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
... deg F for the wire used ) with interpolation to 0.1 μV . A zone box [ 3 ] was used in the thermo- couple circuit to permit the use of a common ice reference junction and all switching was accom- plished in the copper portion of the ...
... deg F for the wire used ) with interpolation to 0.1 μV . A zone box [ 3 ] was used in the thermo- couple circuit to permit the use of a common ice reference junction and all switching was accom- plished in the copper portion of the ...
Page 6
... deg F 5/9 deg C 1 inch of water Flow rate = tiveness to some other parameter , the standard deviation method of determining effectiveness was used . Three patterns of temperature nonuniform- ity were used to determine how mixer effec ...
... deg F 5/9 deg C 1 inch of water Flow rate = tiveness to some other parameter , the standard deviation method of determining effectiveness was used . Three patterns of temperature nonuniform- ity were used to determine how mixer effec ...
Page 7
... deg F revealed no change in the percentage effectiveness of the mixer . In studying all other parameters , a temperature difference in the unmixed air stream of ap- proximately 3 to 4 deg F was used for all mix- ers . Using two mixing ...
... deg F revealed no change in the percentage effectiveness of the mixer . In studying all other parameters , a temperature difference in the unmixed air stream of ap- proximately 3 to 4 deg F was used for all mix- ers . Using two mixing ...
Page 8
... deg F level of temperature difference . It is possible that the computed values of effec- tiveness for temperature differences of less than 3 deg F at the mixer inlet ( 0.6 and 1.7 deg F ) could have been influenced by the in- strument ...
... deg F level of temperature difference . It is possible that the computed values of effec- tiveness for temperature differences of less than 3 deg F at the mixer inlet ( 0.6 and 1.7 deg F ) could have been influenced by the in- strument ...
Page 9
... deg F Degree א % % 1 1400 0.71 14 0.58 46 1.92 60 2.50 3.3 2 1400 0.71 18 0.75 42 1.75 60 2.50 3.3 00 60 94.6 95.5 60 95.9 96.7 3 1400 0.71 22 0.92 38 1.58 60 2.50 3.6 60 96.4 97.1 4 1400 0.71 26 1.08 34 1.42 60 2.50 3.5 60 95.4 96.4 2 ...
... deg F Degree א % % 1 1400 0.71 14 0.58 46 1.92 60 2.50 3.3 2 1400 0.71 18 0.75 42 1.75 60 2.50 3.3 00 60 94.6 95.5 60 95.9 96.7 3 1400 0.71 22 0.92 38 1.58 60 2.50 3.6 60 96.4 97.1 4 1400 0.71 26 1.08 34 1.42 60 2.50 3.5 60 95.4 96.4 2 ...
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...