Card 9 - SINK Elements

KODE

KODE is the code SINK (or 5)

N1

N1 is the sink element number, or a group name. If N1 is a group name, all its elements become sink elements. If N1 is ‘*’, and T1 is FTEMPF, then all the elements specified on file T3 will be sinks with temperature history specified on file T3.

T1

T1 specifies the temperature of the sink element, or the code FTEMPF (or -10000), and the temperatures are read from the file specified in T3.

T2

T2 specifies the time when T1 occurs (this option is not recommended, and if used, T2 may not be < 0), or T2 may be blank or the code CONSTANT, for which T1 is constant. If T2 is ‘*’, its value is ignored.

T3

T3 may be blank or a file name. If T3 is a file name, and T1 is FTEMPF, then the temperatures are read from file T3. File T3 must have file TEMPF format. If T3 is blank, and T1 is FTEMPF, then the temperatures are read from file T3. File T3 must have file TEMPF format.

T4

T4 specifies the layer for multilayer elements. Non-homogeneous multilayer elements are specified on LAYER Cards, homogeneous multilayer elements are specified on PROP Cards.

• T4 = 0, blank, or TOP: The element is not multilayer or temperature is applied to the top layer.
• T4 = MIDDLE: Temperature is applied to the middle layer.
• T4 = BOTTOM: Temperature is applied to the bottom layer.
• T4 = ALL: Temperature is applied to all the layers.
• T4 = SPECIFY: Temperature is applied to the T5’th layer from the bottom. T4 = 1 is the same as T4 = BOTTOM.

T5

T5 is the layer number for T4 = SPECIFY.

Code example

SINK 30 0 CONSTANT 
$ ELEMENT 30 IS DEFINED AS A SINK ELEMENT
$
INTERP 30 0 1 1
$ ELEMENT 30 IS REFERENCED ON TABLE 1
TABTYPE 1 TEMP TIME
$ TABLE 1 DEFINES A TIME-VARYING HISTORY
$
TABDATA 1 20 0 
$ ELEMENT 30 HAS TEMP. OF 20 AT TIME 0
$
TABDATA 1 40 100
$ ELEMENT 30 HAS TEMP. OF 40 AT TIME 100
$
SINK 20 100 CONSTANT
$ ELEMENT 20 HAS A TEMPERATURE 100.0

Notes

A sink element's temperature is a boundary condition for the thermal model, which can be changed in the user-written subroutine or with INTERP Cards.

A sink element temperature should not be adjusted with a follower conductance.

It is recommended that time-dependent sink element temperatures be specified on tables with INTERP, TABTYPE, and TABDATA Cards, and not with the T1 parameter.

A sink element is flagged internally in the Analyzer by a negative capacitance. Thus, a sink element may be changed to a non-sink element with a specified capacitance during a run, by changing its capacitance value. This may be accomplished only in a user-written subroutine.

Sink temperature definitions should not be at absolute zero. This is physically unrealistic, and will cause convergence problems.