Trane CVGF Condenser Water Limitations, Temperature, Water Pumps, Water Flow, Water Treatment

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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 applicationsTrane 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 withTrane’s CH530 and/ orTracer system.

Chillers are designed to ARI conditions of 29.4°C (85°F), butTrane centrifugal chillers can operate to a five psig pressure differential between the condenser and evaporator at any steady state load without oil loss, oil return, motor cooling, 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. Start-up below this differential is possible as well, especially with CH530 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, The Trane Company 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 flows are a simple and effective way to reduce both first 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 benefits 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 benefits from low flow condensers. Because the water lines and tower are already in place, reduced flows 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 benefits would again typically offset any extra effort required by the chiller.

Contact your localTrane Sales Office for information regarding optimum condenser water temperatures and flow rates for a specific application.

Water Treatment

The use of untreated or improperly treated water in a chiller may result in scaling, erosion, corrosion, algae or slime. It is recommended that the services of a qualified water treatment specialist be used to determine what treatment, if any, is advisable.The Trane Company assumes no responsibility for the results of untreated, or improperly treated water.

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Contents Centrifugal Water Chillers Introduction IntroductionContents Environmental Features and Benefits Features and BenefitsStandard Cvgf Features Additional Features and BenefitsMicroprocessor Controls with CH530 DynaView Operator InterfaceServiceability TechViewSoft Loading Feedforward Adaptive ControlFast Restart Chiller-Tower Optimization Two-Stage Compressor Widens the Application Range Why Centrifugal Compressors SurgeTwo-Stage Compressors Surge Less and Later Water Pumps TemperatureCondenser Water Limitations Water FlowGeneral Data Table GD-1 Model Cvgf DescriptionGeneral English UnitsShipment and Assembly Jobsite ConnectionsHeat Exchanger Control Standard FeaturesField Connection Motor Control and Compressor ProtectionBase-Loading Control Controls FeaturesExtended Operation Package Hot-Water ControlTracer Chiller Controller Oil-Temperature ProtectionPhase-Loss Protection Loss of Water-Flow ProtectionCurrent Overload Protection Momentary Power LossHigh Motor-Winding Temperature Protection Surge Detection ProtectionDimensions PhysicalPhysical Dimensions Model Cvgf Water Connection Pipe SizeMechanical Specifications Unit Control Panel Painting Isolation PadsRefrigerant and Oil Charge InsulationLength Energy and Power and Capaclty ConversionServicing of equipment referred to in this publication
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Manual 28 pages 34 b

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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