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 1
... air streams has long posed a problem to investigators trying to make accurate measurements of air - stream temperature . Several mixing devices have been developed and many rather complicated designs have been devised to promote ...
... air streams has long posed a problem to investigators trying to make accurate measurements of air - stream temperature . Several mixing devices have been developed and many rather complicated designs have been devised to promote ...
Page 2
... AIR STREAM AT DIFFERENT TEMPERATURES FIGURE. QUADRANT PARTITION QUADRANT AIR MIXER QUADRANTS END HERE MEASURING STATION # B WATER VAPOR INLETS BASE HEATER A 4 TRIMMER HEATER QUADRANTS BEGIN HEE INLET BLOWER کالے O STRAIGHTENING TUBES ...
... AIR STREAM AT DIFFERENT TEMPERATURES FIGURE. QUADRANT PARTITION QUADRANT AIR MIXER QUADRANTS END HERE MEASURING STATION # B WATER VAPOR INLETS BASE HEATER A 4 TRIMMER HEATER QUADRANTS BEGIN HEE INLET BLOWER کالے O STRAIGHTENING TUBES ...
Page 3
... AIR STREAM AT DIFFERENT TEMPERATURES FIGURE 3. Patterns of temperature 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 ...
... AIR STREAM AT DIFFERENT TEMPERATURES FIGURE 3. Patterns of temperature 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 ...
Page 4
... air could flow . A pattern of turbulence was set up by the ac- tion of the adjacent layers of air moving in op- posing directions . Two of the louver - baffle ele- ments were used in series . Through the first element the air stream was ...
... air could flow . A pattern of turbulence was set up by the ac- tion of the adjacent layers of air moving in op- posing directions . Two of the louver - baffle ele- ments were used in series . Through the first element the air stream was ...
Page 6
... stream Meas . Station * Shaded area represents a temperature different from the unshaded area . To assist readers interested in making use of the coherent system of SI units , the exact conversion factors to be used with the above table ...
... stream Meas . Station * Shaded area represents a temperature different from the unshaded area . To assist readers interested in making use of the coherent system of SI units , the exact conversion factors to be used with the above table ...
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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