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Documentation: https://maxcode123.github.io/property-utils/
Source code: https://github.com/Maxcode123/property-utils
PyPI: https://pypi.org/project/property-utils/

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property-utils

Utilities for programming that involves physical properties

What is property-utils?

property-utils is a python library that aims at making programming with physical properties easier. It was created to be used by scientists and engineers with little programming experience.

What is provided by property-utils?

Unit arithmetics

You can divide and multiply units to create new units. For example you can create velocity units by dividing length units with time units.

Unit conversions

You can easily convert a property from one unit to another by calling a method.

Property arithmetics

You can add, subtract, divide and multiply properties to create new properties. For example, you can create a density property by dividing a mass property with a volume property.

Installation

pip install property-utils

Quick usage

A simple example:

import math

from property_utils.properties import p
from property_utils.units import (
    BTU,
    FOOT,
    RANKINE,
    HOUR,
    CENTI_METER,
    METER,
    KELVIN,
    KILO_WATT,
)

tube_radius = p(12, CENTI_METER)
tube_length = p(2.3, METER)
heat_exchange_area = 2 * math.pi * tube_length * tube_radius

heat_transfer_coeff = p(150, BTU / RANKINE / FOOT**2 / HOUR)

cold_in = p(273, KELVIN)
cold_out = p(300, KELVIN)
hot_in = p(520, KELVIN)
hot_out = p(472, KELVIN)
diff_in = hot_in - cold_in
diff_out = hot_out - cold_out
temperature_diff = (diff_in - diff_out) / math.log((diff_in / diff_out).value)

print("Heat transfer coefficient =", heat_transfer_coeff)
print("Heat exchange area =", heat_exchange_area)
print("Temperature difference =", temperature_diff)

heat_duty = heat_transfer_coeff * heat_exchange_area * temperature_diff

print("\nHeat duty =", heat_duty)
print("          =", heat_duty.to_si())
print("          =", heat_duty.to_unit(KILO_WATT))

Result:

Heat transfer coefficient = 150 Btu / (ft^2) / hr / °R
Heat exchange area = 1.7341591447815656 (m^2)
Logarithmic mean temperature difference = 207.24308513672648 K

Heat duty = 1044588.4611345044 Btu / hr
          = 306122.45180469507 J / s
          = 306.12245180469506 kW