Science and technology of the Tang dynasty
The inventor Ding Huan (fl. 180 AD) of the Han dynasty invented a rotary fan for air conditioning, with seven wheels 3 m (10 ft) in diameter and manually powered. In 747, Emperor Xuanzong had a "Cool Hall" built in the imperial palace, which the "Tang Yulin" (唐語林) describes as having water-powered fan wheels for air conditioning as well as rising jet streams of water from fountains. During the subsequent Song dynasty, written sources mentioned the air conditioning rotary fan as even more widely used.
Reuben Trane
Reuben Trane was born in La Crosse, Wisconsin. He graduated from La Crosse Central High School in 1906. In 1910, he graduated from the University of Wisconsin–Madison with a degree in Mechanical Engineering. In 1913, James and Reuben incorporated The Trane Company. In 1923, Reuben Trane invented the convector radiator. From 1916 until 1951, Reuben Trane was President of Trane. From 1951 until his death in 1954, Reuben Trane was chairman of the board of Trane. He was a member of the Institution of Heating and Ventilating Engineers and of the American Society of Heating and Ventilating Engineers (ASHRAE), to which he was awarded a lifetime membership in 1951. Reuben N. Trane was inducted into the ASHRAE Hall of Fame in 1997.