Implement IEER calculation through interpolation for multistage units (Part II)

[lymereJ]

Supersedes #121 and #124. The changes in this PR are functional but the code needs to be cleaned-up before merging.

[lymereJ]

black has not been applied, but unit test run successfully locally.

[lymereJ]

@aowabinr @wanhanlong1130 - Ok, tests are passing and I took a pass at doing some cleanup and adding docs. Please review it when you have time.

[wanhanlong1130]

@lymereJ I saw you blocked control_power_unit, do we need to add it to the class?

[wanhanlong1130]

unitarydirectexpansion.py, line 190, I suggest change "aed, self.aew, ect, lct = self.get_rated_temperatures()" to "_, self.aew, ect, _= self.get_rated_temperatures()" since aed and lct are not used.

[wanhanlong1130]

test_unitarydirectexpansion.py, line 380, "assert abs(set_of_curves[0].evaluate(19.44, 35) - 0.99) < 0.011" should that be "<0.001"?

[lymereJ]

@lymereJ I saw you blocked control_power_unit, do we need to add it to the class?

We can add it, I wanted to keep it simple for now since this is mostly for the AHRI test.

unitarydirectexpansion.py, line 190, I suggest change "aed, self.aew, ect, lct = self.get_rated_temperatures()" to "_, self.aew, ect, _= self.get_rated_temperatures()" since aed and lct are not used.

Thanks! I'll make the change.

test_unitarydirectexpansion.py, line 380, "assert abs(set_of_curves[0].evaluate(19.44, 35) - 0.99) < 0.011" should that be "<0.001"?

I'm not sure if it'd pass. Let me try it locally and if it does, I'll make that change as well.

[lymereJ]

Comments were addressed.