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
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Page 4
... placed in series for this study . The first mixer provided shearing action in the hori- zontal plane . The second , rotated 90 ° in res- pect to the first mixer and located downstream , provided shearing action in the vertical plane ...
... placed in series for this study . The first mixer provided shearing action in the hori- zontal plane . The second , rotated 90 ° in res- pect to the first mixer and located downstream , provided shearing action in the vertical plane ...
Page 8
... placed with 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 ...
... placed with 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 ...
Page 14
... placed approximately two duct diameters apart , but that very little mixing would be lost by reducing the spacing down to one duct diameter . Tests using a spacing of two duct di- ameters between mixing elements showed that the overall ...
... placed approximately two duct diameters apart , but that very little mixing would be lost by reducing the spacing down to one duct diameter . Tests using a spacing of two duct di- ameters between mixing elements showed that the overall ...
Page 15
... placed there existed a flow of air in which temperature fluctuations were very small . Error of measurement for temperature sensors of thermocouples , a thermistor and a resistance thermometer , due to the radiation from the heated ...
... placed there existed a flow of air in which temperature fluctuations were very small . Error of measurement for temperature sensors of thermocouples , a thermistor and a resistance thermometer , due to the radiation from the heated ...
Page 17
... placed in se- ries approximately one duct diameter apart in such a way that one - half of the area of the round duct was blocked off by the first baffle . One duct diameter downstream , the second baf- fle was placed in a position ...
... placed in se- ries approximately one duct diameter apart in such a way that one - half of the area of the round duct was blocked off by the first baffle . One duct diameter downstream , the second baf- fle was placed in a position ...
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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