Ceiling fans as extenders of the summer comfort envelope

摘要: The ASHRAE Standard 55-1981 specifies temperature limits or zones for winter and summer comfort. It states that the upper limit of comfort zone, which is 79/sup 0/F 26/sup 0/C, can be extended to 82/sup 28/sup 0/C with air velocities 160 fpm 0.8 m/s. manufacturers ceiling fans claim may obtained at considerably below (0.8 m/s) level. They further (28/sup 0/C) a fan will provide same amount as 75/sup (24/sup without fan. Since require less than penny per hour operate, their use, opposed conditioning, could represent large energy savings affecting human National Bureau Standards suggests reduction in conditioning demand 3%//sup (5.4%/C). Thus saving provided by 140 (0.7 from would 5.6/sup X = 17%. it was concluded extend envelope (26/sup 85/sup (29/sup (the equivalent on any specific situationmore » depends velocity person). results suggest turbulent variable characteristics plume its major comfort-producing feature.« less