Spring and heat pump: what they have in common

1. Step 1. Spring — is part of — Bogie. Spring suspension.
2. Step 2. Bogie — is part of — Refrigerator car. Bogies.
3. Step 3. Refrigerator car — uses — Vapour-compression cycle. Later — refrigeration machines.
4. Step 4. Vapour-compression cycle — is used in — Heat pump. The same cycle as in a refrigerator.

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