Trane ctv-prc007-en manual System Options, Heat Recovery

Page 23

System

 

Options

Heat Recovery

Heat Recovery

Use of the Heat Recovery CenTraVac™ can significantly reduce the energy operating costs of many buildings by using heat which normally would be rejected to the atmosphere. Typical uses for this heat are perimeter zone heating, reheat air conditioning systems and any hot water requirements. Any building with a simultaneous heating and cooling load is a potential candidate.

Most heating applications require water temperatures higher than the

85°F to 95°F typically sent to the cooling tower. Therefore, most heat recovery chillers are required to produce higher leaving condenser water temperatures, and thus will not duplicate the energy efficiencies of cooling-only machines. Figure O-7 illustrates the typical operating cycles of a cooling-only machine and a heat recovery machine. The most noticeable differences are:

1 The pressure differential provided by the compressor is much greater for the heat recovery cycle.

2 The amount of heat rejected from the heat recovery condenser is greater than that which would be rejected in cooling-only operation.

3 There is a decrease in the refrigeration effect. (RE) Higher condensing pressures increase the intermediate pressure in the economizer. Therefore, the liquid in the economizer has a higher enthalpy during the heat recovery mode than during standard chiller operation and the refrigeration effect is slightly decreased. Because of this decreased refrigeration effect, the compressor must pump more gas per ton of refrigeration.

The effect of this increased pressure differential and decreased refrigeration effect is a heat recovery machine which has a higher kW/ton energy consumption during heat recovery operation.

Typical catalog kW/ton for heat recovery machines operating in the heat recovery mode range from .64 to .84 kW/ton compared to a range of .61 to .79 for a cooling-only machine. Not only can there be an energy consumption penalty

paid due to the inherent differences in operating cycles for heat recovery machines, but traditional machine design can add to that energy handicap. In the past, a heat recovery machine’s operating efficiency was normally penalized year- round by having the capability to produce high heating water temperatures. Impellers are selected to produce the maximum required refrigerant pressure difference between the evaporator and condenser,

Figure O-8. Usually, that meant the impeller diameters were determined by the heat recovery operating conditions.

During cooling-only operation, the condensing pressures and temperatures are normally lower than during the heat recovery operation. So, in essence, the impeller diameters were oversized. This would result in a compressor efficiency during cooling- only season which was lower than if the impellers had been selected for a cooling-only application.

The multi-stage compressor and advanced impeller design on the CenTraVac™ chiller reduce this costly energy penalty. Neither the capacity nor the power consumption changes substantially as the heat recovery operating conditions divert from the cooling-only condition. The multi-stage compressor allows a closer match of impeller size to the operating condition. In addition, the computer designed impellers and crossover are designed to reduce losses as the kinetic energy of the refrigerant gas is converted to static pressure.

These advances make the Trane Heat Recovery CenTraVac™ chillers even more attractive now than in the past.

•The CenTraVac heat recovery chiller was designed for efficient operation with kW/ton efficiencies among the best in the industry for heat recovery chillers.

•The energy penalty paid in the past to operate a heat recovery machine in the cooling-only mode is essentially eliminated.

CTV-PRC007-EN

23

Page 22 Page 24
Image 23
Page 22 Page 24
Contents CenTraVac Liquid Chillers Emissions Chiller IntroductionWorld’s Most Efficient LowestContents Tradition of Innovation Trane HermeticCentrifugal Water ChillersLhcv CenTraVac Modular Chiller system IntroductionLow Pressure FeaturesBenefits AttributesCapabilities include ControlPanel Operator Control PanelBenefits Components FeaturesStandard Features and and Optional Benefits FeaturesStandard Features Optional FeaturesFactory Features and Performance Benefits TestingFactory Testing for Assured Performance CenTraVac Chiller Operating Cycle RefrigerationCycle Two-Stage CenTraVac P-H Diagram Starter UnitOptions Unit MountedOperation FeaturesReliability Integral Bypass Contactors Available options includeLarge number of part-load operating hours annually AdaptiveFrequency Drives BenefitsHigh kW Charges Condenser water temperature relief of chilled water resetEase of Operation Ease of InstallationUnit Free CoolingFigure O-5 Compressor Operation Schematic Auxiliary Condenser System Auxiliary Options CondenserControls SystemAuxiliary CondenserIce Storage SystemSystem Options Heat RecoverySystem Design Considerations Heat RecoveryCont Simultaneous Heating and CoolingChilled Water ResetChilled Water Reset Chilled water For Applications Requiring Tons 60 Hz Choose Lhcv ApplicationConsiderations Electrical Information Condenser Water LimitationsSelection Procedure Evaporator and Condenser Data Tables Roughing-in DimensionsPart Load Performance Flow Rates PerformanceData EvaporatorMinimum/Maximum Condenser Flow Rates GPM Jobsite Connections Supply and Motor Lead Wiring and ConnectionsShipment and Assembly Systems Performance ControlsAdvanced Controls Building Automation and Chiller Plant Control Controls ControlChiller Plant Machine Protections Functions Controls ProtectionsControl Functions Functions Controls Diagnostics Modules ControlsModules/Sequence OperationUnit is Running Capacity Limited by High Current Hz Compressors WeightsCvhg English Units DimensionsPhysical SI Units ML &LL 10630 3867 4080 4724 1327 4578 2908 2419 2632 Waterbox Physical Connection Dimensions ArrangementWaterbox Lengths English Units Physical DimensionsWaterbox Lengths Metric Units Evaporator Mechanical SpecificationCompressor Unit Control Panel Condenser/Heat Recovery CondenserEconomizer Purge SystemInsulation Isolation PadsRefrigerant and Oil Charge Thermometer Wells and Sight GlassesInput Line Reactor Option AFD Design FeaturesTrane Adaptive Frequency Drive AFD Environmental ratingsTrane Company is a participant in the Green Seal Program

ctv-prc007-en specifications

The Trane CTV-PRC007-EN is an advanced air conditioning unit that epitomizes efficiency and reliability in temperature control. Designed for commercial and industrial applications, this unit stands out with a multitude of features aimed at enhancing performance, energy savings, and sustainability.

One of the key characteristics of the CTV-PRC007-EN is its high cooling and heating capacities, allowing it to cater to a variety of environments. The unit utilizes a scroll compressor, known for its energy efficiency and durable design, which contributes to substantial energy savings over time. The inclusion of variable speed technology further optimizes energy use by adjusting to the specific cooling or heating demands of the space.

Equipped with Trane’s proprietary Sintesis technology, the CTV-PRC007-EN offers superior temperature control while minimizing noise levels. This feature makes it ideal for settings where quiet operation is essential, such as offices, hotels, and conference rooms. The unit’s sound-dampening design reduces operational noise, ensuring a comfortable environment for occupants.

Another significant advantage of the CTV-PRC007-EN is its advanced control system. The integration of Smart Temperature Management allows for precise monitoring and adjustment, enhancing the overall user experience. Additionally, the system is compatible with various building management systems, enabling remote monitoring and control, which can significantly reduce operational costs and improve efficiency.

The CTV-PRC007-EN also embraces eco-friendly refrigerants, aligning with global sustainability goals. By using refrigerants with low global warming potential, Trane demonstrates its commitment to reducing environmental impact while maintaining high performance.

Maintenance is straightforward with the CTV-PRC007-EN. The unit's robust design includes accessible components that simplify servicing, helping to minimize downtime and operational costs. It comes with a comprehensive warranty, underscoring Trane’s confidence in the durability and reliability of its products.

In conclusion, the Trane CTV-PRC007-EN stands as a testament to cutting-edge technology in HVAC solutions. With its energy efficiency, advanced control systems, quiet operation, and eco-friendly features, it is an ideal choice for businesses seeking effective climate control solutions that do not compromise on sustainability or performance.
Top Page Image Contents