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
... 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 QUADRANTS END HERE MEASURING STATION 1 ...
... 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 QUADRANTS END HERE MEASURING STATION 1 ...
Page 2
... INLETS BASE HEATER A 4 TRIMMER HEATER QUADRANTS BEGIN HEE INLET BLOWER کالے O STRAIGHTENING TUBES ( IN ALL QUADRANTS ) X MEASURING STATION # 2 EXHAUST BLOWER EXHAUST TO RECONDITIONING ZONE MIXING CHAMBER THERMOCOUPLES B STATIC C ...
... INLETS BASE HEATER A 4 TRIMMER HEATER QUADRANTS BEGIN HEE INLET BLOWER کالے O STRAIGHTENING TUBES ( IN ALL QUADRANTS ) X MEASURING STATION # 2 EXHAUST BLOWER EXHAUST TO RECONDITIONING ZONE MIXING CHAMBER THERMOCOUPLES B STATIC C ...
Page 3
... inlet of the first blower and at the exhaust downstream from the second blower . By pro- per adjustment of these two dampers , the pres- sure inside the apparatus was maintained at a positive level to prevent leakage of uncondi- tioned ...
... inlet of the first blower and at the exhaust downstream from the second blower . By pro- per adjustment of these two dampers , the pres- sure inside the apparatus was maintained at a positive level to prevent leakage of uncondi- tioned ...
Page 6
... Inlet Temp . Temp . Diff . Pattern ' Effectiveness Range Std . * Dev . CFM in . W.G. in . Duct in . Diam . Duct Diam . in . Duct Diam . deg F % % 1 1400 0.07 12 12 0.50 102 4.25 114 4.75 3.6 90.1 92.5 2 1400 0.07 24 1.00 90 3.75 114 ...
... Inlet Temp . Temp . Diff . Pattern ' Effectiveness Range Std . * Dev . CFM in . W.G. in . Duct in . Diam . Duct Diam . in . Duct Diam . deg F % % 1 1400 0.07 12 12 0.50 102 4.25 114 4.75 3.6 90.1 92.5 2 1400 0.07 24 1.00 90 3.75 114 ...
Page 7
... inlet of the mixing device to the downstream station was held 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.
... inlet of the mixing device to the downstream station was held 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.
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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