Trane Modular 20 to 35 Tons Liste des pièces Page 18
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- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
18 PKG-PRC003U-EN
Selection Procedure
Selection Procedure
Airflow = 14200 cfm at 2.5-inch duct static pressure
Unit to include:
Constant Volume
Waterside economizer
Medium velocity throwaway filters
Unit Selection
Tentatively select a 35 ton unit. Refer to Table 13, p. 36 to obtain gross total and sensible unit
capacities, and gpm at the design conditions:
Total capacity = 370 MBh
Sensible capacity = 282 MBh
LWT = 95.4°F
Since the design cfm is greater than the nominal cfm, adjust the capacities and condenser water
deltaT to reflect the higher cfm:
design cfm/nominal cfm 14,240/14,000 + 3% from nom. Cfm
Refer to Table 6, p. 29 to obtain the capacity correction factors for +3% of nominal cfm:
Cooling capacity multiplier = 1.005
Sensible capacity multiplier = 1.014
Multiply the capacities by the correction factors:
370 MBh x 1.005 = 371.85 MBh
282 MBh x 1.014 = 285.95 MBh
The SCWG 35 meets the total and sensible design requirements.
Multiply the deltaT of 10.4°F, by the cooling capacity correction factor of 1.005 to obtain new delta
T of 10.45 and add this to the entering water temperature to obtain the actual leaving water
temperature, 95.45°F.
Determine static air pressure drops through the accessories at the design cfm by referring to
Figure 6, p. 25 through Figure 11, p. 27.
4-row waterside economizer = 0.55 in. Medium velocity filters = 0.41 in. Add this to the 2.5-inch duct
static pressure for a total external static pressure of 3.46 inches. Refer to the fan curve with Constant
Volume, Figure 18, p. 37 to determine approximate brake horsepower and fan rpm:
Fan brake horsepower = 25 bhp
Fan rpm = 1850 rpm
Determine net capacities by subtracting fan motor heat from gross capacities:
2.8 x 25 bhp = 70.0 MBh
Net total capacity = 371.85 MBh - 70.0 MBh = 301.85 MBh
Net sensible capacity = 285.95 MBh - 70.0 MBh = 215.95 MBh
Determine waterside economizer (full coil) capacity by referring to Table 13, p. 36. Use entering air
of 80/67°F and entering water temperature of 55°F at 105 gpm.The table provides a gross total
capacity of 263.6 MBh and gross sensible capacity of 263.6 MBh and 60.0°F leaving water
temperature at nominal cfm.
Determine gross capacities at design cfm by applying the cfm correction factors from waterside
economizer from Table 6, p. 29. Use the following correction factors:
263.6 MBh x 1.005 = 264.92 MBh
263.6 MBh x 1.014 = 267.29 MBh
Apply the cooling correction factor to water deltaT to determine new deltaT of 5.03°F.
Determine net capacities by subtracting fan motor heat for net total capacity of 194.92 MBh and net
sensible capacities of 197.29 MBh.
- Product Catalog 1
- Introduction 2
- Table of Contents 3
- 6 PKG-PRC003U-EN 6
- Enhanced Serviceability 7
- Standard Features 7
- Standard Control Features 7
- Optional Features 8
- Field Installed Accessories 8
- Features and Benefits 10
- Interoperability with BACnet 10
- LowTorque Variation 11
- Suction Gas Cooled Motor 11
- Application Considerations 12
- Isolation Recommendations 14
- Condenser Water Piping 15
- 16 PKG-PRC003U-EN 16
- Selection Procedure 17
- Unit Selection 18
- Model Number Descriptions 19
- Self-Contained Ship 21
- With Accessory 21
- Model Number 21
- Remote Air-Cooled 21
- Condenser 21
- General Data 22
- Performance Data 25
- Waterside Pressure Drop 28
- Water-Cooled Unit Performance 30
- 25-ton Water-Cooled 32
- 30-ton Water-Cooled 34
- 35-ton Water-Cooled 36
- Air-Cooled Unit Performance 38
- 25-ton Air-Cooled 39
- 32-ton Air-Cooled 40
- Heating Performance 41
- Controls 42
- Analog inputs 43
- Binary inputs 43
- Binary output 43
- Human Interface Panel (HI) 44
- Morning Warmup 45
- Ventilation Override (VOM) 45
- Demand Limiting Binary Input 47
- 48 PKG-PRC003U-EN 48
- Airside Options 49
- Cooling/Airside Economizer 50
- Heating: Electric 50
- Supply Air Tempering 50
- PKG-PRC003U-EN 51 51
- 52 PKG-PRC003U-EN 52
- Zone Sensor Options 53
- CV: BAYSENS108 54
- CV: BAYSENS110 54
- BAYSENS074 55
- BAYSENS073 55
- Electrical Data 56
- Dimensions and Weights 59
- DETAIL A 71
- DETAIL B 71
- MOUNTING BASE 71
- SEE DETAIL A 71
- DETAIL A 75
- DETAIL B 75
- Service Clearances 78
- Mechanical Specifications 79
- 80 PKG-PRC003U-EN 80
- IntelliPak™ Control Options 81
- Comparative Enthalpy Control 82
- Airside Economizer Interface 82
- PKG-PRC003U-EN 83 83
- 84 PKG-PRC003U-EN 84
- PKG-PRC003U-EN 85 85
- 86 PKG-PRC003U-EN 86
- Protective Coating Option 87
- Low Ambient Damper Option 87
- Louvered Coil Guards Option 87
- Agency Listing 87
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