Trane TWE050A Selection Procedure, Cooling Capacity, Heating Capacity, Air Delivery Selection

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Selection Procedure

Cooling Capacity

Step 1 — Calculate the building’s total and sensible cooling loads at design conditions.

Step 2 — Size the equipment usingTable PD-1. Match the cooling loads at design conditions.

Example:The following are the building cooling requirements

a

Electrical Characteristics: 380-415/50/3 b

Summer Design Conditions: Entering

Evaporator Coil: 80 DB/67WB (27 DB/19WB°C)

Outdoor Ambient: 95°F (35° C) c

Total Cooling Load: 75 MBh (22kW) d

Sensible Cooling Load: 53 MBh (15.5 kW)

e

Airflow: 2500 cfm (4247 m3/h)

External Static Pressure: 0.77 in. wg (193 Pa)

Table PD-1 shows that aTWA075A matched with aTWE075A has a gross cooling capacity of 85.1 MBh (24.9 kW) and 60.8 MBh (17.8 kW) sensible capacity at 95 DB (35°C) ambient and 2500 cfm (4247 m3/h) and 80 DB/67WB (27 DB/19 WB) air entering the evaporator.

To find the net cooling capacities, fan motor heat must be subtracted. Determine the total unit static pressure:

External Static

0.77 in (193 Pa)

Standard Filter

0.10 in (25 Pa)

Supplementary Electric Heat

 

0.23 in (57 Pa)

Total Static Pressure

1.10 in (275 Pa)

Note:The Evaporator Fan Performance Table has included the effect of a 1 in. (250 Pa) filter already.Therefore, the actualTotal Static Pressure is 1.10 - 0.10 = 1.00 in. (275 - 25 = 250 Pa).

With 2500 cfm (4247 m3/h) and 1.00 inches (250 Pa),Table PD-15 shows a 1.07 bhp (0.8 kW).

Note:The formula below the table can be used to calculate Fan Motor Heat, Constant x Motor Power =

Fan Motor Heat

 

3.5 x bhp

=

MBh

3.5 x 1.07

=

3.75 MBh

1.375 x (kW) = kW

1.375 x 0.8 = 1.1 kW

NetTotal Cooling Capacity

= 85.1 MBh – 3.75 = 81.35 MBh

=24.9 kW - 1.1 = 23.8 kW Net Sensible Cooling Capacity

= 60.8 MBh – 3.75 = 57.05 MBh = 17.8 MBh - 1.1 = 16.7 kW

Heating Capacity

Step 1 — Calculate the building heating load using theTrane calculation form or any other standard accepted method.

Step 2 — Size the equipment usingTable PD-9 to match the heating loads at design conditions.The following are building heating requirements:

a

Total Heating Load: 110 MBh (32.2 kW) b

Outdoor Ambient (Winter): 17°F (-8.3°C) DB

c

Indoor ReturnTemperature: 70°F (21.1°C) DB

d

Airflow: 2500 cfm (4247 m3/h)

Table PD-9 indicates the mechanical heating portion of the heat pump will provide 49.1 MBh (14.4 kW) for the winter design conditions.

Step 3 — Because 49.1 MBh (14.4 kW) is less than the building’s required heating capacity, a supplementary heater must be selected. 110 - 49.1 = 60.9 MBh (32.2 -

14.4= 17.8 kW) minimum heater capacity.

FromTable PD-25, the 24.22 kW heater has a capacity of 82,670 Btu. FromTable ED-5, the 24.22 kW heater at 400V indicates the heater model number is BAYHTRL435A.This heater will be adequate to cover the residual heat capacity needed for the application.

Air Delivery Selection

External static pressure drop through the air distribution system has been calculated to be 0.77 inches (192.5 Pa) of water gauge. FromTable PD-24 static pressure drop through the electric heater is 0.12 inches (30 Pa) of water (0.77 + 0.12

=.89 in.) (192.5 + 30 = 222.5 Pa). Enter Table PD-15 forTWE090A4 at 2500 cfm (4247 m3/h) and .90 in. (225 Pa) static pressure.The standard motor at 790 rpm will give the desired airflow.

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Contents Split System Heat Pumps Filters Manufacturing ControlDesigning the Details Standardized CabinetsContents Low Ambient Cooling Operation Features and BenefitsOdyssey a Complete Split System Clearance Requirements Application ConsiderationsBlower Rotation Air Delivery Selection Selection ProcedureCooling Capacity Heating CapacitySplit System Heat Pump Model Nomenclature Model Number DescriptionAir Handler Model Nomenclature Heat Pumps General DataTable GD-1 General Data Heat Pumps Number Type 3D Scroll No. Motors Motor HP Motor RPM, kW Condensing Unit Power kWTable GD-2 General Data Heat Pumps Condensing Unit Only 2, Btu kWTable GD-3 General Data Air Handlers Air HandlersTable GD-3 General Data DataSystem Performance120.5 125.299.3 109.5119.6 99.3 105 115Dry EnteringWet Bulb F 4500223.9 115 105 Enter Dry161.9 216.2DataTWA075A DataTWA100A ODTemp Suction ReferenceTemperature CTWA100A Heat Pump Only SI TWA155B Heat Pump Only SI DataTWA155BTWA200B Heat Pump Only SI DataTWA200BOutdoor Outdoor Heating Capacity Btu/1000 AtTemperature 20.1 Indicated Indoor Dry BulbTemperatureOutdoor Heating Capacity BTUH/1000 At 15.6DataSystem Table PD-13- Evaporator Fan Performance TWE050A SI Performance DataAir Handler Table PD-13 Evaporator Fan Performance TWE050A I-PTable PD-16 Blower Speeds TWE075A Table PD-15 Evaporator Fan Performance TWE075A I-PTable PD-15 Table PD-15 Evaporator Fan Performance TWE075A SITable PD-17 Table PD-17 Evaporator Fan Performance TWE100A, TWE100B I-PTable PD 18 Blower Speeds TWE100A,TWE100B KW RPM Table PD-19 Evaporator Fan Performance TWE155B I-PTable PD-19 Evaporator Fan Performance TWE155B SI Table PD-20- Blower Speeds TWE155BTable PD-22 Blower Speeds TWE200B Table PD-21- Evaporator Fan Performance TWE200B I-PTable PD-21 Table PD-21- Evaporator Fan Performance TWE200B SI2200 Unit Louver Angle Deflection Position Model NoStraight 1400 TWE050 1800Table PD-25 Auxiliary Electric Heat Capacity Air Handler Electrical Data Table ED-1- Electrical Characteristics Motors Air HandlerTable ED-2 UnitWiring Air Handler Table ED-4 UnitWiring Heat Pumps17.31 Heater34.62 2TWA075A/TWE155B Jobsite ConnectionsTWA050/TWE050 TWA075A/TWE075AHeat Pump Single Compressor Typical WiringHeat Pump Heat Pump Dual Compressors Typical Air Handler Air HandlerFigure DD-1 TWA075 Heat Pump DimensionalFigure DD-2 10TonTWA100A Heat Pump Dimensional DataFigure DD-3 TWA155B Heat Pump Figure DD-4 TWA200B Heat Pump Figure DD-5 TWE050AAir Handlers Figure DD-6 -TWE075A Air Handler Figure DD-7-TWE100A Air Handler Figure DD-8-TWE100B Air Handler 905 Table DD-1 Air Handler Dimensions in. mm878 Figure DD-10- TWE155B Air Handler Figure DD-11 -TWE200B Air Handler Table DD-2- Air Handler Dimensions in. mm Table DD-2 Air Handler Dimensions in. mmDataAccessories Mechanical Specifications Evaporator Fan Evaporator CoilPage Page Literature Order Number Trane

TWA200B, TWA075A, TWE200B, TWE050A specifications

Trane has a long-standing reputation for manufacturing high-efficiency heating, ventilation, and air conditioning (HVAC) systems. Among their impressive lineup are the Trane TWA200B, TWE050A, TWA075A, and TWE200B models, each designed with advanced technologies that cater to various residential and commercial needs.

The Trane TWA200B is a powerful 2-ton air handler equipped with a variable-speed blower that enhances energy efficiency and provides consistent airflow. With a compact design, it fits well in tight spaces while delivering superior indoor comfort. One of its notable features is its compatibility with Trane's ComfortLink II Zoning System, allowing for customized temperature control in different zones of a building. This model is optimized for use with high-efficiency heat pumps and has enhanced filtration options that improve indoor air quality by trapping dust, pollen, and other allergens.

The TWE050A is a 5-ton packaged air conditioning unit that integrates both cooling and heating capabilities. This model is particularly praised for its high SEER (Seasonal Energy Efficiency Ratio) rating, which indicates superior energy efficiency and reduced operational costs. The TWE050A utilizes Trane's proprietary Spine Fin coil technology, which maximizes surface area for better heat exchange and overall efficiency. Its durable construction ensures long-lasting performance in various weather conditions, making it ideal for both residential and light commercial applications.

The TWA075A is a versatile 7.5-ton air handler designed for larger spaces. It features a robust construction and is equipped with a multi-speed blower that can be adjusted to meet specific airflow requirements, ensuring optimal comfort. This model is notable for its sound attenuation features, which minimize operational noise, making it suitable for quiet environments. Additionally, the TWA075A supports advanced thermostat compatibility, enabling users to maintain precise control over indoor temperatures.

Finally, the TWE200B stands out as a 20-ton packaged rooftop unit, making it an excellent choice for extensive commercial applications. Its advanced compressor technology ensures effective cooling and heating while maintaining high energy efficiency. The TWE200B includes enhanced connectivity options, allowing for remote monitoring and control through smart devices. This model also incorporates Trane's Integrated Comfort System, which streamlines operation and simplifies maintenance tasks.

Overall, the Trane TWA200B, TWE050A, TWA075A, and TWE200B models embody the company's commitment to quality, innovation, and energy efficiency, making them excellent choices for a wide array of HVAC applications.
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