IS_HEATING_TEMP

This function determines the direction of heat transfer between a wall and a flowing fluid using bulk and wall temperatures. It returns whether the wall causes net heating of the bulk stream.

The criterion is based on the temperature difference:

\Delta T = T_{wall} - T

When \Delta T > 0, heat flows from wall to fluid and the function returns True; otherwise it returns False.

Excel Usage

=IS_HEATING_TEMP(T, T_wall)

T (float, required): Temperature of the flowing fluid away from the wall (K).
T_wall (float, required): Temperature of the wall (K).

Returns (bool): True when the bulk fluid is being heated.

Example 1: Wall hotter than bulk fluid

Inputs:

T	T_wall
298.15	350

Excel formula:

=IS_HEATING_TEMP(298.15, 350)

Expected output:

true

Example 2: Wall cooler than bulk fluid

Inputs:

T	T_wall
350	300

Excel formula:

=IS_HEATING_TEMP(350, 300)

Expected output:

false

Example 3: Equal wall and bulk temperatures

Inputs:

T	T_wall
320	320

Excel formula:

=IS_HEATING_TEMP(320, 320)

Expected output:

false

Example 4: Slight temperature rise at the wall

Inputs:

T	T_wall
310	315

Excel formula:

=IS_HEATING_TEMP(310, 315)

Expected output:

true

Python Code

Show Code

from ht.core import is_heating_temperature as ht_is_heating_temperature

def is_heating_temp(T, T_wall):
    """
    Determine whether a wall heats or cools a flow from temperatures.

    See: https://ht.readthedocs.io/en/latest/ht.core.html

    This example function is provided as-is without any representation of accuracy.

    Args:
        T (float): Temperature of the flowing fluid away from the wall (K).
        T_wall (float): Temperature of the wall (K).

    Returns:
        bool: True when the bulk fluid is being heated.
    """
    try:
        return ht_is_heating_temperature(T, T_wall)
    except Exception as e:
        return f"Error: {str(e)}"

Online Calculator

T *

Temperature of the flowing fluid away from the wall (K).

T_wall *

Temperature of the wall (K).