How to keep the cold

Distinguish moving heat from resisting heat transfer.

1. 01

   Find the warm side

   Count the removed heat and the supplied work.

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2. 02

   Slow the transfer

   Change wall thickness, then reverse the temperatures.

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3. 03

   Turn electrical work into motion

   Connect the compressor’s work input to a motor’s mechanism.

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Take these steps at your own pace. Your place is not saved as account progress or scored.