"A recently uncovered patent by Albert Einstein issued Nov. 11, 1930 discloses a single pressure thermally driven refrigeration cycle which does not require a pump. It accomplishes this by using a triple mixture of butane, ammonia, and water. Butane acts as the refrigerant, and ammonia acts as an inert gas creating low partial pressure for the butane in the evaporator to provide low temperature refrigeration. Water serves as the absorbent to separate the ammonia from the butane. A literature search has provided only one brief reference to this unique cycle. The analysis of the cycle was accomplished via a computer model which calculates operating characteristics such as efficiency, operating temperature ranges, and specific cooling output"
"Analysis of this cycle shows the potential COP to be quite high relative to the ammonia-water-hydrogen cycles widely used today. Current ammonia-water-hydrogen cycles have COP's around 0.1, and the COP's calculated for the Einstein cycle were as high as 0.4. "
Frederick
