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 7
Page 3
... common ice reference junction and all switching was accom- plished in the copper portion of the thermo- couple circuit ... normal path . Louvers were designed so that FIGURE 4. A view of the louvered strip mixing device 3 Instrumentation ...
... common ice reference junction and all switching was accom- plished in the copper portion of the thermo- couple circuit ... normal path . Louvers were designed so that FIGURE 4. A view of the louvered strip mixing device 3 Instrumentation ...
Page 4
... normal path . For ex- ample , the air passing through one area was deflected left by the louvers and in the adja- cent area the deflection of the air was to the right . The air streams issuing through adja- cent louvered strips moved in ...
... normal path . For ex- ample , the air passing through one area was deflected left by the louvers and in the adja- cent area the deflection of the air was to the right . The air streams issuing through adja- cent louvered strips moved in ...
Page 8
... normal path of flow along the axis of the duct . Using the quadrant tempera- ture distribution pattern , the effectiveness de- creased from 96 to 93 percent for the respec- tive settings of 60 ° and 45 ° from the normal path of flow ...
... normal path of flow along the axis of the duct . Using the quadrant tempera- ture distribution pattern , the effectiveness de- creased from 96 to 93 percent for the respec- tive settings of 60 ° and 45 ° from the normal path of flow ...
Page 12
... NORMAL PATH OF FLOW FIGURE 17. Relation of the louver angle to effectiveness for the louver - baffle mixing device . LOUVER SETTING FROM NORMAL PATH OF FLOW FIGURE 18. Pressure drop for the louver - baffle mixing device at selected ...
... NORMAL PATH OF FLOW FIGURE 17. Relation of the louver angle to effectiveness for the louver - baffle mixing device . LOUVER SETTING FROM NORMAL PATH OF FLOW FIGURE 18. Pressure drop for the louver - baffle mixing device at selected ...
Page 13
... normal path of flow . At the 60 ° louver angle setting , the pressure drop was determined for a given rate of air flowing through the outer area . Then with the same flow rate , the angular set- ting of the louvers in the two inner ...
... normal path of flow . At the 60 ° louver angle setting , the pressure drop was determined for a given rate of air flowing through the outer area . Then with the same flow rate , the angular set- ting of the louvers in the two inner ...
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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