ChemCAD 5 services to visual basic applications: User Manual, страница 14

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Methods          It takes two methods calls to complete a unit conversion for stream data. The first method defines a set of stream data and the following method call returns the converted stream data to the caller.

To convert stream data in current user units, user first call

Method             DefineStreamInCurUserUnit

Returns                        number of data items received from array compFlow

Note that the argument flowOption identifies the meaning of argument flow. It may be one the four choices 1 – mole rate; 2 – mass rate; 3 – standard liquid volume rate; 4 – standard vapor volume rate. After defining a set of stream data, user calls

                        Method             GetStreamInInternalUnit

Returns            numbre of data items returned in array compFlowLbmol_Hr

The next pair of methods is for conversion of stream data in internal units to current user units.

Method             DefineStreamInInternalUnit

Returns                        number of data items received from array compFlowLbmol_Hr

Method             GetStreamInCurUserUnit

Returns                        number of data items returned in array compFlow

When tabulating the stream data, one more method can be called to get the engineering unit strings of the current user units.

Method             GetCurUserUnitString

The argument compCate gives the representation of component data in the current user units, i.e., either Flowrates or Components. In the case of Flowrates, the units are given by compUnit. If it is Components, the definition of the compositions is given by compUnit. For example, the compCate returns Components, compUnit returns mole fractions indicating the component data in current user units are in mole fractions.

Description      IUnitOpSpecUnitConversion interface exposes methods for engineering unit conversions of the unit specification parameters. The unit specifications are organized as a one-dimensional array of float type. User should prepare this array along with the second array for receiving converted data before calling the methods of this interface.