature ProtectionPhase-Unbalance Protection Phase-Loss ProtectionSurge Detection Protection High Motor-Winding Temperature ProtectionPower Factor and kW Measurement Current Overload ProtectionRestart Inhibit Free Starts Short-Cycling Protection60 Hz SI English Units Physical DimensionsModel Cvgf Water Connection Pipe Size Physical DimensionsMechanical Specifications Unit Control Panel Mechanical SpecificationsCondenser Painting Compressor-Motor StarterIsolation Pads Refrigerant and Oil ChargePSI Conversion Table
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CVGF specifications

The Trane CVGF series is a revolutionary innovation in the world of commercial HVAC systems, designed to deliver unparalleled performance and energy efficiency. This air-cooled chiller line is specifically engineered to meet the demands of modern buildings, making it an ideal choice for various applications such as offices, hospitals, and educational institutions.

One of the standout features of the CVGF series is its use of the Trane Adaptive Control technology. This advancement provides the system with real-time data analytics, allowing it to automatically adjust cooling output based on environmental conditions and load requirements. This level of adaptability not only enhances occupant comfort but also contributes to significant energy savings, aligning with sustainability goals.

The CVGF chillers also incorporate a robust and efficient scroll compressor, which operates quietly and minimizes vibration. This design choice ensures reliability and longevity while reducing operational noise levels, making it suitable for installations in noise-sensitive environments. Furthermore, the scroll compressor's efficiency plays a crucial role in achieving a higher coefficient of performance (COP), which translates to lower energy costs.

In terms of environmental responsibility, the CVGF series is designed with an eco-friendly refrigerant that supports lower global warming potential (GWP). Committed to sustainability, Trane ensures that these chillers not only meet but exceed regulatory requirements, allowing businesses to operate with a reduced carbon footprint.

Another remarkable characteristic of the CVGF line is its modular design, which simplifies installation and maintenance. The units are compact and can be easily integrated into existing infrastructure, minimizing disruption during upgrades or replacements. The straightforward maintenance protocols further enhance the system’s uptime, ensuring users enjoy consistent and reliable cooling performance.

Moreover, the CVGF chillers are equipped with advanced monitoring capabilities, accessible through Trane’s proprietary software. This feature enables facility managers to oversee system performance from any location, facilitating proactive adjustments and timely maintenance interventions.

Overall, the Trane CVGF series stands out as a cutting-edge solution for effective and sustainable cooling in commercial applications. By combining innovative technologies, energy-efficient design, and user-friendly features, the CVGF offers a comprehensive approach to achieving optimal climate control while meeting the challenges of the future.
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