Although face validation is quick cut and dry method to determining the validity it maybe in your best interested to try at least two other methods for validating your model. Two methods that I think could be of interest to you would be to use the historial data. This way you compare to see if the model is a true representation of the environment. The second method would be to used fixed values first on items in the model and through some simple calculations you can see that your model is running correctly.
Good Luck
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