In 1930, Albert Einstein and Leo Szilard were awarded a United States Patent for a heat pump that required no electricity, has no moving parts, and was powered by a heat source.  Heat pumps, including refrigerators, are counterintuitive devices in general because heat is not a tangible thing that can be carried by hand from one place to another, so some kind of thermodynamic trick must always be used in a heat pump.  This poster will discuss the Einstein-Szilard refrigerator and recent attempts to construct a working model.

Einstein-Szilard absorption refrigerator: Marvel of thermodynamics

243rd National Meeting (2012)

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