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Welcome to a new installment of Hot Topics and Cool Concepts in HVAC. Did you know that Albert Einstein, the most famous scientist in history, actually invented a refrigerator? In this episode, we share the surprising story of why he did it, how it works, and why it is making a big comeback today.
Back in 1926, a tragic news story shocked the city of Berlin. An entire family died in their sleep because the pump on their kitchen refrigerator broke, leaking deadly gases into their home. Albert Einstein and his brilliant student, Leo Szilard, decided they had to fix this dangerous problem. They realized that the best way to make a refrigerator safe was to get rid of the moving parts entirely. If there is no moving pump, there are no seals to break, and no gas can leak out.
So, how do you make a refrigerator cool things down without a pump? You use heat. Einstein and Szilard designed a system that used a small flame, like a pilot light on a stove, instead of electricity. They mixed three everyday liquids and gases together: butane, ammonia, and water. When the flame heated the mixture, it caused the liquids to evaporate and separate. This chemical reaction naturally soaked up the heat from inside the fridge, making it freezing cold. Because the liquids just kept recycling through the pipes on their own, the machine was comparatively safe.
Even though it was a genius invention, it never became popular in the 1930s. A new, safer gas called Freon was invented right around the same time, which made regular refrigerators safe enough for homes. Plus, Einstein had to flee Germany due to political danger, so the project was abandoned.
But the story does not end there. Today, Einstein's refrigerator is waking up. Because it runs on heat instead of electricity, modern engineers are pairing it with solar power. It is now being used to keep food and vaccines cold in hot, remote areas of the world that do not have electricity.
