Performance of Louvered Devices as Air MixersU.S. National Bureau of Standards, 1970 - 20 pages As part of a study evaluating methods for reducing thermal gradients within the cross section of an air stream, three louvered mixing devices were investigated. Each of these devices was found to be capable of reducing the cross-sectional nonuniformity of air temperature to a few percent of the entering value. |
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Page 1
... duct diameters , respectively , to reach a mixing effectiveness level of 97 percent . The mixing effectiveness of the louvered strip and concentric louver models was independent of the approach velocity , whereas the effectiveness of ...
... duct diameters , respectively , to reach a mixing effectiveness level of 97 percent . The mixing effectiveness of the louvered strip and concentric louver models was independent of the approach velocity , whereas the effectiveness of ...
Page 7
... duct diameters from the inlet of the mixing device to the downstream station was held constant . FIGURE 8. Effectiveness of the louvered strip mixing device ... ( DUCT DIAMETERS ) EFFECTIVENESS ( % ) 100t 2.0 3.0 O CONCENTRIC TEMPERATURE 7.
... duct diameters from the inlet of the mixing device to the downstream station was held constant . FIGURE 8. Effectiveness of the louvered strip mixing device ... ( DUCT DIAMETERS ) EFFECTIVENESS ( % ) 100t 2.0 3.0 O CONCENTRIC TEMPERATURE 7.
Page 8
... DIAMETERS ) MEAN AIR STREAM VELOCITY IN THE TWO FOOT DIAMETER DUCT ( FPM ) FIGURE 10. Relation of mixer inlet ... ( DUCT DIAMETERS ) The distance between the mixing elements was held constant at 2.0 duct diameters . FIGURE 9. Effectiveness ...
... DIAMETERS ) MEAN AIR STREAM VELOCITY IN THE TWO FOOT DIAMETER DUCT ( FPM ) FIGURE 10. Relation of mixer inlet ... ( DUCT DIAMETERS ) The distance between the mixing elements was held constant at 2.0 duct diameters . FIGURE 9. Effectiveness ...
Page 10
... duct diameter between ele- ments provided sufficient spacing to accomplish good mixing . With the elements located 0.92 duct diameter apart , measurements were taken to determine mixer performance as the overall distance varied . For ...
... duct diameter between ele- ments provided sufficient spacing to accomplish good mixing . With the elements located 0.92 duct diameter apart , measurements were taken to determine mixer performance as the overall distance varied . For ...
Page 11
... DUCT DIAMETERS MEAN VELOCITY : 450 FPM 80 0.5 1.0 1.5 DISTANCE BETWEEN MIXING ELEMENTS ( DUCT DIAMETERS ) The overall distance of 2.5 duct diameters from the inlet of the mixing device to the downstream measuring station was held ...
... DUCT DIAMETERS MEAN VELOCITY : 450 FPM 80 0.5 1.0 1.5 DISTANCE BETWEEN MIXING ELEMENTS ( DUCT DIAMETERS ) The overall distance of 2.5 duct diameters from the inlet of the mixing device to the downstream measuring station was held ...
Common terms and phrases
0.92 duct diameter 4.75 DUCT DIAMETERS air flow Air Mixers air passed AIR STREAM VELOCITY apparatus ASHRAE automatic data processing baffles blower Building Science Series Bureau of Standards cents circular band concentric louver mixing CONCENTRIC TEMPERATURE PATTERN cross section deg F Devices as Air DIAMETER DUCT FPM DIAMETERS MEAN VELOCITY direct the air DISTANCE BETWEEN MIXING downstream measuring station Duct Diam DUCT DIAMETERS MEAN duct wall elements in series evaluated FIGURE 17 flow rate held constant louver angle louver mixing device LOUVER SETTING louver-baffle mixing device louvered strip mixing MEAN AIR STREAM ment metal mixing effectiveness National Bureau normal path outer area path of flow PATTERN THREE QUADRANTS percent pitot-static tubes QUADRANT COOL QUADRANT TEMPERATURE PATTERN Resistance Thermometer shown in figure spacing between mixing standard deviation strip mixer strip mixing device tempera temperature difference TEMPERATURE PATTERN THREE test conditions THERMOCOUPLES THREE QUADRANTS WARM tion ture U.S. Government Printing velocity head
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Page 1 - A schematic of the apparatus is shown in figure 1. Figure 2 is a photograph of the apparatus.
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