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 1-4 of 4
Page 7
... respect to each other for best mixing . Tests were made to de- termine the optimum placement by varying the location of the second element with respect to the first element . Figure 8 shows a curve of ef- fectiveness as the distance ...
... respect to each other for best mixing . Tests were made to de- termine the optimum placement by varying the location of the second element with respect to the first element . Figure 8 shows a curve of ef- fectiveness as the distance ...
Page 8
... respect to each other and at what overall length the mixer would be highly effective ( 97 % or higher ) . Figures 14 and 15 , respec- tively , show the effect when the distance be- tween elements is varied , and the effectiveness ...
... respect to each other and at what overall length the mixer would be highly effective ( 97 % or higher ) . Figures 14 and 15 , respec- tively , show the effect when the distance be- tween elements is varied , and the effectiveness ...
Page 14
... respect to each other , the mixing elements would best perform . For this determination , the down- stream measuring station was held in a fixed position and the location of the second mixing element with respect to the first was varied ...
... respect to each other , the mixing elements would best perform . For this determination , the down- stream measuring station was held in a fixed position and the location of the second mixing element with respect to the first was varied ...
Page 17
... respect to mix- ing . ( Velocity profiles taken before and after a number of layers of screen showed a distinct improvement in the uniformity of the velocity within the cross - sectional plane of the duct . ) It should be mentioned that ...
... respect to mix- ing . ( Velocity profiles taken before and after a number of layers of screen showed a distinct improvement in the uniformity of the velocity within the cross - sectional plane of the duct . ) It should be mentioned that ...
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
Popular passages
Page 1 - A schematic of the apparatus is shown in figure 1. Figure 2 is a photograph of the apparatus.
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