WATERHEATER:STRATIFIED

Water heater with stratified, multi-node water tank. May be used to model a tankless water heater (small tank volume), a hot water storage tank (zero heater capacity), or a heat pump water heater (see WaterHeater:HeatPump:*.)

Name

Type: alphanumeric

End-Use Subcategory

Type: alphanumeric
Any text may be used here to categorize the end-uses in the ABUPS End Uses by Subcategory table.
Default: General

Tank Volume

Type: real number
Unit: m3

Tank Height

Type: real number
Height is measured in the axial direction for horizontal cylinders
Unit: m

Tank Shape

Type: choice (VerticalCylinder, HorizontalCylinder or Other)
Default: VerticalCylinder

Tank Perimeter

Type: real number
Only used if Tank Shape is Other
Unit: m
Minimum: 0.0

Maximum Temperature Limit

Type: real number
Unit: C

Heater Priority Control

Type: choice (MasterSlave or Simultaneous)
Default: MasterSlave

Heater 1 Setpoint Temperature Schedule Name

Type: list of objects (SCHEDULE:COMPACT, SCHEDULE:FILE, SCHEDULE:YEAR, SCHEDULE:CONSTANT, EXTERNALINTERFACE:SCHEDULE or EXTERNALINTERFACE:FUNCTIONALMOCKUPUNITIMPORT:TO:SCHEDULE)

Heater 1 Deadband Temperature Difference

Type: real number
Unit: deltaC
Minimum: 0.0
Default: 0.0

Heater 1 Capacity

Type: real number
Unit: W
Minimum: 0.0

Heater 1 Height

Type: real number
Unit: m
Minimum: 0.0

Heater 2 Setpoint Temperature Schedule Name

Type: list of objects (SCHEDULE:COMPACT, SCHEDULE:FILE, SCHEDULE:YEAR, SCHEDULE:CONSTANT, EXTERNALINTERFACE:SCHEDULE or EXTERNALINTERFACE:FUNCTIONALMOCKUPUNITIMPORT:TO:SCHEDULE)

Heater 2 Deadband Temperature Difference

Type: real number
Unit: deltaC
Minimum: 0.0
Default: 0.0

Heater 2 Capacity

Type: real number
Unit: W
Minimum: 0.0

Heater 2 Height

Type: real number
Unit: m
Minimum: 0.0

Heater Fuel Type

Type: choice (Electricity, NaturalGas, Propane, FuelOilNo1, FuelOilNo2, Coal, Diesel, Gasoline, OtherFuel1, OtherFuel2, Steam or DistrictHeating)

Heater Thermal Efficiency

Type: real number
Maximum: 1.0

Off Cycle Parasitic Fuel Consumption Rate

Type: real number
Unit: W
Minimum: 0.0
Default: 0.0

Off Cycle Parasitic Fuel Type

Type: choice (Electricity, NaturalGas, Propane, FuelOilNo1, FuelOilNo2, Coal, Diesel, Gasoline, OtherFuel1, OtherFuel2, Steam or DistrictHeating)

Off Cycle Parasitic Heat Fraction to Tank

Type: real number
Minimum: 0.0
Maximum: 1.0
Default: 0.0

Off Cycle Parasitic Height

Type: real number
Unit: m
Minimum: 0.0
Default: 0.0

On Cycle Parasitic Fuel Consumption Rate

Type: real number
Unit: W
Minimum: 0.0
Default: 0.0

On Cycle Parasitic Fuel Type

Type: choice (Electricity, NaturalGas, Propane, FuelOilNo1, FuelOilNo2, Coal, Diesel, Gasoline, OtherFuel1, OtherFuel2, Steam or DistrictHeating)

On Cycle Parasitic Heat Fraction to Tank

Type: real number
Minimum: 0.0
Maximum: 1.0
Default: 0.0

On Cycle Parasitic Height

Type: real number
Unit: m
Minimum: 0.0
Default: 0.0

Ambient Temperature Indicator

Type: choice (Schedule, Zone or Outdoors)

Ambient Temperature Schedule Name

Type: list of objects (SCHEDULE:COMPACT, SCHEDULE:FILE, SCHEDULE:YEAR, SCHEDULE:CONSTANT, EXTERNALINTERFACE:SCHEDULE or EXTERNALINTERFACE:FUNCTIONALMOCKUPUNITIMPORT:TO:SCHEDULE)

Ambient Temperature Zone Name

Type: list of objects ( or ZONE)

Ambient Temperature Outdoor Air Node Name

Type: node
Required for Ambient Temperature Indicator=Outdoors

Uniform Skin Loss Coefficient per Unit Area to Ambient Temperature

Type: real number
Unit: W/m2-K
Minimum: 0.0

Skin Loss Fraction to Zone

Type: real number
Minimum: 0.0
Maximum: 1.0
Default: 1.0

Off Cycle Flue Loss Coefficient to Ambient Temperature

Type: real number
Unit: W/K
Minimum: 0.0

Off Cycle Flue Loss Fraction to Zone

Type: real number
Minimum: 0.0
Maximum: 1.0
Default: 1.0

Peak Use Flow Rate

Type: real number
Only used if Use Side Node connections are blank
Unit: m3/s
Minimum: 0.0

Use Flow Rate Fraction Schedule Name

Type: list of objects (SCHEDULE:COMPACT, SCHEDULE:FILE, SCHEDULE:YEAR, SCHEDULE:CONSTANT, EXTERNALINTERFACE:SCHEDULE or EXTERNALINTERFACE:FUNCTIONALMOCKUPUNITIMPORT:TO:SCHEDULE)
If blank, defaults to 1.0 at all times Only used if use side node connections are blank

Cold Water Supply Temperature Schedule Name

Type: list of objects (SCHEDULE:COMPACT, SCHEDULE:FILE, SCHEDULE:YEAR, SCHEDULE:CONSTANT, EXTERNALINTERFACE:SCHEDULE or EXTERNALINTERFACE:FUNCTIONALMOCKUPUNITIMPORT:TO:SCHEDULE)
Only used if use side node connections are blank Defaults to water temperatures calculated by Site:WaterMainsTemperature object

Use Side Inlet Node Name

Type: node

Use Side Outlet Node Name

Type: node

Use Side Effectiveness

Type: real number
The use side effectiveness in the stratified tank model is a simplified analogy of a heat exchanger's effectiveness. This effectiveness is equal to the fraction of use mass flow rate that directly mixes with the tank fluid. And one minus the effectiveness is the fraction that bypasses the tank. The use side mass flow rate that bypasses the tank is mixed with the fluid or water leaving the stratified tank.
Minimum: 0.0
Maximum: 1.0
Default: 1.0

Use Side Inlet Height

Type: real number
Defaults to bottom of tank
Unit: m
Minimum: 0.0
Default: 0.0

Use Side Outlet Height

Type: real number
Defaults to top of tank
Unit: m
Minimum: 0.0
Default: Autocalculate

Source Side Inlet Node Name

Type: node

Source Side Outlet Node Name

Type: node

Source Side Effectiveness

Type: real number
The source side effectiveness in the stratified tank model is a simplified analogy of a heat exchanger's effectiveness. This effectiveness is equal to the fraction of source mass flow rate that directly mixes with the tank fluid. And one minus the effectiveness is the fraction that bypasses the tank. The source side mass flow rate that bypasses the tank is mixed with the fluid or water leaving the stratified tank.
Maximum: 1.0
Default: 1.0

Source Side Inlet Height

Type: real number
Defaults to top of tank
Unit: m
Minimum: 0.0
Default: Autocalculate

Source Side Outlet Height

Type: real number
Defaults to bottom of tank
Unit: m
Minimum: 0.0
Default: 0.0

Inlet Mode

Type: choice (Fixed or Seeking)
Default: Fixed

Use Side Design Flow Rate

Type: real number
Unit: m3/s
Minimum: 0.0
Default: autosize

Source Side Design Flow Rate

Type: real number
Unit: m3/s
Minimum: 0.0
Default: autosize

Indirect Water Heating Recovery Time

Type: real number
Parameter for autosizing design flow rates for indirectly heated water tanks time required to raise temperature of entire tank from 14.4C to 57.2C
Unit: hr
Default: 1.5

Number of Nodes

Type: integer
Minimum: 1
Maximum: 12
Default: 1