Trane PKG-PRC002-EN manual Selection Example Design Conditions, Unit Selection

Page 13

Selection

Procedure Self-Contained

Selection Example

Design Conditions

Total gross capacity required = 420 MBh = 35.2Tons

Total sensible capacity required = 315 MBh

Entering air temperature = 80/67 Entering water temperature = 85 Water flowrate = 105 gpm Airflow = 14840 cfm at 2.5-inch

duct static pressure

Unit includes:

Inlet guide vanes Waterside economizer

Medium velocity throwaway filters

Unit Selection

Tentatively select a 35 ton unit Model SCWF 35.

Refer toTable PD-19 on page 43 to obtain gross total and sensible unit capacities, and gpm at the design conditions:

Total capacity = 419.0 MBh Sensible capacity = 309.0 MBh Leaving water temperature = 94.7 F

Since the design cfm is greater than the nominal cfm, adjust the capacities and condenser water delta T to reflect the higher cfm:

design cfm

14840

= +6% of nom. cfm

nominal

14000

 

cfm

 

 

Refer toTable PD-1 on page 31 to obtain the capacity correction factors for +6% of nominal cfm:

Cooling capacity multiplier = 1.009 Sensible capacity multiplier = 1.027

Multiply the capacities by the correction factors:

419 MBh x 1.009 = 422.8 MBh

309 MBh x 1.027 = 317.3 MBh The SCWF 35 meets the total and sensible design requirements.

Multiply the deltaT of 9.7 F, by the cooling capacity correction factor of 1.009 to obtain new delta T of 9.79 and add this to the entering water temperature to obtain the actual leaving water temperature of 94.79 F.

Determine static air pressure drops through the accessories at the design cfm from Chart PD-3 on page 22:

4-row waterside economizer = 0.37 in. Medium velocity filters = 0.28 in. add this to the 2.5 inch duct static pressure for a total external static pressure of 3.15 inches.

Refer to the fan curve with inlet guide vanes, Chart PD-38 on page 43, to determine approximate brake horsepower and fan rpm:

Fan brake horsepower = 16 bhp Fan rpm = 1020 rpm

Determine net capacities by subtracting fan motor heat from gross capacities:

2.8 x 16 bhp = 44.8 MBh

Net total capacity = 422.8 MBh - 44.8 MBh = 378.0 MBh

Net sensible capacity = 317.3 MBh - 44.8 MBh = 272.5 MBh

Determine waterside economizer capacity by referring toTable PD-17 on page 42. Use entering air of 80/67 and entering water temperature of 55 deg F at 105 gpm. The table provides a gross total capacity of 282.1 MBh and gross sensible capacity of 277.2 MBh and

60.4deg F leaving water temperature at nominal cfm.

Determine gross capacities at design cfm by applying the cfm correction factors from waterside economizer fromTable PD-1 on page 31. Use the following correction factors:

282.1MBh x 1.009 = 284.6 MBh

277.2MBh x 1.027 = 284.7 MBh

Apply the cooling correction factor to water delta T to determine new delta T of 5.45 F.

Determine net capacities by subtracting fan motor heat for net total capacity of

239.8MBh and net sensible capacities of

239.9MBh.

PKG-PRC002-EN

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Contents December Commercial Self-ContainedSignature Series Self-Contained Units IntroductionContents Features and Benefits Optional Features Standard FeaturesIntegrated Comfort System ICS Integrated Self-Contained SystemsTrane 3-DScroll Compressor Proven DesignThroughTesting and ResearchLow Torque Variation Return Air Ductwork Application Considerations Self-ContainedSupply Air Ductwork Equipment Room Location and OrientationCondenser Water Piping Isolation RecommendationsUnit Operating Limits Air Cooled ApplicationConsiderations CondenserSelection Procedure Self-ContainedUnit Capacities Waterside Economizer CapacityUnit Selection Selection Example Design ConditionsModel Number ProcedureDescription Self-Contained Model Number DescriptionSelf-Contained Accessory Model Number Description Remote Air-Cooled Condenser Model Number Description Tons General DataTable GD-3. SCWF/SIWF Water-Cooled Self-Contained, 42-80Tons Table GD-4. SCRF/SIRF Air-Cooled Self-Contained SCRF/SIRFCCRC/CIRC General DataTable GD-7. Self-Contained Heating Coil Heating CoilDrops Performance Chart PD-5. Airside Pressure DropData DropsHeating Coils Airside Pressure20 to 38 Ton Unit 42 to 80 Ton Unit Discharge PlenumAirside Pressure Airside Economizer with Standard Damper Airside Economizer with Traq Damper Waterside Chart PD-21. Waterside Pressure Drop SCWF/SIWF 35Pressure Drop SCWF/SIWF Table PD-1. CFM Capacity Correction Table Performance Water-Cooled Data20 Ton Water-CooledTable PD-2. SCWF/SIWF 20 Economizer Full Capacity 8,000 cfm Table PD-3. SCWF/SIWF 20 Economizer Low Capacity 8,000 cfmEntering WaterTemp Entering Air 75 F 85 F 95 F Table PD-5. SCWF/SIWF 22 Economizer Full Capacity 8,800 cfm 22 TonTable PD-6. SCWF/SIWF 22 Economizer Low Capacity 8,800 cfm EnteringWaterTemp Entering Air 75 F 85 F 95 F Table PD-9. SCWF/SIWF 25 Economizer Low Capacity 10,000 cfm 25 TonEntering Water Temp Entering Air 75 F 85 F 95 F Table PD-12. SCWF/SIWF 29 Economizer Low Capacity 11,600 cfm 29 Ton84.2 Table PD-15. SCWF/SIWF 32 Economizer Low Capacity 12,800 cfm 32 Ton94.5 Table PD-18. SCWF/SIWF 35 Economizer Low Capacity 14,000 cfm 35 Ton401 320 Table PD-21. SCWF/SIWF 38 Economizer Low Capacity 15,200 cfm 38 Ton434 373 Table PD-24. SCWF/SIWF 42 Economizer Low Capacity 16,800 cfm 42 Ton403 84.1 Table PD-27. SCWF/SIWF 46 Economizer Low Capacity 18,400 cfm 46 Ton83.8 Table PD-30. SCWF/SIWF 52 Economizer Low Capacity 20,800 cfm 52 Ton596 471 Table PD-33. Scwfsiwf 58 Economizer Low Capacity 23,200 cfm 58 Ton663 571 Table PD-36. SCWF/SIWF 65 Economizer Low Capacity 26,000 cfm 65 TonEntering Water Temp Entering Air Table PD-39. SCWF/SIWF 72 Economizer Low Capacity 28,000 cfm 72 Ton83.7 Table PD-42. SCWF/SIWF 80 Economizer Low Capacity 29,800 cfm 80 Ton891 761 Air-Cooled Table PD-45. SCRF/SIRF 25 Gross Cooling Capacity 11,600 cfm Table PD-46. SCRF/SIRF 29 Gross Cooling Capacity 12,800 cfm Table PD-47. SCRF/SIRF 30 Gross Cooling Capacity 14,000 cfm 30 TonTable PD-48. SCRF/SIRF 35 Gross Cooling Capacity 15,200 cfm Table PD-49. SCRF/SIRF 40 Gross Cooling Capacity 18,400 cfm 40 TonTable PD-50. SCRF/SIRF 50 Gross Cooling Capacity 23,200 cfm 50 TonData60-Ton Performance Air-CooledTable PD-51. SCRF/SIRF 60 Gross Cooling Capacity 29,800 cfm Heating Coils Self-ContainedTable PD-52. HotWater Heating Capacity Table PD-53. Steam Heating CapacityAvailable Input and Output Points ControlsIntelliPak Unit Features Standard IntelliPak Unit Control FeaturesHuman Interface Panel HI Main menus of the human interface panels areControls Operation SequenceControl Sequences Operation Gbas Analog Inputs Generic Building Automation System Module Gbas OptionGbas Binary Outputs Demand Limiting Binary InputAir-Cooled Condensers Airside OptionsWater Purge Inlet GuideVane ControlUnoccupied ZoneTemperature Control Cooling and Heating Occupied ZoneTemperature ControlHeating Electric Heating Hot Water or SteamSupply Air Setpoint Reset Supply Air Temperature Control Unit Sequence OperationSupply Air Tempering Hot Water and Steam Units Only Controls Options Zone SensorStandard On All Units Model Number Digit 6 = A, BAYSENS017Thermometer to indicate temperature in the zone Setpoint thumbwheel for local setpoint adjustment Electrical Data Selection ProceduresTable ED-6. Single Stage Electric Heat Electrical Data Electrical Data SCWF/SCRFTable ED-7. CCRC/CIRC Condenser Electrical Data Ton Self-Contained Dimensions Self-Contained Weights TonsDimensions Self-Contained Weights 40-80 Ton Discharge Dimensions English inches Detail B Discharge DimensionsDischarge Dimensions Metric mm Detail a Electrical ConnectionsCcrc Unit Dimensions Dimensions Air-Cooled Weights CondenserWeights DimensionsRefrigerant and Electrical Connections Front View Looking at Control PanelSteam Coil Hot Water CoilPlenum Dimensions English inches DimensionsPlenum Dimensions Metric mm Flexible Horizontal Discharge PlenumEconomizer AirsideAirside Economizer Airside Economizer Dimensions Metric mm Airside Economizer Dimensions English inchesAdjustment Field-InstalledZone Sensors Dual Setpoint, Manual/AutomaticFunction Lights Zone Temperature Sensor OnlyProgrammable Night-Setback Sensor Service/Code Clearance Requirements ServiceClearances Self-Contained ModelsTop View CCRC/CIRC 35 Top View CCRC/CIRC 20Top View CCRC/CIRC 50 Table W-1. Unit Weights SCWF/SCRF/SIWF/SIRF Dimensions WeightsTable W-2. Unit Weights CCRC/CIRC Table W-3. Variable Frequency Drive WeightsSignature Series Self Contained Units Mechanical Specifications Self-ContainedMechanical Air-CooledSpecifications Condenser Air Volume/Temperature Control Zone Temperature Control Mechanical Specifications OptionsSupply Air Temperature Control with Inlet GuideVanes Self-Contained OptionsStandard Two-Position Damper Interface Comparative Enthalpy ControlAirside Economizer Interface Airside Economizer Interface with Comparative EnthalpyService Valves Water Flow SwitchLow Entering Air Temperature Protection Device Non-fused Disconnect SwitchCoils Protective Coating CabinetCupro-Nickel Condenser Stainless Steel Drain PanLiterature Order Number

PKG-PRC002-EN specifications

The Trane PKG-PRC002-EN is a groundbreaking packaged rooftop unit designed to meet the diverse needs of commercial and industrial spaces. This model showcases Trane’s commitment to innovation, energy efficiency, and reliability, making it a preferred choice for HVAC professionals and building owners alike.

One of the main features of the PKG-PRC002-EN is its high-efficiency design. This unit leverages advanced technologies to minimize energy consumption while ensuring optimal cooling and heating performance. Its efficient compressor, coupled with enhanced heat exchangers, significantly reduces operating costs and energy bills, aligning with today’s sustainability goals.

The PKG-PRC002-EN features a robust and durable construction, which translates to enhanced longevity and reduced maintenance requirements. Designed for ease of installation, the unit is compact and lightweight, facilitating seamless retrofitting and integration into existing systems. Furthermore, its accessible service panels allow for straightforward maintenance and repairs, thus minimizing downtime and service disruptions.

Equipped with Trane's advanced control technology, the PKG-PRC002-EN offers precise temperature management, ensuring consistent comfort across different zones within a building. The intuitive controls enable users to program schedules and adjust settings based on their specific needs, enhancing comfort while maximizing efficiency.

The model also incorporates advanced filtration options, improving indoor air quality by effectively reducing pollutants and allergens. This focus on health and safety is essential, especially in commercial settings where air quality can significantly impact occupant well-being and productivity.

Another notable characteristic of the PKG-PRC002-EN is its low noise levels during operation, which is essential for maintaining a conducive indoor environment in workplaces, retail spaces, or educational institutions. The unit's design minimizes sound transmission, creating a more pleasant atmosphere for occupants.

In summary, the Trane PKG-PRC002-EN is a highly efficient, reliable, and user-friendly rooftop unit that combines advanced technology with robust construction. Its energy-saving features, superior air quality options, and focus on quiet performance make it an excellent choice for modern commercial HVAC applications, ultimately contributing to sustainable building practices and enhanced occupant comfort.
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