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
Results 1-5 of 7
Page 2
... passed through the mixing de- vice and along the duct to a second measuring station . The second station could be reposi- tioned along the length of the duct to deter- mine the uniformity of the air stream at dif- ferent locations ...
... passed through the mixing de- vice and along the duct to a second measuring station . The second station could be reposi- tioned along the length of the duct to deter- mine the uniformity of the air stream at dif- ferent locations ...
Page 3
... passing through the mixing device . The second measuring station was used to make measure- ments of the temperature distribution at se- lected points along the duct length as the mix- ing progressed . Both stations were constructed ...
... passing through the mixing device . The second measuring station was used to make measure- ments of the temperature distribution at se- lected points along the duct length as the mix- ing progressed . Both stations were constructed ...
Page 4
... passing through any two adjacent lou- vered areas was deflected through equal and opposing angles from its normal path . For ex- ample , the air passing through one area was deflected left by the louvers and in the adja- cent area the ...
... passing through any two adjacent lou- vered areas was deflected through equal and opposing angles from its normal path . For ex- ample , the air passing through one area was deflected left by the louvers and in the adja- cent area the ...
Page 10
... passed through the mixer . From the data shown in figure 14 , it was found that a distance of 0.92 duct diameter between ele- ments provided sufficient spacing to accomplish good mixing . With the elements located 0.92 duct diameter ...
... passed through the mixer . From the data shown in figure 14 , it was found that a distance of 0.92 duct diameter between ele- ments provided sufficient spacing to accomplish good mixing . With the elements located 0.92 duct diameter ...
Page 12
... passed through the mixer . Tests were made at various louver angle positions from 0 ° , or along the axis of the duct , to 65 ° from the axis . As shown in figure 17 , the observed effectiveness was maximum at a setting of 60 ° . Beyond ...
... passed through the mixer . Tests were made at various louver angle positions from 0 ° , or along the axis of the duct , to 65 ° from the axis . As shown in figure 17 , the observed effectiveness was maximum at a setting of 60 ° . Beyond ...
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.
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...