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. |
From inside the book
Results 1-5 of 8
Page 2
... position a short distance upstream from the section shown as B - B in figure 1. The partitions in the circular duct di- vided the duct space or air stream into four equal pie - shaped quadrants . The portions of the apparatus ...
... position a short distance upstream from the section shown as B - B in figure 1. The partitions in the circular duct di- vided the duct space or air stream into four equal pie - shaped quadrants . The portions of the apparatus ...
Page 3
... positions in the cross - sectional area of the rectangular inlet duct . The duct had a straight length of 8 ft ahead of the station of measurement . The pressures from the pitot - static tubes were measured with a Hook gage , which ...
... positions in the cross - sectional area of the rectangular inlet duct . The duct had a straight length of 8 ft ahead of the station of measurement . The pressures from the pitot - static tubes were measured with a Hook gage , which ...
Page 7
... position the ele- ments should be located with respect to each other for best mixing . Tests were made to de- termine the optimum placement by varying the location of the second element with respect to the first element . Figure 8 shows ...
... position the ele- ments should be located with respect to each other for best mixing . Tests were made to de- termine the optimum placement by varying the location of the second element with respect to the first element . Figure 8 shows ...
Page 8
... positions . The results illustrated in figures 7 to 10 inclusive are for a position of 60 ° from the normal path of flow along the axis of the duct . Using the quadrant tempera- ture distribution pattern , the effectiveness de- creased ...
... positions . The results illustrated in figures 7 to 10 inclusive are for a position of 60 ° from the normal path of flow along the axis of the duct . Using the quadrant tempera- ture distribution pattern , the effectiveness de- creased ...
Page 12
... positions from 0 ° , or along the axis of the duct , to 65 ° from the axis . As shown in figure 17 , the observed effectiveness was maximum at a setting of 60 ° . Beyond 60 ° the pressure drop became prohibitively high without an ...
... positions from 0 ° , or along the axis of the duct , to 65 ° from the axis . As shown in figure 17 , the observed effectiveness was maximum at a setting of 60 ° . Beyond 60 ° the pressure drop became prohibitively high without an ...
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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