Card 9 - HEAT_PIPE Heat Pipe Definition

This optional card defines a heat pipe on a selection of elements or a group name.

Parameters: KODE, N1, T1, T2, T3

KODE

KODE is the code HEAT_PIPE (or 129)

N1

N1 is the HEAT_PIPE card ID. Cards with the same ID reference the same Heat Pipe simulation object.

T1 = NAME

T1 = NAME (or 1) specifies the Heat Pipe entity name in T2.

T1 = SELECTION

T1 = SELECTION (or 2) specifies a selection of elements on which the Heat Pipe entity is applied. The element selection is represented by the group name T2.

T1 = HTC_EVAPORATION

T1 = HTC_EVAPORATION (or 3) specifies an evaporation heat transfer coefficient in T2.

  • If the evaporation heat transfer coefficient is constant, then its value is specified in T2.
  • If the evaporation heat transfer coefficient is table dependent, then T2 is a table multiplier and T3 has the form Tn (e.g. T25) where n is a table number referencing TABTYPE or FIELDTYPE cards.
  • If the evaporation heat transfer coefficient is calculated using an expression, then T2 is an expression multiplier and T3 has the form En (e.g. E25) where n is an expression number referencing the EXPRESSION card.

T1 = HTC_CONDENSATION

T1 = HTC_CONDENSATION (or 4) specifies a condensation heat transfer coefficient in T2.

  • If the condensation heat transfer coefficient is constant, then its value is specified in T2.
  • If the condensation heat transfer coefficient is table dependent, then T2 is a table multiplier and T3 has the form Tn (e.g. T25) where n is a table number referencing TABTYPE or FIELDTYPE cards.
  • If the condensation heat transfer coefficient is calculated using an expression, then T2 is an expression multiplier and T3 has the form En (e.g. E25) where n is an expression number referencing the EXPRESSION card.

T1 = QMAX

T1 = QMAX (or 5) (optional) specifies the maximum heat flux in T2.

  • If the maximum heat flux is constant, then its value is specified in T2.
  • If the maximum heat flux is table dependent, then T2 is a table multiplier and T3 has the form Tn (e.g. T25), where n is a table number referencing TABTYPE or FIELDTYPE cards. The dependent variable on the TABTYPE card is COND.
  • If the heat load is calculated using an expression, then T2 is an expression multiplier and T3 has the form En (e.g. E25) where n is an expression number referencing the EXPRESSION card.

T1 = COND

T1 = COND (or 6) (optional replacement of HTC_EVAPORATION or HTC_CONDENSATION settings) specifies the total conductance in T2.

  • If the total conductance is constant, then its value is specified in T2.
  • If the total conductance is table dependent, then T2 is a table multiplier and T3 has the form Tn (e.g. T25), where n is a table number referencing TABTYPE or FIELDTYPE cards. The dependent variable on the TABTYPE card is QNODE.
  • If the total conductance is calculated using an expression, then T2 is an expression multiplier and T3 has the form En (e.g. E25) where n is an expression number referencing the EXPRESSION card.

T1 = TMIN

T1 = TMIN (or 7) (optional) specifies the minimum temperature in T2. If the heat pipe vapor temperature goes below TMIN, then the heat flow through that heat pipe is turned off.

T1 = TMAX

T1 = TMAX (or 8) (optional) specifies the maximum temperature in T2. If the heat pipe vapor temperature goes above TMAX, then the heat flow through that heat pipe is turned off.

Code example

HEAT_PIPE 300 NAME "Heat Pipe(1)"
HEAT_PIPE 300 SELECTION "Thermal Stream(1)"
HEAT_PIPE 300 HTC_EVAPORATION 1.0E+5
HEAT_PIPE 300 HTC_CONDENSATION 1.0E+5
HEAT_PIPE 300 QMAX 1.0E+5 T5
HEAT_PIPE 300 TMIN -100.0
HEAT_PIPE 300 TMAX 600.0
HEAT_PIPE 300 COND 1.0E+7 T6