Sandlermisc

Miscellaneous utilities from Sandler's 5th ed.

Sandlermisc implements a python interface to a few miscellaneous utilities from Chemical, Biochemical, and Engineering Thermodynamics (5th edition) by Stan Sandler (Wiley, USA). It should be used for educational purposes only.

Current utilities:

1. ThermodynamicState: An abstract class for handling thermodynamic states for pure components
2. ureg: a pint unit registry
3. R: the universal gas constant as a pint Quantity
4. DeltaH_IG and DeltaS_IG: Ideal-gas delta-h and delta-s calculations

Installation

Sandlermisc is available via pip:

pip install sandlermisc

Usage

API

ThermodynamicState is an abstract class that manages state-variable attributes:

• T -- temperature
• P -- pressure
• v -- molar volume or specific volume
• h -- molar ethalpy or specific enthapy
• u -- molar internal energy or specific internal energy
• s -- molar entropy or specific entropy
• x -- vapor fraction for a saturated state

A subclass of ThermodynamicState must define the method resolve() to compute state variables from input state variables. Any instance of such a subclass will automatically compute all state variables once enough inputs are specified.

DeltaH_IG requires the temperature of state 1 (assumed in K if units not specified), the temperature of state 2, and an ideal-gas heat-capacity argument, which can be a scalar, four-element list of floats, or four-element dict with keys a, b, c, and d.

>>> from sandlermisc import DeltaH_IG
>>> DeltaH_IG(100, 200, 10)
<Quantity(1000.0, 'joule / mole')>
>>> DeltaH_IG(500, 600, [10., 0.01, 0.00002, 0.000000032]) 
<Quantity(2693.46667, 'joule / mole')>
>>> DeltaH_IG(500, 600, dict(a=10., b=0.01, c=0.00002, d=0.000000032)) 
<Quantity(2693.46667, 'joule / mole')>

DeltaS_IG requires the temperature and pressure of state 1, the temperature and pressure of state 2, the ideal-gas heat-capacity argument.

>>> from sandlermisc import DeltaS_IG 
>>> DeltaS_IG(500, 10, 600, 12, 10)                
<Quantity(0.307309799, 'joule / mole / kelvin')>

One can optionally provide a value for the gas constant R to match units of one's Cp, if necessary. By default, sandlermisc assumes Cp has energy units of J.

Release History

• 0.4.1
  • pint incorporation
  • Full smart-resolution of ThermodynamicState
• 0.3.2
  • bugfix: unpackCp ignored ints -- now fixed
  • bugfix: unpackCp ignored np.ndarray -- now fixed
• 0.3.0
  • StateReporter implemented
• 0.1.1
  • bug in converting Cp
• 0.1.0
  • Initial release

Meta

Cameron F. Abrams – cfa22@drexel.edu

Distributed under the MIT license. See LICENSE for more information.

https://github.com/cameronabrams

Contributing

1. Fork it (https://github.com/cameronabrams/sandlermisc/fork)
2. Create your feature branch (git checkout -b feature/fooBar)
3. Commit your changes (git commit -am 'Add some fooBar')
4. Push to the branch (git push origin feature/fooBar)
5. Create a new Pull Request