. Comparative test of centrifugal blowers. 1 - 22 - I. r. i: (I I 11 5-) n (I ^ r c r I r r suction orifice • If the two impellers are comparedwith the orifice and at 1600 »M. it is interestingto note that the curved blade shows a velocity headof inches of water as compared with inchesfor the straight blade or in increase of .24 inchesfavoring the curved blade impeller. General entire test is very much in favor of thecurved blade impeeler, both for capacity and ef-ficiency. An installation of two fans of the samecapacity, but of the two individual designs, wouldlea
. Comparative test of centrifugal blowers. 1 - 22 - I. r. i: (I I 11 5-) n (I ^ r c r I r r suction orifice • If the two impellers are comparedwith the orifice and at 1600 »M. it is interestingto note that the curved blade shows a velocity headof inches of water as compared with inchesfor the straight blade or in increase of .24 inchesfavoring the curved blade impeller. General entire test is very much in favor of thecurved blade impeeler, both for capacity and ef-ficiency. An installation of two fans of the samecapacity, but of the two individual designs, wouldleave a large margin in favor of the ciirved; firstgro\xnd space and second input horsepower, for atthe best efficiency of the curved impeller 12fo ofthe power is saved by ttte style of runner, equivalentto about l/8th of the entire input. The capacityof the curved balde is also much larger, for at1600 , this type of fan delivered 62-1/2 cubicfeet of free air as against cubic feet for thestraight blade. - 23 - ,: r /, f rc f •. ^^~comparativetesto00grif
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