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 3
... distribution within the cross section of the test stream . 3. Description of Mixing Devices 4. Performance. T T t T AND 2.1 . Instrumentation Temperature measurements were made at each of two stations . Measuring station No. 1 ( see fig ...
... distribution within the cross section of the test stream . 3. Description of Mixing Devices 4. Performance. T T t T AND 2.1 . Instrumentation Temperature measurements were made at each of two stations . Measuring station No. 1 ( see fig ...
Page 5
... distribution were made for each set . An average upstream stan- dard deviation and an average downstream standard deviation were obtained from the five sets . A value of effectiveness , which would give an indication of mixing ...
... distribution were made for each set . An average upstream stan- dard deviation and an average downstream standard deviation were obtained from the five sets . A value of effectiveness , which would give an indication of mixing ...
Page 6
... distribution . The temperature patterns are shown in figure 7. The right and left patterns in figure 7 represent situations where a maximum nonuniformity of 50 percent warm and 50 percent cool air occurs . A pat- tern , which might be ...
... distribution . The temperature patterns are shown in figure 7. The right and left patterns in figure 7 represent situations where a maximum nonuniformity of 50 percent warm and 50 percent cool air occurs . A pat- tern , which might be ...
Page 7
... distribution . With the con- centric pattern , the 99.0 percent effectiveness of the mixer approached very nearly the limi- tation of the temperature - measuring system . It was also of interest to determine how the magnitude of an ...
... distribution . With the con- centric pattern , the 99.0 percent effectiveness of the mixer approached very nearly the limi- tation of the temperature - measuring system . It was also of interest to determine how the magnitude of an ...
Page 8
... distribution pattern , the effectiveness de- creased from 96 to 93 percent for the respec- tive settings of 60 ° and ... distributions , were used in evaluating the performance of the louver - baffle mixing de- vice . Shown in figure 12 ...
... distribution pattern , the effectiveness de- creased from 96 to 93 percent for the respec- tive settings of 60 ° and ... distributions , were used in evaluating the performance of the louver - baffle mixing de- vice . Shown in figure 12 ...
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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