NTU_FROM_UA

This function converts overall conductance and minimum heat-capacity rate into exchanger transfer units. It is a core relation used in effectiveness-NTU calculations.

The formula is \mathrm{NTU}=\frac{UA}{C_{min}}.

Excel Usage

=NTU_FROM_UA(UA, Cmin)

• UA (float, required): Area heat transfer coefficient product (W/K).
• Cmin (float, required): Minimum heat capacity rate (W/K).

Returns (float): Thermal number of transfer units (-).

Example 1: NTU from UA example

Inputs:

UA	Cmin
4400	22

Excel formula:

=NTU_FROM_UA(4400, 22)

Expected output:

200

Example 2: NTU for smaller UA

Inputs:

UA	Cmin
1200	30

Excel formula:

=NTU_FROM_UA(1200, 30)

Expected output:

40

Example 3: NTU for larger UA

Inputs:

UA	Cmin
10000	50

Excel formula:

=NTU_FROM_UA(10000, 50)

Expected output:

200

Example 4: NTU for high capacity rate

Inputs:

UA	Cmin
5000	200

Excel formula:

=NTU_FROM_UA(5000, 200)

Expected output:

25

Python Code

Show Code

from ht.hx import NTU_from_UA as hx_NTU_from_UA

def NTU_from_UA(UA, Cmin):
    """
    Calculate NTU from UA and the minimum heat capacity rate.

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

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

    Args:
        UA (float): Area heat transfer coefficient product (W/K).
        Cmin (float): Minimum heat capacity rate (W/K).

    Returns:
        float: Thermal number of transfer units (-).
    """
    try:
        result = hx_NTU_from_UA(UA=UA, Cmin=Cmin)
        return result
    except Exception as e:
        return f"Error: {str(e)}"

Online Calculator

UA *

Area heat transfer coefficient product (W/K).

Cmin *

Minimum heat capacity rate (W/K).