MTDATA – Phase Diagram Software from the National Physical Laboratory

 

 

 

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RANGE

Function:

The RANGE command is used to specify temperature, pressure or composition ranges for consideration in subsequent phase boundary searches along with temperature, pressure or composition tolerance values indicating the accuracy to which individual boundaries are to be found. Currently only TEMPERATURE can be RANGEd.

Parameters:

lgt_pressure

pressure

temperature

volume_ideal_gas

system_volume

<”start group”>, <”final group”>, <composition tolerance>

Defaults:

No default temperature, pressure or composition ranges apply.

Examples:

range temperature 1000 2000 0.1 !

range lgt_pressure -10 0 0.01 !

range “start” “end” 0.001 !

Parameter values:

LGT_PRESSURE

takes the values <lower limit>, <upper limit>, <tolerance>

RANGE LGT_PRESSURE will be used to specify, in logarithmic terms, a pressure range to be searched for phase boundaries and an accuracy for the determination of boundary pressures. Currently LGT_PRESSURE cannot be RANGEd within the ASSESSMENT module.

PRESSURE

takes the values <lower limit>, <upper limit>, <tolerance>

RANGE PRESSURE will be used to specify a pressure range to be searched for phase boundaries and an accuracy for the determination of boundary pressures. Currently PRESSURE cannot be RANGEd within the ASSESSMENT module.

TEMPERATURE

takes the values <lower limit>, <upper limit>, <tolerance>

RANGE TEMPERATURE is used to specify a temperature RANGE to be searched for phase boundaries and an accuracy for the determination of boundary temperatures. The TEMPERATURE keyword should be followed by numbers representing, in turn, the lower temperature limit for the search, the upper limit temperature limit for the search and the accuracy required (usually 1.0 or 0.1 K). For example:

range t 1000 2000 0.1 !

Searching is initiated by use of the COMPUTE command once a temperature RANGE has been specified. The calculated temperature of the nth boundary found can then be accessed using LIST PROPERTY TEMPERATURE(n).

VOLUME_IDEAL_GAS

takes the values <lower limit>, <upper limit>, <tolerance>

RANGE VOLUME_IDEAL_GAS will be used to specify a range of gas volumes (modelled ideally) to be searched for phase boundaries and an accuracy for the determination of boundary volumes. Currently VOLUME_IDEAL_GAS cannot be RANGEd within the ASSESSMENT module.

SYSTEM_VOLUME

takes the values <lower limit>, <upper limit>, <tolerance>

RANGE SYSTEM_VOLUME will be used to specify a range of system volumes to be searched for phase boundaries and an accuracy for the determination of boundary volumes. Currently SYSTEM_VOLUME cannot be RANGEd within the ASSESSMENT module.

<”start group”>, <”final group”>, <composition tolerance>

Composition ranges for phase boundary searches will be specified in terms of named start and end composition groups. Currently composition cannot be RANGEd within the ASSESSMENT module.

 
General comments:

None.

 

Updated 9 June 2011