We stopped pretending.
Not because the calculations were wrong. Not because engineers were careless. But because too much of the thinking behind good engineering work was being lost.
A calculation gets issued. The result is there. The cooling load, the airflow, the pipe size, the pressure drop — all neatly sitting in the report.
But later, when someone asks "Where did this number come from?", the real work begins again. We open the spreadsheet. The tabs are messy. The formulas are buried. The named ranges have drifted. The assumption might be in a cell note, an old email, a copied template, or somewhere in the memory of the engineer who made the call at 11 p.m. because the deadline was the next morning.
The engineering was done. But the reasoning was not always preserved.
That is the quiet problem many engineers know too well. We spend years learning thermodynamics, heat transfer, fluid mechanics, psychrometrics, pressure loss, energy, safety, and design judgement. Then too much of the work becomes repairing someone else's Excel template, copying vendor data, checking hidden formulas, or sitting in row 47 trying to understand a black box built years ago.
And the assumptions? A junior asks why a value is used. The answer becomes, "That is what we normally use." Sometimes that value is reasonable. Sometimes it comes from experience. But if the trail is not visible, the judgement becomes harder to teach, harder to review, and harder to defend.
That is why we started building DENOVA. Not to replace engineers. To support them. To make calculations faster, clearer, and easier to stand behind.
Because engineering calculations should not just give an answer. They should show how the answer was built.