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Professor London was an authority on compact heat exchangers. Typically, they are devices that remove unwanted heat from engines and disperse it into the air. The most common compact heat exchangers are the radiators in automobiles, but they are also used in airplane engines, refrigerators, computers, and gas turbines to produce electricity.

Professor London was the first to organize the field of compact heat exchangers. He was helped by Bill Kays, a former student who eventually became dean of engineering at Stanford University. Together, they wrote the book Compact Heat Exchangers (Academic Press, 1978), which became a prominent reference used all around the world. It utilizes the concept of Number of Transfer Units (NTUs) to simplify the determination of heat exchanger effectiveness and covers a multitude of configurations and extended surfaces. Professor London wrote another book with R. K. Shak, Laminar Flow Forced Convection in Ducts.

Professor London was a member of the American Society of Mechanical Engineers (ASME), a member of Sigma Xi, a life member of the American Society for Engineering Education, a member of the American Society of Naval Engineers, and a member of the American Association of University Professors. That large number of memberships speaks for his diversity of interests.

Professor London was a real, practical teacher. He took his students on field trips to power plants, electrical switching stations, oil platforms, and such applications as aircraft engines. He was tough, and he did not hesitate to mark student papers with NONSENSE in red ink. At technical meetings he would get up and tell the speaker that he was violating the fundamental laws of thermodynamics: The “secret” he transmitted to his students was that they needed to take the system they were studying and “put it in a box,” better known as control volume. Then they should apply the basic principles of physics to that control volume and learn whatever they needed to know about the system. Professor London was a craftsman as he demonstrated his analysis methods on energy

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