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
... constant tempera- ture was drawn into the inlet blower at a con- trolled rate . Downstream from the blower , just 1 Figures in brackets indicate the literature references at the end of this paper . QUADRANT PARTITION QUADRANT AIR MIXER ...
... constant tempera- ture was drawn into the inlet blower at a con- trolled rate . Downstream from the blower , just 1 Figures in brackets indicate the literature references at the end of this paper . QUADRANT PARTITION QUADRANT AIR MIXER ...
Page 2
... CONSTANT VOLTAGE TRANSFORMER 230 v 115 v CONTROL - 115 v 24x24 in DUCT 24 in dam DUCT THERMOCOUPLES B - B C - C BASE HEATER INSULATION INSULATION CONDITIONED AIR INLET FIGURE 2. Overall view of assembled test apparatus . after an ...
... CONSTANT VOLTAGE TRANSFORMER 230 v 115 v CONTROL - 115 v 24x24 in DUCT 24 in dam DUCT THERMOCOUPLES B - B C - C BASE HEATER INSULATION INSULATION CONDITIONED AIR INLET FIGURE 2. Overall view of assembled test apparatus . after an ...
Page 3
... constant at preselected temperature levels in the apparatus . The major increase of the air temperature was obtained from base heaters . Final control was obtained by thermostatic operation of trimmer heaters of smaller capacity . Each ...
... constant at preselected temperature levels in the apparatus . The major increase of the air temperature was obtained from base heaters . Final control was obtained by thermostatic operation of trimmer heaters of smaller capacity . Each ...
Page 7
... constant . FIGURE 8. Effectiveness of the louvered strip mixing device relative to the spacing between mixing elements . ( OVERALL DISTANCE : 4.75 DUCT DIAMETERS ) MEAN AIR. ( % ) 100 96.2 % 90 90.2 % 80 70 EFFECTIVENESS 50 60 50 ...
... constant . FIGURE 8. Effectiveness of the louvered strip mixing device relative to the spacing between mixing elements . ( OVERALL DISTANCE : 4.75 DUCT DIAMETERS ) MEAN AIR. ( % ) 100 96.2 % 90 90.2 % 80 70 EFFECTIVENESS 50 60 50 ...
Page 8
... constant at 2.0 duct diameters . FIGURE 9. Effectiveness of the louvered strip mixing device as the overall distance from the inlet of the mixing device to the downstream measuring station was varied . Measurements were also made to ...
... constant at 2.0 duct diameters . FIGURE 9. Effectiveness of the louvered strip mixing device as the overall distance from the inlet of the mixing device to the downstream measuring station was varied . Measurements were also made to ...
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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