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 3
... temperature distribution within the cross section of the test stream . 3 ... difference being that the upstream station was stationary and the down ... temperature water . The dif- ference between any two of the 24 thermocou- ples was ...
... temperature distribution within the cross section of the test stream . 3 ... difference being that the upstream station was stationary and the down ... temperature water . The dif- ference between any two of the 24 thermocou- ples was ...
Page 6
... Drop Across Mixer Distance Between Mixing Elements Overall Distance Temperature Conditions at Mixer Inlet Temp . Temp . Diff . Pattern ' Effectiveness Range Std . * Dev . CFM in . W.G. in . Duct in . Diam . Duct Diam . in . Duct Diam ...
... Drop Across Mixer Distance Between Mixing Elements Overall Distance Temperature Conditions at Mixer Inlet Temp . Temp . Diff . Pattern ' Effectiveness Range Std . * Dev . CFM in . W.G. in . Duct in . Diam . Duct Diam . in . Duct Diam ...
Page 7
... TEMPERATURE PATTERNS 99.0 % ( T and represent areas at different temperatures ) FIGURE 7. Effectiveness of the ... difference might affect the value of effectiveness . Tests using the concentric temperature pattern were made by varying ...
... TEMPERATURE PATTERNS 99.0 % ( T and represent areas at different temperatures ) FIGURE 7. Effectiveness of the ... difference might affect the value of effectiveness . Tests using the concentric temperature pattern were made by varying ...
Page 8
... TEMPERATURE PATTERN A QUADRANT TEMPERATURE PATTERN ( THREE QUADRANTS WARM AND ONE QUADRANT COOL ) MEAN VELOCITY ... difference . It is possible that the computed values of effec- tiveness for temperature differences of less than 3 deg F ...
... TEMPERATURE PATTERN A QUADRANT TEMPERATURE PATTERN ( THREE QUADRANTS WARM AND ONE QUADRANT COOL ) MEAN VELOCITY ... difference . It is possible that the computed values of effec- tiveness for temperature differences of less than 3 deg F ...
Page 9
... Drop Across Mixer Distance from 2nd Distance Between Mixing Elements Element to Down- stream Meas . Station Overall Distance Temperature Conditions at Mixer Inlet Temp . Temp . Louver Angle Effectivenss Diff . Pattern * Range Std . Dev ...
... Drop Across Mixer Distance from 2nd Distance Between Mixing Elements Element to Down- stream Meas . Station Overall Distance Temperature Conditions at Mixer Inlet Temp . Temp . Louver Angle Effectivenss Diff . Pattern * Range Std . Dev ...
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.
Page 20 - Announcement of New Publications in Building Science Series Superintendent of Documents, US Government Printing Office, Washington, DC 20402 Dear Sir: Please add my name to the announcement list of new publications to be issued in the series : National Bureau of Standards Building Science Series. Name Company Address City State Zip Code (Notification key N-339...