2013 Volume 41 Issue 12 Pages 705-715
In recent years the fan heater is used for industry and residence, it is necessary for fan heater to become smaller, lighter, and more silent. However there are problems that the fan heater size is very large, and the noise is very high due to air pressure loss of heat exchangers. Therefore we have been developing the centrifugal type fan with function of heat exchanger. The features of this new type fan heater are that the fan heater size is very small and silent because the fan and the heat exchanger are installed in one body. This paper described the effects of number of fan blades on heat transfer characteristics of the centrifugal fan with the function of heat exchanger. The heat transfer characteristics of the centrifugal fan having different number of blades(number of blades：12, 20, 28)were clarified by measuring heat flux and blade's surface temperature. In results, the heat transfer coefficient increased with number of blades.
