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Type | Intent | Optional | Attributes | Name | ||
---|---|---|---|---|---|---|
integer, | intent(in) | :: | VRFTUNum | |||
logical, | intent(in) | :: | FirstHVACIteration | |||
real(kind=r64), | intent(in) | :: | PartLoadRatio | |||
real(kind=r64), | intent(out) | :: | LoadMet | |||
real(kind=r64), | intent(inout) | :: | OnOffAirFlowRatio | |||
real(kind=r64), | intent(inout), | optional | :: | LatOutputProvided |
Nodes of different colours represent the following:
Solid arrows point from a procedure to one which it calls. Dashed arrows point from an interface to procedures which implement that interface. This could include the module procedures in a generic interface or the implementation in a submodule of an interface in a parent module. Where possible, edges connecting nodes are given different colours to make them easier to distinguish in large graphs.
Nodes of different colours represent the following:
Solid arrows point from a procedure to one which it calls. Dashed arrows point from an interface to procedures which implement that interface. This could include the module procedures in a generic interface or the implementation in a submodule of an interface in a parent module. Where possible, edges connecting nodes are given different colours to make them easier to distinguish in large graphs.
SUBROUTINE CalcVRF(VRFTUNum, FirstHVACIteration, PartLoadRatio, LoadMet, OnOffAirFlowRatio, LatOutputProvided)
! SUBROUTINE INFORMATION:
! AUTHOR Richard Raustad
! DATE WRITTEN July 2005
! MODIFIED July 2012, Chandan Sharma - FSEC: Added zone sys avail managers
! RE-ENGINEERED na
! PURPOSE OF THIS SUBROUTINE:
! Simulate the components making up the VRF terminal unit.
! METHODOLOGY EMPLOYED:
! Simulates the unit components sequentially in the air flow direction.
! REFERENCES:
! na
! USE STATEMENTS:
USE Fans, ONLY: SimulateFanComponents
USE DXCoils, ONLY: SimDXCoil
USE MixedAir, ONLY: SimOAMixer
USE HeatingCoils, ONLY: SimulateHeatingCoilComponents
USE SteamCoils, ONLY: SimulateSteamCoilComponents
USE WaterCoils, ONLY: SimulateWaterCoilComponents
USE InputProcessor, ONLY: SameString
USE HVACHXAssistedCoolingCoil, ONLY: SimHXAssistedCoolingCoil
USE DataEnvironment, ONLY: OutDryBulbTemp
USE DataSizing, ONLY: Autosize
! USE WatertoAirheatPumpSimple, ONLY: SimWatertoAirHPSimple
USE DataAirLoop, ONLY: LoopDXCoilRTF
IMPLICIT NONE ! Enforce explicit typing of all variables in this routine
! SUBROUTINE ARGUMENT DEFINITIONS:
INTEGER, INTENT (IN) :: VRFTUNum ! Unit index in VRF terminal unit array
LOGICAL, INTENT (IN) :: FirstHVACIteration ! flag for 1st HVAC iteration in the time step
REAL(r64), INTENT (IN) :: PartLoadRatio ! compressor part load fraction
REAL(r64), INTENT (OUT) :: LoadMet ! load met by unit (W)
REAL(r64), INTENT (INOUT) :: OnOffAirFlowRatio ! ratio of ON air flow to average air flow
REAL(r64), OPTIONAL, INTENT (INOUT) :: LatOutputProvided ! delivered latent capacity (W)
! SUBROUTINE PARAMETER DEFINITIONS:
INTEGER, PARAMETER :: MaxIte = 500 ! maximum number of iterations
CHARACTER(len=*), PARAMETER :: Blank = ' ' ! subroutine argument when coil index is known
! INTERFACE BLOCK SPECIFICATIONS
! na
! DERIVED TYPE DEFINITIONS
! na
! SUBROUTINE LOCAL VARIABLE DECLARATIONS:
INTEGER :: VRFTUOutletNodeNum ! TU air outlet node
INTEGER :: VRFTUInletNodeNum ! TU air inlet node
REAL(r64):: AirMassFlow ! total supply air mass flow [m3/s]
REAL(r64):: MinHumRat ! minimum humidity ratio for sensible capacity calculation (kg/kg)
INTEGER :: OpMode ! fan operating mode, CycFanCycCoil or ContFanCycCoil
INTEGER :: VRFCond ! index to VRF condenser
REAL(r64):: SpecHumOut ! specific humidity ratio at outlet node
REAL(r64):: SpecHumIn ! specific humidity ratio at inlet node
INTEGER :: TUListIndex ! index to TU list for this VRF system
INTEGER :: IndexToTUInTUList ! index to TU in specific list for the VRF system
! FLOW
VRFCond = VRFTU(VRFTUNum)%VRFSysNum
TUListIndex = VRF(VRFCond)%ZoneTUListPtr
IndexToTUInTUList = VRFTU(VRFTUNum)%IndexToTUInTUList
VRFTUOutletNodeNum = VRFTU(VRFTUNum)%VRFTUOutletNodeNum
VRFTUInletNodeNum = VRFTU(VRFTUNum)%VRFTUInletNodeNum
OpMode = VRFTU(VRFTUNum)%OpMode
! Set inlet air mass flow rate based on PLR and compressor on/off air flow rates
CALL SetAverageAirFlow(VRFTUNum, PartLoadRatio, OnOffAirFlowRatio)
AirMassFlow = Node(VRFTUInletNodeNum)%MassFlowRate
IF(VRFTU(VRFTUNum)%OAMixerUsed)CALL SimOAMixer(VRFTU(VRFTUNum)%OAMixerName,FirstHVACIteration,VRFTU(VRFTUNum)%OAMixerIndex)
! if blow through, simulate fan then coils
IF (VRFTU(VRFTUNum)%FanPlace .EQ. BlowThru) THEN
CALL SimulateFanComponents(' ',FirstHVACIteration,VRFTU(VRFTUNum)%FanIndex,FanSpeedRatio, &
ZoneCompTurnFansOn, ZoneCompTurnFansOff)
END IF
IF(VRFTU(VRFTUNum)%CoolingCoilPresent)THEN
IF ((.NOT. VRF(VRFCond)%HeatRecoveryUsed .AND. CoolingLoad(VRFCond)) .OR. &
! above condition for heat pump mode, below condition for heat recovery mode
(VRF(VRFCond)%HeatRecoveryUsed .AND. TerminalUnitList(TUListIndex)%HRCoolRequest(IndexToTUInTUList)))THEN
CALL SimDXCoil(' ',On,FirstHVACIteration,PartLoadRatio,VRFTU(VRFTUNum)%CoolCoilIndex, &
OpMode,OnOffAirFlowRatio, MaxCap=MaxCoolingCapacity(VRFCond), &
CompCyclingRatio = VRF(VRFTU(VRFTUNum)%VRFSysNum)%VRFCondCyclingRatio)
ELSE ! cooling coil is off
CALL SimDXCoil(' ',Off,FirstHVACIteration,0.0d0, &
VRFTU(VRFTUNum)%CoolCoilIndex,OpMode,OnOffAirFlowRatio)
END IF
LoopDXCoolCoilRTF = LoopDXCoilRTF
ELSE
LoopDXCoolCoilRTF = 0.d0
END IF
IF(VRFTU(VRFTUNum)%HeatingCoilPresent)THEN
IF ((.NOT. VRF(VRFCond)%HeatRecoveryUsed .AND. HeatingLoad(VRFCond)) .OR. &
! above condition for heat pump mode, below condition for heat recovery mode
(VRF(VRFCond)%HeatRecoveryUsed .AND. TerminalUnitList(TUListIndex)%HRHeatRequest(IndexToTUInTUList)))THEN
CALL SimDXCoil(' ',Off,FirstHVACIteration,PartLoadRatio, &
VRFTU(VRFTUNum)%HeatCoilIndex,OpMode,OnOffAirFlowRatio, &
MaxCap=MaxHeatingCapacity(VRFCond))
ELSE
CALL SimDXCoil(' ',Off,FirstHVACIteration,0.0d0, &
VRFTU(VRFTUNum)%HeatCoilIndex,OpMode,OnOffAirFlowRatio)
END IF
LoopDXHeatCoilRTF = LoopDXCoilRTF
ELSE
LoopDXHeatCoilRTF = 0.d0
END IF
! if draw through, simulate coils then fan
IF (VRFTU(VRFTUNum)%FanPlace .EQ. DrawThru) THEN
CALL SimulateFanComponents(' ',FirstHVACIteration,VRFTU(VRFTUNum)%FanIndex,FanSpeedRatio, &
ZoneCompTurnFansOn, ZoneCompTurnFansOff)
END IF
! track fan power per terminal unit for calculating COP
VRFTU(VRFTUNum)%FanPower = FanElecPower
! calculate sensible load met using delta enthalpy at a constant (minimum) humidity ratio
MinHumRat = MIN(Node(VRFTUInletNodeNum)%HumRat,Node(VRFTUOutletNodeNum)%HumRat)
LoadMet = AirMassFlow * (PsyHFnTdbW(Node(VRFTUOutletNodeNum)%Temp,MinHumRat) - &
PsyHFnTdbW(Node(VRFTUInletNodeNum)%Temp,MinHumRat))
IF(PRESENT(LatOutputProvided))THEN
! CR9155 Remove specific humidity calculations
SpecHumOut = Node(VRFTUOutletNodeNum)%HumRat
SpecHumIn = Node(VRFTUInletNodeNum)%HumRat
LatOutputProvided = AirMassFlow * (SpecHumOut - SpecHumIn) ! Latent rate, kg/s (dehumid = negative)
END IF
RETURN
END SUBROUTINE CalcVRF