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 5
... mixing element . Through the shearing movement of the rotat- ing air streams ... Distance between mixing elements 4. Overall distance required for mixing 5 ... between streams of different temper- ature air . 4.1 . Louvered Strip Table 1 ...
... mixing element . Through the shearing movement of the rotat- ing air streams ... Distance between mixing elements 4. Overall distance required for mixing 5 ... between streams of different temper- ature air . 4.1 . Louvered Strip Table 1 ...
Page 6
... Distance from 2nd Element to Down- stream Meas . Station * Shaded area represents a temperature different from the ... BETWEEN MIXING ELEMENTS The overall distance of 4.75 duct. Test Flow No. Rate Pressure Drop Across Mixer Distance Between ...
... Distance from 2nd Element to Down- stream Meas . Station * Shaded area represents a temperature different from the ... BETWEEN MIXING ELEMENTS The overall distance of 4.75 duct. Test Flow No. Rate Pressure Drop Across Mixer Distance Between ...
Page 7
T. K. Faison, Joseph C. Davis, Paul R. Achenbach. DISTANCE BETWEEN MIXING ELEMENTS The overall distance of 4.75 duct diameters from the inlet of the mixing device to the downstream station was held constant . FIGURE 8. Effectiveness of ...
T. K. Faison, Joseph C. Davis, Paul R. Achenbach. DISTANCE BETWEEN MIXING ELEMENTS The overall distance of 4.75 duct diameters from the inlet of the mixing device to the downstream station was held constant . FIGURE 8. Effectiveness of ...
Page 8
T. K. Faison, Joseph C. Davis, Paul R. Achenbach. ( OVERALL DISTANCE : 4.75 DUCT DIAMETERS ) MEAN AIR STREAM VELOCITY IN THE TWO FOOT DIAMETER DUCT ( FPM ) FIGURE 10. Relation of mixer inlet velocity to effectiveness for the louvered strip ...
T. K. Faison, Joseph C. Davis, Paul R. Achenbach. ( OVERALL DISTANCE : 4.75 DUCT DIAMETERS ) MEAN AIR STREAM VELOCITY IN THE TWO FOOT DIAMETER DUCT ( FPM ) FIGURE 10. Relation of mixer inlet velocity to effectiveness for the louvered strip ...
Page 9
... of test conditions and performance of the louver - baffle mixer . Test Flow No. Rate Pressure Drop Across Mixer Distance from 2nd Distance Between Mixing Elements Element to Down- stream Meas . Station Overall Distance Temperature ...
... of test conditions and performance of the louver - baffle mixer . Test Flow No. Rate Pressure Drop Across Mixer Distance from 2nd Distance Between Mixing Elements Element to Down- stream Meas . Station Overall Distance Temperature ...
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...