Improvement of inlet air flow determination

[IsaacLeis]

DrumDryer changes

The R factor (kg air/kg water evaporated) led to unfeasible relative humidities. Now air flow is calculated based on the water evaporated and RH factor (relative humidity expressed as fraction). The equations used to calculate the total amount of air were the followings:

$$ \mathrm{RH} = \frac{p_{H_2O}}{p_{H_2O}^{\text{sat}}(T)} \quad \text{with} \quad p_{H_2O} = y_{H_2O} \cdot P \quad \text{;} \quad y_{H_2O} = \frac{n_{H_2O}}{n_{\text{air}} + n_{\text{volatiles}} + n_{H_2O}} $$

DrumDryer test

Tests to check relative humidity and energy balances were added.

[yoelcortes]

@IsaacLeis, this is excellent! I will review in detail today/tomorrow and get back to you shortly.

[yoelcortes]

Everything looks good!

I had some trouble adding my minor edits to the pull request. Possibly, I might not have access to your branch and would need to make a pull request instead, which would be a hassle.

Instead, I will merge and add my edits to the master branch in BioSTEAM. The tests were not touched, just minor changes to the dryer code. Please feel free to check it out later.

I will go ahead and add you as a contributor to BioSTEAM so you can make branches directly in this repo. This should streamline PRs on both sides.

Thank you again!

[yoelcortes]

@IsaacLeis, just sent you an invite to be a collaborator in BioSTEAM. Then you can create branches and contribute more directly.

Thanks,