Trace 3D Plus
User Guide
 
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Product tab

 
Nominal Cooling Capacity
Default: Auto Size
Typical Range: Auto Size
Min Max: 0 to 999,999
Units: W; kW; tons; Btuh; Mbh
This numeric field contains the nominal cooling capacity of the chiller.
 
Optimum Part Load Ratio
Default: 100
Typical Range: 0 to 100
Min Max: 0 to 100
Units: %
This numeric field contains the chiller’s optimum part-load ratio. This is the part-load ratio at which the chiller performs at its maximum COP.
 
Sizing Factor
Default: 100%
Typical Range: 0 to 100
Min Max: 0 to 100
Units: %
This field allows you to specify a sizing factor for this chiller. The sizing factor is used when the chiller is autosize. The sizing factor affects the following calculations: Nominal Cooling Capacity, Nominal Absorption pump power, Design Chilled Water Flow Rate, Design Condenser Water Flow Rate and Design Generator Fluid Flow Rate. Sizing Factor allows to size a component to meet part of the design load while continuing to use the autosizing feature.
 
Absorption Pump
Full Load Power
Default: Auto Size
Typical Range: Auto Size
Min Max: 0 to 999,999
Units: W; kW; Btuh; Mbh
This field represents the nominal pumping power of the chiller.
 
Design Water Temperatures
Design Entering Condenser Water Temperature
Default: 86°F (30°C)
Typical Range: 86°F (30°C)
Min Max: -130 to 158°F (-90 to 70°C)
Units: °F; °C
This field represents the temperature of the water entering the chiller’s condenser when operating at design conditions. This is the temperature delivered by the cooling tower.
 
Entering Condenser Water Temperature Low Limit
Default: 59°F (15°C)
Typical Range: 59°F (15°C)
Min Max: 59°F (15°C)
Units: °F; °C
This field contains the chiller’s condenser entering water temperature lower limit. No correction to chiller capacity is made for low condenser entering water temperatures.
 
Leaving Chilled Water Temperature Low Limit
Default: 41°F (5°C)
Typical Range: 41°F (5°C)
Min Max: 41°F (5°C)
Units: °F; °C
This field contains the chiller’s evaporator leaving water temperature lower limit. No correction to chiller capacity is made for low evaporator leaving water temperatures.
 
Entering Generator Fluid Temperature Low Limit
Default: 86°F (30°C)
Typical Range: 86°F (30°C)
Min Max: 86°F (30°C)
Units: °F; °C
This field contains the generator’s entering water temperature lower limit.  This field is not used if the chiller is connected to a steam plant in the project.
 
Steam Operating Conditions
Leaving Subcooling Temperature
Default: 33.8°F (1°C)
Typical Range: 33.8°F (1°C)
Min Max: 32 to 68°F (0 to 20°C)
Units: °F; °C
Ideally the steam trap located at the outlet of generator should remove all the condensate immediately, however there is a delay in this process in actual systems which causes the condensate to Subcool by a certain degree before leaving the generator. This amount of subcooling is included in the heat transferred to the solution in the generator.
 
Condensate Subcool Temperature
Default: 32°F (0°C)
Typical Range: 32°F (0°C)
Min Max: 32°F (0°C)
Units: °F; °C
This field represents the heat loss to the atmosphere due to uninsulated condensate return piping to the boiler. Condensate return piping operates at atmospheric pressure and is not insulated. The condensate subcools to a certain degree before it is pumped back to the boiler.