Product tab
Nominal Cooling Capacity
|
Default: Auto Size
|
|
Typical Range: 50 to 500 tons
|
|
Min/Max: 0 < X < 999,999
|
|
Units: W; kW; tons; Btuh; Mbh
|
This field specifies the nominal cooling capacity of the chiller.
Full Load Energy Rate
|
Default: 0
|
|
Typical Range: 2.9 to 3.1 COP
|
|
Min/Max: 0 to 999,999
|
|
Units: kW/ton; therms/ton-hr; Mbh/ton; kW/Mbh; kW/kW; COP; EER
|
This numeric input field is the chiller’s coefficient of performance. It should not include energy use due to pumps. This value should include the air cooled condenser fans if the Condenser fan field below is not used.
Optimum Part Load Ratio
|
Default: 100%
|
|
Typical Range: 10 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: 10 to 100%
|
|
Min/Max: 0 to 999,999
|
|
Units: %
|
The sizing factor is used when the capacity is selected as auto sized. The autosizing calculations are performed as usual and the results are multiplied by the sizing factor.
Design Water Temperatures
Design Leaving Chilled Water Temperature
|
Default: 44°F (6.67°C)
|
|
Typical Range: 44 to 45°F (6.67 to 7.2°C)
|
|
Min/Max: 20°F (-7°C)
|
|
Units: °F (°C)
|
This field contains the chiller’s leaving chilled water temperature.
Design Entering Condenser Air Temperature
|
Default: 95°F (35°C)
|
|
Typical Range: 85 to 95°F (29.4 to 35°C)
|
|
Min/Max: 75 to 120°F (23.8 to 48.8°C)
|
|
Units: °F (°C)
|
This field contains the chiller’s entering condenser fluid temperature. It represents the entering outdoor air dry-bulb.
Compressor
Compressor Type
|
Default: N/A
|
|
Typical Range: N/A
|
|
Min/Max: N/A
|
|
Units: N/A
|
This field defines the chiller’s type of compressor. The available options are: Generic Screw, Helical Rotary, Reciprocating and Scroll.
Compressor Heat Rejection Fraction
|
Default: 100%
|
|
Typical Range: 0 < X< 100%
|
|
Min/Max: 0 < X < 100%
|
|
Units: %
|
This input represents the fraction of compressor electrical energy consumption that must be rejected by the condenser. Enter a value of 1.0 when modeling hermetic chillers. For open chillers, enter the compressor motor efficiency.
Operational Limits
Leaving Chilled Water Temperature Low Limit
|
Default: 35.6°F (2°C)
|
|
Typical Range: N/A
|
|
Min/Max: 10 to 60°F (12.2 to 15.6°C)
|
|
Units: °F (°C)
|
This field contains the lower limit for the leaving chilled water temperature. This temperature acts as a cut off for heat transfer in the evaporator, so that the fluid doesn’t get too cold.
Condenser Fan
Condenser Fan Power Capacity Ratio
|
Default: 0.89 COP
|
|
Typical Range: N/A
|
|
Min/Max: 0 to 999,999
|
|
Units: COP; kW/ton; kW/kW
|
This field is used to model condenser fan power associated with air-cooled condensers. Enter the ratio of the condenser fan power to the reference chiller cooling capacity. If this input is greater than 0, the condenser fan power is modeled separately from the compressor power. In addition, if the condenser fan power is modeled using this input, the Full Load Energy Rate field and the performance curves should not include the condenser fan power.
Basin Heater
Condenser Type
|
Default: Air-cooled
|
|
Typical Range: N/A
|
|
Min/Max: N/A
|
|
Units: N/A
|
This field determines what type of condenser will be modeled with this chiller. Valid condenser types are Air-Cooled and Evaporatively Cooled.