Finding the Pinch — Targeting Minimum Utilities7 / 17
The Golden Rules: Don't Cross the Pinch
The three rules that keep a design at its true minimum utility — and the energy penalty of breaking each one.
10 min read · Jacob Willis, Net Zero Lead · Last reviewed July 2026
The previous lesson split every process into two regions: above the pinch (a net heat sink, needing only hot utility) and below the pinch (a net heat source, needing only cold utility). From that single fact, three design rules follow, and breaking any one of them carries a penalty you can calculate exactly.
In this lesson
- 01The three golden rules
- 02Quantifying the penalty
- 03Why this happens so often in practice
- 04Sources and further reading