REFRIGERATION:COMPRESSORRACK

Works in conjunction with the refrigeration case and walk-in objects to simulate the performance of a refrigerated case system. This object models the electric consumption of the rack compressors and the condenser fans. Heat can be rejected either outdoors or to a zone. Compressor rack waste heat can also be reclaimed for use by an optional air- or water-heating coil (Coil:Heating:Desuperheater and Coil:WaterHeating:Desuperheater).

Name

Type: alphanumeric

Heat Rejection Location

Type: choice (Outdoors or Zone)
Default: Outdoors

Design Compressor Rack COP

Type: real number
It is important that this COP correspond to the lowest saturated suction temperature needed to serve all refrigeration loads
Unit: W/W
Default: 2.0

Compressor Rack COP Function of Temperature Curve Name

Type: list of objects (CURVE:QUADRATIC, CURVE:RECTANGULARHYPERBOLA1, TABLE:LOOKUP, CURVE:RECTANGULARHYPERBOLA2, CURVE:CUBIC, CURVE:FUNCTIONAL:PRESSUREDROP, CURVE:EXPONENT, CURVE:LINEAR, CURVE:QUARTIC, CURVE:EXPONENTIALSKEWNORMAL, CURVE:SIGMOID, CURVE:DOUBLEEXPONENTIALDECAY or CURVE:EXPONENTIALDECAY)
It is important that this COP curve correspond to the lowest saturated suction temperature needed to serve all refrigeration loads

Design Condenser Fan Power

Type: real number
Design power for condenser fan(s).
Unit: W
Minimum: 0.0
Default: 250.0

Condenser Fan Power Function of Temperature Curve Name

Type: list of objects (CURVE:QUADRATIC, CURVE:RECTANGULARHYPERBOLA1, TABLE:LOOKUP, CURVE:RECTANGULARHYPERBOLA2, CURVE:CUBIC, CURVE:FUNCTIONAL:PRESSUREDROP, CURVE:EXPONENT, CURVE:LINEAR, CURVE:QUARTIC, CURVE:EXPONENTIALSKEWNORMAL, CURVE:SIGMOID, CURVE:DOUBLEEXPONENTIALDECAY or CURVE:EXPONENTIALDECAY)

Condenser Type

Type: choice (AirCooled, EvaporativelyCooled or WaterCooled)
Applicable only when Heat Rejection Location is Outdoors.
Default: AirCooled

Water-Cooled Condenser Inlet Node Name

Type: node

Water-Cooled Condenser Outlet Node Name

Type: node

Water-Cooled Loop Flow Type

Type: choice (VariableFlow or ConstantFlow)
Applicable only when Condenser Type is WaterCooled.
Default: VariableFlow

Water-Cooled Condenser Outlet Temperature Schedule Name

Type: list of objects (SCHEDULE:YEAR, SCHEDULE:FILE, SCHEDULE:COMPACT, EXTERNALINTERFACE:FUNCTIONALMOCKUPUNITIMPORT:TO:SCHEDULE, EXTERNALINTERFACE:SCHEDULE or SCHEDULE:CONSTANT)
Applicable only when loop Flow type is VariableFlow.

Water-Cooled Condenser Design Flow Rate

Type: real number
Applicable only when loop flow type is ConstantFlow.
Unit: m3/s

Water-Cooled Condenser Maximum Flow Rate

Type: real number
Unit: m3/s

Water-Cooled Condenser Maximum Water Outlet Temperature

Type: real number
Unit: C
Minimum: 10.0
Maximum: 60.0
Default: 55.0

Water-Cooled Condenser Minimum Water Inlet Temperature

Type: real number
Unit: C
Minimum: 10.0
Maximum: 30.0
Default: 10.0

Evaporative Condenser Availability Schedule Name

Type: list of objects (SCHEDULE:YEAR, SCHEDULE:FILE, SCHEDULE:COMPACT, EXTERNALINTERFACE:FUNCTIONALMOCKUPUNITIMPORT:TO:SCHEDULE, EXTERNALINTERFACE:SCHEDULE or SCHEDULE:CONSTANT)
This field is only used for Condenser Type = EvaporativelyCooled. Schedule values greater than 0 indicate that evaporative cooling of the condenser is available. This schedule allows the user to define seasonal shutdown/draining of the water cooling system in cold climate applications. For periods with schedule values of 0, the condenser operates as AirCooled.

Evaporative Condenser Effectiveness

Type: real number
Applicable only for Condenser Type = EvaporativlyCooled.
Unit: dimensionless
Minimum: 0.0
Maximum: 1.0
Default: 0.9

Evaporative Condenser Air Flow Rate

Type: real number
Applicable only for Condenser Type = EvaporativelyCooled. Used to calculate evaporative condenser water use.
Unit: m3/s
Default: Autocalculate

Basin Heater Capacity

Type: real number
This field is only used for Condenser Type = EvaporativelyCooled and for periods when the evaporatively cooled condenser is available (field Evaporative Condenser Availability Schedule Name). For this situation, the heater heats the basin water when the outdoor air dry-bulb temperature falls below the setpoint temperature, but only when the condenser fans are off (i.e., no refrigerated case load).
Unit: W/K
Minimum: 0.0
Default: 200.0

Basin Heater Setpoint Temperature

Type: real number
Enter the outdoor dry-bulb temperature at which the basin heater turns on.
Unit: C
Minimum: 2.0
Default: 2.0

Design Evaporative Condenser Water Pump Power

Type: real number
Design recirc water pump power for Condenser Type = EvaporativelyCooled. Applicable only for Condenser Type = EvaporativelyCooled.
Unit: W
Minimum: 0.0
Default: 1000.0

Evaporative Water Supply Tank Name

Type: list of objects ( or WATERUSE:STORAGE)
If blank, water supply is from Mains. Applicable only for Condenser Type = EvaporativelyCooled.

Condenser Air Inlet Node Name

Type: node
Applicable only when Heat Rejection Location is Outdoors and Condenser Type is not WaterCooled; otherwise, leave field blank. If field is left blank with Heat Rejection Location = Outdoors, then the model assumes that the Inlet Air conditions are the outdoor air conditions for the current timestep (e.g., no adjustment for height above ground).

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

Refrigeration Case Name or WalkIn Name or CaseAndWalkInList Name

Type: list of objects (REFRIGERATION:WALKIN, REFRIGERATION:AIRCHILLER, REFRIGERATION:CASE or REFRIGERATION:CASEANDWALKINLIST)
Enter the name of a Refrigeration:Case or Refrigeration:Walkin or Refrigeration:CaseAndWalkinList object.

Heat Rejection Zone Name

Type: list of objects ( or ZONE)
This must be a controlled zone and appear in a ZoneHVAC:EquipmentConnections object. Required only if walk-in[s] are connected to this rack AND the heat rejection location is "Zone"