Evaporation Operation Variables

● Evaporation operation specific variables are listed in the following table:

Variable	Variable ID (varID)	Data Type	Extra arg. (val2) and type	I/O
Forward or Backward feed	bForwardFeed_VID	Boolean		I/O
Vapor Recompression option	vaporRecompressionOption_VID	Long¹		I/O
Evaporation Option	evaporationOption_VID	Long²		I/O
Neglect heat of Dilution/Boiling Point Elevation	bNeglectHeatOfDilution_VID	Boolean		I/O
MTD per effect set by user	bMTDSetByUser_VID	Boolean		I/O
Do we ignore Component for sizing calculations?	bSteamCalcSetForVapor_VID	Boolean		I/O
Vapor enthalpy set by user	bVaporEnthalpySetByUser_VID	Boolean		I/O
Is latent heat of condensation of vapor in each subsequent effect calculated	bVaporDHInNextEffectSetbyUser_VID	Boolean		I/O
Heating fluid has same properties as vapor	bMixSameAsVapor_VID	Boolean		I/O
Recycle vapor fraction is set by user in MVR	bRecycledVaporFracSetByUser_VID	Boolean		I/O
Specific heat ratio of recycle vapor in the compressor is set by user	bRecycledVaporSpecHeatRatioSet_VID	Boolean		I/O
Cooling agent is used in MVR for desuperheating	bUseCoolingAgent_VID	Boolean		I/O
Additional power calculation mode	additionalPowerCalcMode_VID	Long³		I/O
Key Component	keyComp_VID	String		I/O
Key component final concentration	keyCompFinalConc_VID	double		I/O
Key component final massfraction	keyCompFinalMassFrac_VID	double		I/O
Evaporator capacity	capacity_VID	douhle		O
Evaporator economy	economy_VID	double		O
Heat Transfer Agent Name	hxAgentName_VID	String		O
Heat Transfer Agent Rate	hxAgentRate_VID	double		O
Heat Transfer Agent Duty	hxAgentDuty_VID	double		O
Mass flow rate of agent- vapor mixture if first effect	mixMassFlow_VID	double		O
Outlet temperature of mixture	mixOutTemp_VID	double		O
Condensatio of agent in first effect	Tc_VID	double		I/O
Correction of specific enthalpy of feed stream	feedEnthalpyCorrection_VID	double		I/O
Specific enthalpy of the feed stream	feedSolutionEnthalpy_VID	double		I/O
Boiling point of product in last effect	Tb_VID	double		I/O
Number of Effects	nEffects_VID	Long		I/O
Power Name	powerName_VID	String		O
Power per unit	powerPerUnit_VID	double		I/O
Specific enthalpy of the heating fluid at the steam chest inlet of the first effect	mixSpecificInletEnthalpy_VID	double		O
Specific enthalpy of the heating fluid at the steam chest outlet of the first effect	mixSpecificOutletEnthalpy_VID	double		I/O
Pressure of agent/vapor mixture in first effect	mixPress_VID	double		I/O
Recycled vapor fraction	recycledVaporFrac_VID	double		I/O
Recycled vapor flow	recycledVaporFlow_VID	double		O
Specific heat ratio of recycled vapor	recycledVaporSpecificHeatRatio_VID	double		I/O
Isentropic compression efficiency	compressionEff_VID	double		I/O
Enthalpy change of vapor in the compressor	vaporDHInCompressor_VID	double		O
Cooling agent name used for desuperheating	coolingAgentName_VID	String		O
Mass flowrate of cooling agent	coolingAgentFlow_VID	double		O
Cooling agent duty	coolingAgentDuty_VID	double		O
additional mechanical compression efficiency losses	otherCompressorEffLosses_VID	double		I/O
Compressor Power	compressorPower_VID	double		O
Equivalent capacity of MVR	equivalentAgentFlow_VID	double		O
Additional power	additionalPower_VID	double		I/O
Additional power per unit	additionalPowerPerUnit_VID	double		I/O
Additional specific power	additionalSpecificPower_VID	double		I/O
Ratio of entrained vapor flow to heat transfer agent flow in the steam ejector	entrainmentRatio_VID	double		I/O
Effect from which vapor is drawn in TVR	recycleEffectNoInTVR_VID	double		I/O
Secondary Heat Transfer Agent Name	secondaryHxAgentName_VID	String		O
Secondary Heat Transfer Agent Rate	secondaryHxAgentRate_VID	Double		O
Secondary Heat Transfer Agent Duty	secondaryHxAgentDuty_VID	Double		O
Is Secondary Heat Transfer Agent Heating or Cooling?	isSecondaryHxAgentHeating_VID	Boolean		O
Is component volatile	bVolatile_VID	Boolean	Component Name (String)	I/O
Relative evaporation of each component	relativeEvaporation_VID	double	Component Name (String)	I/O
Evaporation fraction of each component	evaporationFraction_VID	double	Component Name (String)	I/O
Specific heat duty per effect	specificHeatDuty_VID	double	Effect Number (integer)	I/O
Heat transfer coefficient per effect	heatTransferCoefficient_VID	double	Effect Number (integer)	I/O
Heat exchanger area per effect	area_VID	double	Effect Number (integer)	O
Mean temperature difference between agent and solution per effect	MTD_VID	double	Effect Number (integer)	O
Liquor boiling point temperature per effect	liquorBP_VID	double	Effect Number (integer)	O
Boiling point elevation per effect	BPE_VID	double	Effect Number (integer)	O
Vapor boiling point per effect	vaporBP_VID	double	Effect Number (integer)	O
Vapor pressure per effect	vaporPress_VID	double	Effect Number (integer)	O
Specific enthalpy of liquor stream per effect	relativeLiquorEnthalpy_VID	double	Effect Number (integer)	I/O
Specific enthalpy of vaporstream per effect	relativeVaporEnthalpy_VID	double	Effect Number (integer)	I/O
Liquor enthalpy of liquid stream per effect	liquorEnthalpy_VID	double	Effect Number (integer)	I/O
Specific enthalpyof vapor stream per effect	vaporEnthalpy_VID	doihle	Effect Number (integer)	I/O
Vapor flow per effect	vaporFlow_VID	double	Effect Number (integer)	O
Power	power_VID	double		I/O
Specific power	specPower_VID	double		I/O

●

Long¹: Note that you can use the following correspondence between the number and the vapor recompression option:

Flowrate Option	Long
None	0
Thermal recompression (THR)	1
Mechanical vapor recompression (MVR)	2

Long²: Note that you can use the following correspondence between the number and the evaporation option:

Flowrate Option	Long
Key component final concentration	1
Key component final mass fraction	2
Evaporation fraction	3

Long³: Note that you can use the following correspondence between the number and the power calculation mode:

Flowrate Option	Long
Set By User	1
From Specific Power	2
From Power Per Unit	5