Some producers also added a finishing pan, a separate batch evaporator, as a final stage in the evaporation process.

This would be consistent your observation that there is no "boiling" the second time you carried out the evaporation process.

The evaporation process also concentrates the nutrients and the food energy.

But that same evaporation process left less for workers to clean up.

This page gives a very nice description of the evaporation process:

He also placed a heat lamp on top to speed up the evaporation process.

This means the evaporation process will consume more energy per second.

"Mother Nature has cooperated beautifully with calm conditions and bright sun, which speeds up the evaporation process."

These notes are created carefully with knowledge of the evaporation process of the perfume.

He subsequently developed a salt extraction business, using an evaporation process.