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 7
... held constant . FIGURE 8. Effectiveness of the louvered strip mixing device relative to the spacing between mixing elements . ( OVERALL DISTANCE : 4.75 DUCT DIAMETERS ) MEAN AIR. ( % ) 100 96.2 % 90 90.2 % 80 70 EFFECTIVENESS 50 60 50 ...
... held constant . FIGURE 8. Effectiveness of the louvered strip mixing device relative to the spacing between mixing elements . ( OVERALL DISTANCE : 4.75 DUCT DIAMETERS ) MEAN AIR. ( % ) 100 96.2 % 90 90.2 % 80 70 EFFECTIVENESS 50 60 50 ...
Page 8
... held constant at 2.0 duct diameters . FIGURE 9. Effectiveness of the louvered strip mixing device as the overall distance from the inlet of the mixing device to the downstream measuring station was varied . Measurements were also made ...
... held constant at 2.0 duct diameters . FIGURE 9. Effectiveness of the louvered strip mixing device as the overall distance from the inlet of the mixing device to the downstream measuring station was varied . Measurements were also made ...
Page 11
... held constant . FIGURE 14. Effectiveness of the louver - baffle mixing device relative to the spacing between mixing elements . EFFECTIVENESS ( % ) 100 90 80 70 70 O CONCENTRIC TEMPERATURE PATTERN △ QUADRANT TEMPERATURE PATTERN ( THREE ...
... held constant . FIGURE 14. Effectiveness of the louver - baffle mixing device relative to the spacing between mixing elements . EFFECTIVENESS ( % ) 100 90 80 70 70 O CONCENTRIC TEMPERATURE PATTERN △ QUADRANT TEMPERATURE PATTERN ( THREE ...
Page 14
... held in a fixed position and the location of the second mixing element with respect to the first was varied . The results illustrated in figure 21 show that effec- tive mixing was gained when the elements were placed approximately two ...
... held in a fixed position and the location of the second mixing element with respect to the first was varied . The results illustrated in figure 21 show that effec- tive mixing was gained when the elements were placed approximately two ...
Page 15
... held constant . FIGURE 21. Effectiveness of the concentric louver mixing device relative to the spacing between mixing elements . EFFECTIVENESS ( % ) 100 80 2.0 DISTANCE MEA SURING 3.0 O CONCENTRIC TEMPERATURE PATTERN △ QUADRANT ...
... held constant . FIGURE 21. Effectiveness of the concentric louver mixing device relative to the spacing between mixing elements . EFFECTIVENESS ( % ) 100 80 2.0 DISTANCE MEA SURING 3.0 O CONCENTRIC TEMPERATURE PATTERN △ QUADRANT ...
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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