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 18
Page 1
... air flow through the mixers , expressed as multiples of the velocity head of the entering air , were approximately 7 , 5 , and 38 for the louvered strip , concentric louver , and louver - baffle mixers , respectively . Key words ...
... air flow through the mixers , expressed as multiples of the velocity head of the entering air , were approximately 7 , 5 , and 38 for the louvered strip , concentric louver , and louver - baffle mixers , respectively . Key words ...
Page 2
... air stream at dif- ferent locations downstream from the mixing device . The air was then passed from the appa- ratus through the exhaust blower . The two blowers , the supply and exhaust , were dam- pered to control both the flow rate ...
... air stream at dif- ferent locations downstream from the mixing device . The air was then passed from the appa- ratus through the exhaust blower . The two blowers , the supply and exhaust , were dam- pered to control both the flow rate ...
Page 3
... AIR STREAM AT DIFFERENT TEMPERATURES FIGURE 3. Patterns of temperature ... air was measured as it existed prior to passing through the mixing device . The second ... flow rate in the test apparatus was con- trolled by varying adjustable ...
... AIR STREAM AT DIFFERENT TEMPERATURES FIGURE 3. Patterns of temperature ... air was measured as it existed prior to passing through the mixing device . The second ... flow rate in the test apparatus was con- trolled by varying adjustable ...
Page 4
... air passing through any two adjacent lou- vered areas was deflected through equal and opposing angles from its normal path . For ex- ample , the air ... flow caused the forma- tion of a highly turbulent field downstream from the mixing device ...
... air passing through any two adjacent lou- vered areas was deflected through equal and opposing angles from its normal path . For ex- ample , the air ... flow caused the forma- tion of a highly turbulent field downstream from the mixing device ...
Page 5
... air in a clockwise or counter- clockwise direction . Because of counterrotation of the adjacent annular air streams ... flow rate 6. Deflection angle . In each test , temperature values were re- corded for each of the 24 thermocouple ...
... air in a clockwise or counter- clockwise direction . Because of counterrotation of the adjacent annular air streams ... flow rate 6. Deflection angle . In each test , temperature values were re- corded for each of the 24 thermocouple ...
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...