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
... 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 Introduction Apparatus and test procedure ...
... 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 Introduction Apparatus and test procedure ...
Page 2
... MEASURING STATION # B WATER VAPOR INLETS BASE HEATER A 4 TRIMMER HEATER QUADRANTS BEGIN HEE INLET BLOWER کالے O ... downstream of section A - A in figure 1 con- tained electrical resistance heaters in each of the spaces to produce and ...
... MEASURING STATION # B WATER VAPOR INLETS BASE HEATER A 4 TRIMMER HEATER QUADRANTS BEGIN HEE INLET BLOWER کالے O ... downstream of section A - A in figure 1 con- tained electrical resistance heaters in each of the spaces to produce and ...
Page 3
... measurements were made at each of two stations . Measuring station No. 1 ( see fig . 1 ) was located just downstream from the termination of the quadrant partitions , where the nonuniform temperature pattern of the air was measured as ...
... measurements were made at each of two stations . Measuring station No. 1 ( see fig . 1 ) was located just downstream from the termination of the quadrant partitions , where the nonuniform temperature pattern of the air was measured as ...
Page 5
... downstream measur- ing stations . A statistical analysis was made of the temperature values of the two stations . Five sets of temperature measurements were made for each test , and standard deviations of the upstream and downstream ...
... downstream measur- ing stations . A statistical analysis was made of the temperature values of the two stations . Five sets of temperature measurements were made for each test , and standard deviations of the upstream and downstream ...
Page 7
... downstream station was held constant . FIGURE 8. Effectiveness of the ... measuring system . It was also of interest to determine how the magnitude of ... downstream mea- suring station was confined to 4.75 duct dia- meters . Because of ...
... downstream station was held constant . FIGURE 8. Effectiveness of the ... measuring system . It was also of interest to determine how the magnitude of ... downstream mea- suring station was confined to 4.75 duct dia- meters . Because of ...
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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