Energy Recovery Ventilators
This compound component models a standalone energy recovery ventilator (ERV) that conditions outdoor ventilation air and supplies that air directly to a zone. The ERV unit is modeled as a collection of components: air-to-air heat exchanger, supply air fan, exhaust air fan and an optional controller to avoid overheating of the supply air (economizer or free cooling operation).
Note: Standard TRACE library members cannot be modified or deleted but they can be copied and edited.
Use Zone Ventilation
By defult the calculated supply and exhaust air flow rates will determine the ERV flow rate. Turning this setting to "No" will allow for manual settings below.
People Based Rate
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Default: 0 cfm/person
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Typical Range: 0 to 20 cfm/person
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Min Max: 0 to 1,000,000,000,000,000 (this field cannot be left blank)
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Units: cfm/person; (m3/s)/person; (L/s)/person; (m3/hr)/person
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This optional numeric field defines the ventilation rate per occupant in cubic meters per second per occupant. This field is only used when the supply and exhaust air flow rates are auto-sized.
Area Based Rate
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Default: 0 cfm/ft2
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Typical Range: 0 to 0.3
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Min Max: 0 to 1,000,000,000,000,000 (this field cannot be left blank)
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Units: cfm/ft2; (m3/s)/m2; (m3/hr)/per m2
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This optional numeric field defines the ventilation rate per unit floor area in cubic meters per second per square meter. This field is only used when the supply and exhaust air flow rates are auto-sized.
Supply Fan
Supply Fan Type
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Default: Constant Volume
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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 is the type of supply fan that is associated with the library member. Two options are available: Constant or Variable Volume.
Supply Air Fan
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Default: Constant Volume Fan
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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 input selection refers to the name of the fan library member that is used in this object.
Pressure Rise
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Default: 4 inches H2O
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Typical Range: 0.25 to 5 inches H2O
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Min Max: 0 to 1,000,000,000,000,000 (this field cannot be left blank)
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Units: inches H2O; lb/ft2; psig; Pa; kPa; mm Hg; mm H2O; bar; in Hg; atm; mm CE; m CE; m H2O; mbar
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The value will be populated by default based on the fan library member selected. You can override this value and the units of measure.
Fan Full Load Energy Rate
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Default: 0.0002 kW/(cfm) ; Auto Size box is unchecked
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Typical Range: 0.0001 to 0.0004 kW/(cfm)
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Min Max: 0 to 1,000,000,000,000,000 (this field cannot be left blank)
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Units: W; kW; W/(m3/sec); W/(m3/sec)-Pa; W/(cfm); W/(L/sec); W/(L/sec)-in H2O; kW/(cfm); kW/(L/sec); kW/(cfm)-in H2O; kW/(L/sec)-in H2O; W/(cfm)-in H2O; bhp
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This checkbox indicates whether or not the full load energy rate used for the selected fan will be auto sized by the program or defined by the user.
Exhaust Fan
Exhaust Fan Type
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Default: Constant Volume
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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 is the type of exhaust fan that is associated with the library member. Two options are available: Constant or Variable Volume.
Exhaust Air Fan
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Default: Direct Drive Plenum Fan
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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 input selection refers to the name of the fan library member that is used for this object.
Pressure Rise
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Default: 4 inches H2O
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Typical Range: 0.25 to 5 inches H2O
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Min Max: 0 to 1,000,000,000,000,000 (this field cannot be left blank)
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Units: inches H2O; lb/ft2; psig; Pa; kPa; mm Hg; mm H2O; bar; in Hg; atm; mm CE; m CE; m H2O; mbar
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The value will be populated by default based on the fan library member selected. You can override this value and the units of measure.
Fan Full Load Energy Rate
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Default: 0.0002 kW/(cfm) ; Auto Size box is unchecked
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Typical Range: 0.0001 to 0.0004 kW/(cfm)
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Min Max: 0 to 1,000,000,000,000,000 (this field cannot be left blank)
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Units: W; kW; W/(m3/sec); W/(m3/sec)-Pa; W/(cfm); W/(L/sec); W/(L/sec)-in H2O; kW/(cfm); kW/(L/sec); kW/(cfm)-in H2O; kW/(L/sec)-in H2O; W/(cfm)-in H2O; bhp
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This checkbox indicates whether or not the full load energy rate used for the selected fan will be auto sized by the program or defined by the user.
Heat Exchanger
Heat Exchanger Type
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Default: Sensible and Latent
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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 input selection refers to the heat exchanger type used for this object. The only allowable type is Sensible and Latent.
Heat Exchanger
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Default: Fixed-membrane Heat Exchanger
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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 input selection refers to the heat exchanger library member that is used for this object.
Economizer Control
Enable Economizer Mode
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Default: None
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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 input selection refers to the type of operational controller that is used by this object. The following list of controller types are available to select: Fixed Dry Bulb, Fixed Enthalpy, Differential Dry Bulb, Differential Enthalpy, Fixed Dew Point and Dry Bulb, Differential Dry Bulb and Enthalpy.
Humidity Control
Enable Humidity Control
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Default: No
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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 input selection refers to whether or not humidity control is used by this object when in operation. Allowable options are Yes or No.