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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Results 1-5 of 13
Page
... mixing devices 3.1 . Louvered strip 3.2 . Louver - baffle 3.3 . Concentric louver 4. Performance 133 3 3 4 4 5 4.1 . Louvered strip 5 4.2 . Louver - baffle 8 4.3 . Concentric louver 13 4.3.1 Applications of the concentric louver mixer ...
... mixing devices 3.1 . Louvered strip 3.2 . Louver - baffle 3.3 . Concentric louver 4. Performance 133 3 3 4 4 5 4.1 . Louvered strip 5 4.2 . Louver - baffle 8 4.3 . Concentric louver 13 4.3.1 Applications of the concentric louver mixer ...
Page 1
... louvered - baffle ) required 4.75 , 3.8 , and 3.0 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 ...
... louvered - baffle ) required 4.75 , 3.8 , and 3.0 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 ...
Page 3
... louvers for deflecting the air from its normal path . Louvers were designed so that FIGURE 4. A view of the louvered strip mixing device 3 Instrumentation Conditioning and control Description of mixing devices Louvered strip.
... louvers for deflecting the air from its normal path . Louvers were designed so that FIGURE 4. A view of the louvered strip mixing device 3 Instrumentation Conditioning and control Description of mixing devices Louvered strip.
Page 4
... mixing device . Two louvered strip mixers of this construc- tion were placed in series for this study . The first mixer provided shearing action in the hori- zontal plane . The second , rotated 90 ° in res- pect to the first mixer and ...
... mixing device . Two louvered strip mixers of this construc- tion were placed in series for this study . The first mixer provided shearing action in the hori- zontal plane . The second , rotated 90 ° in res- pect to the first mixer and ...
Page 5
... mixing element . Through the shearing movement of the rotat- ing air streams , a general condition of mixing or ... Louvered Strip Table 1 is a summary compilation of all of the tests conducted on the louvered strip mix- ing device ...
... mixing element . Through the shearing movement of the rotat- ing air streams , a general condition of mixing or ... Louvered Strip Table 1 is a summary compilation of all of the tests conducted on the louvered strip mix- ing device ...
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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