Add heat exchanger performance and cost components

[bayc]

Add HX performance and cost components

This PR adds a simple heat exchanger model, along with a preliminary cost-scaling model.

Section 1: Type of Contribution

• Feature Enhancement
  • Framework
  • New Model
  • Updated Model
  • Tools/Utilities
  • Other (please describe):
• Bug Fix
• Documentation Update
• CI Changes
• Other (please describe):

Section 2: Draft PR Checklist

• Open draft PR
• Describe the feature that will be added
• Fill out TODO list steps
• Describe requested feedback from reviewers on draft PR
• Complete Section 7: New Model Checklist (if applicable)

TODO:

• Have TLDRD team review implementation of model.
• Add documentation.
• Determine whether an example is needed now or later (once other heat components get added).
• Re-work the tests to be more streamlined in the checking of asserts.
• Ask for reviews from H2I team once above are complete.

Type of Reviewer Feedback Requested (on Draft PR)

Structural feedback:

• Feedback on the addition of a heat folder to the converters directory.

Implementation feedback:

• Feedback on the testing methods once they are updated (not yet).

Other feedback:

Section 3: General PR Checklist

• PR description thoroughly describes the new feature, bug fix, etc.
• Added tests for new functionality or bug fixes
• Tests pass (If not, and this is expected, please elaborate in the Section 6: Test Results)
• Documentation
  • Docstrings are up-to-date
  • Related docs/ files are up-to-date, or added when necessary
  • Documentation has been rebuilt successfully
  • Examples have been updated (if applicable)
• CHANGELOG.md has been updated to describe the changes made in this PR

Section 3: Related Issues

Section 4: Impacted Areas of the Software

Section 4.1: New Files

• path/to/file.extension
  • method1: What and why something was changed in one sentence or less.

Section 4.2: Modified Files

• path/to/file.extension
  • method1: What and why something was changed in one sentence or less.

Section 5: Additional Supporting Information

Section 6: Test Results, if applicable

Section 7 (Optional): New Model Checklist

• Model Structure:
  • Follows established naming conventions outlined in docs/developer_guide/coding_guidelines.md
  • Used attrs class to define the Config to load in attributes for the model
    • If applicable: inherit from BaseConfig or CostModelBaseConfig
  • Added: initialize() method, setup() method, compute() method
    • If applicable: inherit from CostModelBaseClass
• Integration: Model has been properly integrated into H2Integrate
  • Added to supported_models.py
  • If a new commodity_type is added, update create_financial_model in h2integrate_model.py
• Tests: Unit tests have been added for the new model
  • Pytest-style unit tests
  • Unit tests are in a "test" folder within the folder a new model was added to
  • If applicable add integration tests
• Example: If applicable, a working example demonstrating the new model has been created
  • Input file comments
  • Run file comments
  • Example has been tested and runs successfully in test_all_examples.py
• Documentation:
  • Write docstrings using the Google style
  • Model added to the main models list in docs/user_guide/model_overview.md
    • Model documentation page added to the appropriate docs/ section
    • <model_name>.md is added to the _toc.yml

[bayc]

Remove autodoc string language.

[bayc]

Make tolerances uniform.

[alidor-nrel]

I don't know the source for this function, I would rather use something from a chemical plant design handbook.
From Sinott and Towler (2021):
U-tube shell and tube HX:
a+b*S^n
a = 28000
b = 54
n = 1.2
S - heat transfer area in m^2
limits: 10 m^2 <= S <= 1000 m^2

This is in CEPCI index = 532.9 so need to be converted (it's for Jan. 2010)
It also assums simple carbon steel, so we need to account for materials once temperatures are higher
For the OpEx I am not sure we want to include it in a cost function, this should be in the general economic calculation (like ProFAST)

[alidor-nrel]

Do we want to add installation factor in here, or are those things usually accounted for elsewhere in H2I analysis?
I think in ther steel paper at least the cost functions are for totat installed costs