Gantry portal and heat pump: what they have in common

1. Step 1. Gantry portal — is part of — Portal crane. A U-shaped support over the tracks.
2. Step 2. Portal crane — has part — Wire rope. The load hangs on steel cables.
3. Step 3. Wire rope — is part of — Mine hoist. Mine ropes were the first use of wire rope.
4. Step 4. Mine hoist — has part — Watt steam engine. Steam winding engines.
5. Step 5. Watt steam engine — inspired — Thermodynamics. Carnot wrote “Reflections on the Motive Power of Fire” trying to understand steam engines.
6. Step 6. Thermodynamics — is used in — Heat pump. A heat pump moves heat from cold to warm by spending work — by the laws of thermodynamics.

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