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
... spacing between mixing elements . ( OVERALL DISTANCE : 4.75 DUCT DIAMETERS ) MEAN AIR. ( % ) 100 96.2 % 90 90.2 % 80 70 EFFECTIVENESS 50 60 50 TEMPERATURE PATTERNS 99.0 % ( T and represent areas at different temperatures ) FIGURE 7 ...
... spacing between mixing elements . ( OVERALL DISTANCE : 4.75 DUCT DIAMETERS ) MEAN AIR. ( % ) 100 96.2 % 90 90.2 % 80 70 EFFECTIVENESS 50 60 50 TEMPERATURE PATTERNS 99.0 % ( T and represent areas at different temperatures ) FIGURE 7 ...
Page 8
... spacing between mixing elements was 2.0 duct diameters , and the downstream measuring station was 4.75 duct diameters from the first mixing element . The loss of static head due to the presence of a mixing device in the duct system was ...
... spacing between mixing elements was 2.0 duct diameters , and the downstream measuring station was 4.75 duct diameters from the first mixing element . The loss of static head due to the presence of a mixing device in the duct system was ...
Page 10
... 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 temperature patterns of concentric and quadrant ...
... 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 temperature patterns of concentric and quadrant ...
Page 11
... spacing between mixing elements . EFFECTIVENESS ( % ) 100 90 80 70 70 O CONCENTRIC TEMPERATURE PATTERN △ QUADRANT TEMPERATURE PATTERN ( THREE QUADRANTS WARM AND ONE QUADRANT COOL ) MEAN VELOCITY : 450 FPM 60 1.0 2.0 3.0 4.0 5.0 ...
... spacing between mixing elements . EFFECTIVENESS ( % ) 100 90 80 70 70 O CONCENTRIC TEMPERATURE PATTERN △ QUADRANT TEMPERATURE PATTERN ( THREE QUADRANTS WARM AND ONE QUADRANT COOL ) MEAN VELOCITY : 450 FPM 60 1.0 2.0 3.0 4.0 5.0 ...
Page 14
... spacing down to one duct diameter . Tests using a spacing of two duct di- ameters between mixing elements showed that the overall distance from the first mixing ele- ment to the point of maximum observed uni- formity was 4.75 duct ...
... spacing down to one duct diameter . Tests using a spacing of two duct di- ameters between mixing elements showed that the overall distance from the first mixing ele- ment to the point of maximum observed uni- formity was 4.75 duct ...
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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