Boilers
In this section, you can view, create a new boiler library member, or copy and modify an existing boiler library member. Note you cannot modify or delete a standard TRACE® 3D Plus library member.
For additional information, you may view the EnergyPlus Input Output Reference documentation referenced throughout the sections below.
There are two types of boiler equipment library members to select from, where each type has its own set of equipment curves.
Hot Water
Product tab
The hot water boiler library members contain the following input field options.
Nominal Heating Capacity
|
Default: Autosize
|
|
Typical Range: Autosize
|
|
Min Max: 0 to 1,000,000,000,000,000
|
|
Units: Btuh, kW, MBh, tons, W
|
This numeric field contains the nominal operating capacity of the boiler.
Full Load Efficiency
|
Default: 90%
|
|
Typical Range: N/A
|
|
Min Max: 0 to 100%
|
|
Units: %
|
This numeric field contains the full load efficiency of the boiler.
Fuel Type
|
Default: Electricity
|
|
Typical Range: N/A
|
|
Min Max: N/A
|
|
Units: Electricity, Diesel, Gasoline, NaturalGas, Coal, PropaneGas, FuelOil1, FuelOil2
|
This field specifies the type of fuel used by the boiler for energy and economics analysis.
Optimum Part Load Ratio
|
Default: 100%
|
|
Typical Range: N/A
|
|
Min Max: 0 to 100%
|
|
Units: %
|
This numeric field contains the boiler optimum part load ratio. Note this is the part load ratio at which the boiler performs at its maximum efficiency.
Sizing Factor
|
Default: 100%
|
|
Typical Range: N/A
|
|
Min Max: 0 to 1,000,000,000,000
|
|
Units: %
|
This numeric field contains the sizing factor for the boiler. The sizing factor field is used when the design inputs are set to Auto Sized, where the calculations are performed as usual, but the results for nominal capacity and design water flow rate are multiplied by the specified sizing factor. This allows for users to size components to meet part of the design load, but also use the autosize feature.
Design Water Temperature
Design Leaving Hot Water Temperature
|
Default: 178°F / 81°C
|
|
Typical Range: N/A
|
|
Min Max: -1,000,000,000,000,000 to 1,000,000,000,000
|
|
Units: °F/°C
|
This numeric field contains the boiler leaving hot water temperature at design.
Miscellaneous Power
Parasitic Electric Load
|
Default: 0 W
|
|
Typical Range: N/A
|
|
Min Max: 0 to 1,000,000,000,000,000
|
|
Units: hp, kW, W
|
This numeric field contains the parasitic electric load consumed by an electrical device associated with the boiler whenever the boiler is operating.
Operational Limits
Leaving Hot Water Temperature High Limit
|
Default: 212°F / 100°C
|
|
Typical Range: N/A
|
|
Min Max: -1,000,000,000,000,000 to 1,000,000,000,000,000
|
|
Units: °F/°C
|
This numeric field contains the leaving hot water temperature high limit.
Curve Variable
Boiler Efficiency Curve Variable
|
Default: Leaving Temperature
|
|
Typical Range: N/A
|
|
Min Max: N/A
|
|
Units: Entering Temperature, Leaving Temperature
|
This is the hot water temperature used to evaluate the boiler efficiency curve.
Curve tab
The hot water boiler curves contain the following input field options, where the number of coefficients depends on the curve type selected. For example, a linear curve comes with two coefficient input field options by default:
Curve Type
|
Default: Linear
|
|
Types: Linear, QuadLinear, Bicubic, Cubic
|
|
Min Max: N/A
|
|
Units: %
|
Curve type associated with the equipment.
Load (Cycle Point)
|
Default: 100%
|
|
Typical Range: N/A
|
|
Min Max: 0 to 100%
|
|
Units: %
|
Represents the percentage (%) of full load capacity at which the equipment will turn on and off (cycle) to satisfy the load.
Coefficient 1
|
Default: 1
|
|
Typical Range: N/A
|
|
Min Max: N/A
|
|
Units: N/A
|
The default coefficient 1 value for a linear curve type is one.
Coefficient 2
|
Default: 0
|
|
Typical Range: N/A
|
|
Min Max: N/A
|
|
Units: N/A
|
The default coefficient 2 value for a linear curve type is zero
Steam
Product tab
The steam boiler library members contain the following input field options:
Nominal Heating Capacity
|
Default: Autosize
|
|
Typical Range: Autosize
|
|
Min Max: 0 to 1,000,000,000,000,000
|
|
Units: Btuh, kW, MBh, tons, W
|
This numeric field contains the nominal operating capacity of the boiler.
Full Load Efficiency
|
Default: 90%
|
|
Typical Range: N/A
|
|
Min Max: 0 to 100%
|
|
Units: %
|
This numeric field contains the full load efficiency of the boiler.
Fuel Type
|
Default: Electricity
|
|
Typical Range: N/A
|
|
Min Max: N/A
|
|
Units: Electricity, Diesel, Gasoline, NaturalGas, Coal, PropaneGas, FuelOil1, FuelOil2
|
This field specifies the type of fuel used by the boiler for energy and economics analysis.
Optimum Part Load Ratio
|
Default: 100%
|
|
Typical Range: N/A
|
|
Min Max: 0 to 100%
|
|
Units: %
|
This numeric field contains the boiler optimum part load ratio. Note this is the part load ratio at which the boiler performs at its maximum efficiency.
Sizing Factor
|
Default: 100%
|
|
Typical Range: N/A
|
|
Min Max: 0 to 1,000,000,000,000,000%
|
|
Units: %
|
This numeric field contains the sizing factor for the boiler. The sizing factor field is used when the design inputs are set to Auto Sized, where the calculations are performed as usual, but the results are multiplied by the specified sizing factor. This allows for users to size components to meet part of the design load, but also use the autosize feature.
Design Steam Conditions
Design Leaving Steam Temperature
|
Default: 239°F / 115°C
|
|
Typical Range: N/A
|
|
Min Max: -1,000,000,000,000,000 to 1,000,000,000,000,000
|
|
Units: °F/°C
|
Design Pressure
|
Default: 150 psig / 1034.10 kPa
|
|
Typical Range: N/A
|
|
Min Max: -1,000,000,000,000,000 to 1,000,000,000,000,000
|
|
Units: psig, ftH2O, kPa, Pa
|
This numeric field contains the maximum design pressure at which the boiler operates.
Curve tab
The steam boiler curves contain the following input field options:
Curve Type
|
Default: Quadratic
|
|
Typical Range: N/A
|
|
Min Max: N/A
|
|
Units: %
|
Curve type associated with the equipment.
Load (Cycle Point)
|
Default: 100
|
|
Typical Range: N/A
|
|
Min Max: 0 to 100
|
|
Units: %
|
Represents the percentage (%) of full load capacity at which the equipment will turn on and off (cycle) to satisfy the load.
Coefficient 1
|
Default: 1
|
|
Typical Range: N/A
|
|
Min Max: N/A
|
|
Units: N/A
|
Default for a quadratic curve type is one.
Coefficient 2
|
Default: 0
|
|
Typical Range: N/A
|
|
Min Max: N/A
|
|
Units: N/A
|
May vary with library member.
Coefficient 3
|
Default: 0
|
|
Typical Range: N/A
|
|
Min Max: N/A
|
|
Units: N/A
|
May vary with library member