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.
Marcel Audiffren
Marcel Audiffren, was a French priest, physicist, and inventor who promoted the residential refrigerator. He served as abbot of his Cistercian monastery, and originally designed a hand-cranked device for cooling liquid, such as wine, for his monks.