Product Tab
Nominal Cooling Capacity
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Default: Auto Size
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Typical Range: 50 to 500 tons
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Min/Max: 0 < X < 999,999
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Units: W; kW; Btuh; Mbh
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This field specifies the nominal cooling capacity of the chiller.
Full Load Energy Rate
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Default: 0
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Typical Range: 2.9 to 3.1 COP
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Min/Max: 0 to 999,999
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Units: kW/ton; therms/ton-hr; Mbh/ton; kW/Mbh; kW/kW; COP; EER
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This field is the chiller’s coefficient of performance.
Temperature Rise Coefficient
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Default: 2.778
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Typical Range: 2.778
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Min/Max: 0 to 999,999
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Units: N/A
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This field contains the electric chiller’s temperature rise coefficient which is defined as the ratio of the required change in condenser water temperature to a given change in chilled water temperature. This maintains the capacity at the nominal value and is calculated as the following ratio:
where:
TCEntrequired = required entering condenser air or water temperature to maintain rated capacity
TCEntrated = rated entering condenser air or water temperature at rated capacity
TELvrequired = required leaving evaporator water outlet temperature to maintain rated capacity
TELvrated = rated leaving evaporator water outlet temperature at rated capacity
Fuel Type
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Default: Natural Gas
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Typical Range: N/A
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Min/Max: N/A
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Units: N/A
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This field determines the type of fuel that the chiller uses. Fuel options are: NaturalGas, PropaneGas, Diesel, Gasoline, FuelOil#1, FuelOil#2, OtherFuel1 or OtherFuel2.
Optimum Part Load Ratio
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Default: 100%
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Typical Range: 10 to 100%
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Min/Max: 0 to 100%
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Units: %
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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
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Default: 100%
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Typical Range: 10 to 100%
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Min/Max: 0 to 100%
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Units: %
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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 Fluid Temperatures
Design Entering Condenser Air Temperature
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Default: 95°F (35°C)
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Typical Range: 85 to 95°F (29.4 to 35°C)
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Min/Max: 75 to 120°F (23.8 to 48.8°C)
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Units: °F (°C)
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This field contains the combustion turbine chiller’s condenser inlet design temperature.
Design Leaving Chilled Water Temperature
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Default: 44.1°F (6.67°C)
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Typical Range: 43 to 45°F (6.11 to 7.22°C)
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Min/Max: -130 to 158°F (-90 to 70°C)
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Units: °F (°C)
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This field contains the combustion turbine chiller’s evaporator outlet design temperature.
Operational Limits
Leaving Chilled Water Temperature Low Limit
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Default: 41°F (5°C)
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Typical Range: 34 to 41°F (1.11 to 5°C)
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Min/Max: -130 to 158°F (-90 to 70°C)
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Units: °F (°C)
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This numeric field contains the lower limit for the evaporator outlet temperature. This temperature acts as a cut off for heat transfer in the evaporator, so that the fluid doesn’t get too cold.
Gas Turbine
Nominal Engine Capacity
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Default: Auto Size
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Typical Range: Auto Size
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Min/Max: 0 to 99,999,999 kW
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Units: W; kW; tons; Btuh; Mbh
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This field contains the capacity of the gas turbine engine.
Exhaust Flow per Engine Capacity
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Default: 0.0000054 (kg/s)/W
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Typical Range: Depends on chiller performance
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Min/Max: 0 to 99,999,999 kW
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Units: (lb/hr)/W; (kg/s)/W
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This field contains the maximum exhaust gas mass flow rate per kilowatt of power out.
Design Steam Saturation Temperature
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Default: 302°F (150°C)
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Typical Range: Depends on chiller performance
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Min/Max: 212 to 420°F (100 to 215°C)
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Units: °F (°C)
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This field contains the design steam saturation temperature.
Fuel Higher Heating Value
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Default: 43,500 kJ/kg for Natural Gas
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Typical Range: Depends on fuel type
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Min/Max: 20267 to 22453 Btu/lb (47,130 to 52,210 kJ/kg)
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Units: Btu/lb; kJ/kg; J/kg
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Also known as the gross energy of a fuel or gross calorific value. This field contains the higher heating value of the fuel.
Basin Heater
Condenser Type
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Default: Air-cooled
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Typical Range: N/A
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Min/Max: N/A
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Units: N/A
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This field determines what type of condenser will be modeled with this chiller. Valid condenser types are Air-Cooled and Evaporative Cooled.